diff --git a/opentelemetry-proto/src/transform/metrics.rs b/opentelemetry-proto/src/transform/metrics.rs
index 15d97a2db..04a1fe18f 100644
--- a/opentelemetry-proto/src/transform/metrics.rs
+++ b/opentelemetry-proto/src/transform/metrics.rs
@@ -295,8 +295,8 @@ pub mod tonic {
                     .iter()
                     .map(|dp| TonicNumberDataPoint {
                         attributes: dp.attributes.iter().map(Into::into).collect(),
-                        start_time_unix_nano: to_nanos(dp.start_time),
-                        time_unix_nano: to_nanos(dp.time),
+                        start_time_unix_nano: to_nanos(sum.start_time),
+                        time_unix_nano: to_nanos(sum.time),
                         exemplars: dp.exemplars.iter().map(Into::into).collect(),
                         flags: TonicDataPointFlags::default() as u32,
                         value: Some(dp.value.into()),
@@ -319,8 +319,8 @@ pub mod tonic {
                     .iter()
                     .map(|dp| TonicNumberDataPoint {
                         attributes: dp.attributes.iter().map(Into::into).collect(),
-                        start_time_unix_nano: dp.start_time.map(to_nanos).unwrap_or_default(),
-                        time_unix_nano: to_nanos(dp.time),
+                        start_time_unix_nano: gauge.start_time.map(to_nanos).unwrap_or_default(),
+                        time_unix_nano: to_nanos(gauge.time),
                         exemplars: dp.exemplars.iter().map(Into::into).collect(),
                         flags: TonicDataPointFlags::default() as u32,
                         value: Some(dp.value.into()),
diff --git a/opentelemetry-sdk/src/metrics/data/mod.rs b/opentelemetry-sdk/src/metrics/data/mod.rs
index 759049393..9c1516d8b 100644
--- a/opentelemetry-sdk/src/metrics/data/mod.rs
+++ b/opentelemetry-sdk/src/metrics/data/mod.rs
@@ -59,10 +59,6 @@ pub struct GaugeDataPoint<T> {
     /// Attributes is the set of key value pairs that uniquely identify the
     /// time series.
     pub attributes: Vec<KeyValue>,
-    /// The time when the time series was started.
-    pub start_time: Option<SystemTime>,
-    /// The time when the time series was recorded.
-    pub time: SystemTime,
     /// The value of this data point.
     pub value: T,
     /// The sampled [Exemplar]s collected during the time series.
@@ -73,8 +69,6 @@ impl<T: Copy> Clone for GaugeDataPoint<T> {
     fn clone(&self) -> Self {
         Self {
             attributes: self.attributes.clone(),
-            start_time: self.start_time,
-            time: self.time,
             value: self.value,
             exemplars: self.exemplars.clone(),
         }
@@ -86,6 +80,10 @@ impl<T: Copy> Clone for GaugeDataPoint<T> {
 pub struct Gauge<T> {
     /// Represents individual aggregated measurements with unique attributes.
     pub data_points: Vec<GaugeDataPoint<T>>,
+    /// The time when the time series was started.
+    pub start_time: Option<SystemTime>,
+    /// The time when the time series was recorded.
+    pub time: SystemTime,
 }
 
 impl<T: fmt::Debug + Send + Sync + 'static> Aggregation for Gauge<T> {
@@ -103,10 +101,6 @@ pub struct SumDataPoint<T> {
     /// Attributes is the set of key value pairs that uniquely identify the
     /// time series.
     pub attributes: Vec<KeyValue>,
-    /// The time when the time series was started.
-    pub start_time: SystemTime,
-    /// The time when the time series was recorded.
-    pub time: SystemTime,
     /// The value of this data point.
     pub value: T,
     /// The sampled [Exemplar]s collected during the time series.
@@ -117,8 +111,6 @@ impl<T: Copy> Clone for SumDataPoint<T> {
     fn clone(&self) -> Self {
         Self {
             attributes: self.attributes.clone(),
-            start_time: self.start_time,
-            time: self.time,
             value: self.value,
             exemplars: self.exemplars.clone(),
         }
@@ -130,6 +122,10 @@ impl<T: Copy> Clone for SumDataPoint<T> {
 pub struct Sum<T> {
     /// Represents individual aggregated measurements with unique attributes.
     pub data_points: Vec<SumDataPoint<T>>,
+    /// The time when the time series was started.
+    pub start_time: SystemTime,
+    /// The time when the time series was recorded.
+    pub time: SystemTime,
     /// Describes if the aggregation is reported as the change from the last report
     /// time, or the cumulative changes since a fixed start time.
     pub temporality: Temporality,
@@ -366,8 +362,6 @@ mod tests {
     fn validate_cloning_data_points() {
         let data_type = SumDataPoint {
             attributes: vec![KeyValue::new("key", "value")],
-            start_time: std::time::SystemTime::now(),
-            time: std::time::SystemTime::now(),
             value: 0u32,
             exemplars: vec![Exemplar {
                 filtered_attributes: vec![],
diff --git a/opentelemetry-sdk/src/metrics/internal/aggregate.rs b/opentelemetry-sdk/src/metrics/internal/aggregate.rs
index 3c78682dc..71befc8d6 100644
--- a/opentelemetry-sdk/src/metrics/internal/aggregate.rs
+++ b/opentelemetry-sdk/src/metrics/internal/aggregate.rs
@@ -2,10 +2,7 @@ use std::{marker, sync::Arc};
 
 use opentelemetry::KeyValue;
 
-use crate::metrics::{
-    data::{Aggregation, Gauge},
-    Temporality,
-};
+use crate::metrics::{data::Aggregation, Temporality};
 
 use super::{
     exponential_histogram::ExpoHistogram, histogram::Histogram, last_value::LastValue,
@@ -99,31 +96,15 @@ impl<T: Number> AggregateBuilder<T> {
 
     /// Builds a last-value aggregate function input and output.
     pub(crate) fn last_value(&self) -> (impl Measure<T>, impl ComputeAggregation) {
-        let lv_filter = Arc::new(LastValue::new());
-        let lv_agg = Arc::clone(&lv_filter);
+        let lv = Arc::new(LastValue::new());
+        let agg_lv = Arc::clone(&lv);
         let t = self.temporality;
 
         (
-            self.filter(move |n, a: &[KeyValue]| lv_filter.measure(n, a)),
-            move |dest: Option<&mut dyn Aggregation>| {
-                let g = dest.and_then(|d| d.as_mut().downcast_mut::<Gauge<T>>());
-                let mut new_agg = if g.is_none() {
-                    Some(Gauge {
-                        data_points: vec![],
-                    })
-                } else {
-                    None
-                };
-                let g = g.unwrap_or_else(|| new_agg.as_mut().expect("present if g is none"));
-
-                match t {
-                    Some(Temporality::Delta) => {
-                        lv_agg.compute_aggregation_delta(&mut g.data_points)
-                    }
-                    _ => lv_agg.compute_aggregation_cumulative(&mut g.data_points),
-                }
-
-                (g.data_points.len(), new_agg.map(|a| Box::new(a) as Box<_>))
+            self.filter(move |n, a: &[KeyValue]| lv.measure(n, a)),
+            move |dest: Option<&mut dyn Aggregation>| match t {
+                Some(Temporality::Delta) => agg_lv.delta(dest),
+                _ => agg_lv.cumulative(dest),
             },
         )
     }
@@ -211,8 +192,8 @@ impl<T: Number> AggregateBuilder<T> {
 #[cfg(test)]
 mod tests {
     use crate::metrics::data::{
-        ExponentialBucket, ExponentialHistogram, ExponentialHistogramDataPoint, GaugeDataPoint,
-        Histogram, HistogramDataPoint, Sum, SumDataPoint,
+        ExponentialBucket, ExponentialHistogram, ExponentialHistogramDataPoint, Gauge,
+        GaugeDataPoint, Histogram, HistogramDataPoint, Sum, SumDataPoint,
     };
     use std::{time::SystemTime, vec};
 
@@ -224,11 +205,11 @@ mod tests {
         let mut a = Gauge {
             data_points: vec![GaugeDataPoint {
                 attributes: vec![KeyValue::new("a", 1)],
-                start_time: Some(SystemTime::now()),
-                time: SystemTime::now(),
                 value: 1u64,
                 exemplars: vec![],
             }],
+            start_time: Some(SystemTime::now()),
+            time: SystemTime::now(),
         };
         let new_attributes = [KeyValue::new("b", 2)];
         measure.call(2, &new_attributes[..]);
@@ -251,19 +232,17 @@ mod tests {
                 data_points: vec![
                     SumDataPoint {
                         attributes: vec![KeyValue::new("a1", 1)],
-                        start_time: SystemTime::now(),
-                        time: SystemTime::now(),
                         value: 1u64,
                         exemplars: vec![],
                     },
                     SumDataPoint {
                         attributes: vec![KeyValue::new("a2", 1)],
-                        start_time: SystemTime::now(),
-                        time: SystemTime::now(),
                         value: 2u64,
                         exemplars: vec![],
                     },
                 ],
+                start_time: SystemTime::now(),
+                time: SystemTime::now(),
                 temporality: if temporality == Temporality::Delta {
                     Temporality::Cumulative
                 } else {
@@ -294,19 +273,17 @@ mod tests {
                 data_points: vec![
                     SumDataPoint {
                         attributes: vec![KeyValue::new("a1", 1)],
-                        start_time: SystemTime::now(),
-                        time: SystemTime::now(),
                         value: 1u64,
                         exemplars: vec![],
                     },
                     SumDataPoint {
                         attributes: vec![KeyValue::new("a2", 1)],
-                        start_time: SystemTime::now(),
-                        time: SystemTime::now(),
                         value: 2u64,
                         exemplars: vec![],
                     },
                 ],
+                start_time: SystemTime::now(),
+                time: SystemTime::now(),
                 temporality: if temporality == Temporality::Delta {
                     Temporality::Cumulative
                 } else {
diff --git a/opentelemetry-sdk/src/metrics/internal/exponential_histogram.rs b/opentelemetry-sdk/src/metrics/internal/exponential_histogram.rs
index 4760a8a55..af89dc227 100644
--- a/opentelemetry-sdk/src/metrics/internal/exponential_histogram.rs
+++ b/opentelemetry-sdk/src/metrics/internal/exponential_histogram.rs
@@ -1440,7 +1440,7 @@ mod tests {
                 count = out_fn.call(Some(got.as_mut())).0
             }
 
-            assert_aggregation_eq::<T>(Box::new(test.want), got, true, test.name);
+            assert_aggregation_eq::<T>(Box::new(test.want), got, test.name);
             assert_eq!(test.want_count, count, "{}", test.name);
         }
     }
@@ -1448,7 +1448,6 @@ mod tests {
     fn assert_aggregation_eq<T: Number + PartialEq>(
         a: Box<dyn Aggregation>,
         b: Box<dyn Aggregation>,
-        ignore_timestamp: bool,
         test_name: &'static str,
     ) {
         assert_eq!(
@@ -1467,13 +1466,7 @@ mod tests {
                 test_name
             );
             for (a, b) in a.data_points.iter().zip(b.data_points.iter()) {
-                assert_gauge_data_points_eq(
-                    a,
-                    b,
-                    ignore_timestamp,
-                    "mismatching gauge data points",
-                    test_name,
-                );
+                assert_gauge_data_points_eq(a, b, "mismatching gauge data points", test_name);
             }
         } else if let Some(a) = a.as_any().downcast_ref::<data::Sum<T>>() {
             let b = b.as_any().downcast_ref::<data::Sum<T>>().unwrap();
@@ -1494,13 +1487,7 @@ mod tests {
                 test_name
             );
             for (a, b) in a.data_points.iter().zip(b.data_points.iter()) {
-                assert_sum_data_points_eq(
-                    a,
-                    b,
-                    ignore_timestamp,
-                    "mismatching sum data points",
-                    test_name,
-                );
+                assert_sum_data_points_eq(a, b, "mismatching sum data points", test_name);
             }
         } else if let Some(a) = a.as_any().downcast_ref::<data::Histogram<T>>() {
             let b = b.as_any().downcast_ref::<data::Histogram<T>>().unwrap();
@@ -1516,13 +1503,7 @@ mod tests {
                 test_name
             );
             for (a, b) in a.data_points.iter().zip(b.data_points.iter()) {
-                assert_hist_data_points_eq(
-                    a,
-                    b,
-                    ignore_timestamp,
-                    "mismatching hist data points",
-                    test_name,
-                );
+                assert_hist_data_points_eq(a, b, "mismatching hist data points", test_name);
             }
         } else if let Some(a) = a.as_any().downcast_ref::<data::ExponentialHistogram<T>>() {
             let b = b
@@ -1544,7 +1525,6 @@ mod tests {
                 assert_exponential_hist_data_points_eq(
                     a,
                     b,
-                    ignore_timestamp,
                     "mismatching hist data points",
                     test_name,
                 );
@@ -1557,7 +1537,6 @@ mod tests {
     fn assert_sum_data_points_eq<T: Number>(
         a: &data::SumDataPoint<T>,
         b: &data::SumDataPoint<T>,
-        ignore_timestamp: bool,
         message: &'static str,
         test_name: &'static str,
     ) {
@@ -1567,21 +1546,11 @@ mod tests {
             test_name, message
         );
         assert_eq!(a.value, b.value, "{}: {} value", test_name, message);
-
-        if !ignore_timestamp {
-            assert_eq!(
-                a.start_time, b.start_time,
-                "{}: {} start time",
-                test_name, message
-            );
-            assert_eq!(a.time, b.time, "{}: {} time", test_name, message);
-        }
     }
 
     fn assert_gauge_data_points_eq<T: Number>(
         a: &data::GaugeDataPoint<T>,
         b: &data::GaugeDataPoint<T>,
-        ignore_timestamp: bool,
         message: &'static str,
         test_name: &'static str,
     ) {
@@ -1591,21 +1560,11 @@ mod tests {
             test_name, message
         );
         assert_eq!(a.value, b.value, "{}: {} value", test_name, message);
-
-        if !ignore_timestamp {
-            assert_eq!(
-                a.start_time, b.start_time,
-                "{}: {} start time",
-                test_name, message
-            );
-            assert_eq!(a.time, b.time, "{}: {} time", test_name, message);
-        }
     }
 
     fn assert_hist_data_points_eq<T: Number>(
         a: &data::HistogramDataPoint<T>,
         b: &data::HistogramDataPoint<T>,
-        ignore_timestamp: bool,
         message: &'static str,
         test_name: &'static str,
     ) {
@@ -1624,21 +1583,11 @@ mod tests {
         assert_eq!(a.min, b.min, "{}: {} min", test_name, message);
         assert_eq!(a.max, b.max, "{}: {} max", test_name, message);
         assert_eq!(a.sum, b.sum, "{}: {} sum", test_name, message);
-
-        if !ignore_timestamp {
-            assert_eq!(
-                a.start_time, b.start_time,
-                "{}: {} start time",
-                test_name, message
-            );
-            assert_eq!(a.time, b.time, "{}: {} time", test_name, message);
-        }
     }
 
     fn assert_exponential_hist_data_points_eq<T: Number>(
         a: &data::ExponentialHistogramDataPoint<T>,
         b: &data::ExponentialHistogramDataPoint<T>,
-        ignore_timestamp: bool,
         message: &'static str,
         test_name: &'static str,
     ) {
@@ -1669,14 +1618,5 @@ mod tests {
             "{}: {} neg",
             test_name, message
         );
-
-        if !ignore_timestamp {
-            assert_eq!(
-                a.start_time, b.start_time,
-                "{}: {} start time",
-                test_name, message
-            );
-            assert_eq!(a.time, b.time, "{}: {} time", test_name, message);
-        }
     }
 }
diff --git a/opentelemetry-sdk/src/metrics/internal/last_value.rs b/opentelemetry-sdk/src/metrics/internal/last_value.rs
index b611be71f..44b7b2339 100644
--- a/opentelemetry-sdk/src/metrics/internal/last_value.rs
+++ b/opentelemetry-sdk/src/metrics/internal/last_value.rs
@@ -1,6 +1,6 @@
 use std::{mem::replace, ops::DerefMut, sync::Mutex, time::SystemTime};
 
-use crate::metrics::data::GaugeDataPoint;
+use crate::metrics::data::{self, Aggregation, GaugeDataPoint};
 use opentelemetry::KeyValue;
 
 use super::{Aggregator, AtomicTracker, AtomicallyUpdate, Number, ValueMap};
@@ -56,33 +56,75 @@ impl<T: Number> LastValue<T> {
         self.value_map.measure(measurement, attrs);
     }
 
-    pub(crate) fn compute_aggregation_delta(&self, dest: &mut Vec<GaugeDataPoint<T>>) {
-        let t = SystemTime::now();
-        let prev_start = self
+    pub(crate) fn delta(
+        &self,
+        dest: Option<&mut dyn Aggregation>,
+    ) -> (usize, Option<Box<dyn Aggregation>>) {
+        let time = SystemTime::now();
+        let start_time = self
             .start
             .lock()
-            .map(|mut start| replace(start.deref_mut(), t))
-            .unwrap_or(t);
+            .map(|mut start| replace(start.deref_mut(), time))
+            .unwrap_or(time);
+
+        let s_data = dest.and_then(|d| d.as_mut().downcast_mut::<data::Gauge<T>>());
+        let mut new_agg = if s_data.is_none() {
+            Some(data::Gauge {
+                data_points: vec![],
+                start_time: Some(start_time),
+                time,
+            })
+        } else {
+            None
+        };
+        let s_data = s_data.unwrap_or_else(|| new_agg.as_mut().expect("present if s_data is none"));
+        s_data.start_time = Some(start_time);
+        s_data.time = time;
+
         self.value_map
-            .collect_and_reset(dest, |attributes, aggr| GaugeDataPoint {
+            .collect_and_reset(&mut s_data.data_points, |attributes, aggr| GaugeDataPoint {
                 attributes,
-                start_time: Some(prev_start),
-                time: t,
                 value: aggr.value.get_value(),
                 exemplars: vec![],
             });
+
+        (
+            s_data.data_points.len(),
+            new_agg.map(|a| Box::new(a) as Box<_>),
+        )
     }
 
-    pub(crate) fn compute_aggregation_cumulative(&self, dest: &mut Vec<GaugeDataPoint<T>>) {
-        let t = SystemTime::now();
-        let prev_start = self.start.lock().map(|start| *start).unwrap_or(t);
+    pub(crate) fn cumulative(
+        &self,
+        dest: Option<&mut dyn Aggregation>,
+    ) -> (usize, Option<Box<dyn Aggregation>>) {
+        let time = SystemTime::now();
+        let start_time = self.start.lock().map(|start| *start).unwrap_or(time);
+        let s_data = dest.and_then(|d| d.as_mut().downcast_mut::<data::Gauge<T>>());
+        let mut new_agg = if s_data.is_none() {
+            Some(data::Gauge {
+                data_points: vec![],
+                start_time: Some(start_time),
+                time,
+            })
+        } else {
+            None
+        };
+        let s_data = s_data.unwrap_or_else(|| new_agg.as_mut().expect("present if s_data is none"));
+
+        s_data.start_time = Some(start_time);
+        s_data.time = time;
+
         self.value_map
-            .collect_readonly(dest, |attributes, aggr| GaugeDataPoint {
+            .collect_readonly(&mut s_data.data_points, |attributes, aggr| GaugeDataPoint {
                 attributes,
-                start_time: Some(prev_start),
-                time: t,
                 value: aggr.value.get_value(),
                 exemplars: vec![],
             });
+
+        (
+            s_data.data_points.len(),
+            new_agg.map(|a| Box::new(a) as Box<_>),
+        )
     }
 }
diff --git a/opentelemetry-sdk/src/metrics/internal/precomputed_sum.rs b/opentelemetry-sdk/src/metrics/internal/precomputed_sum.rs
index a8b04b85c..a37bfdd25 100644
--- a/opentelemetry-sdk/src/metrics/internal/precomputed_sum.rs
+++ b/opentelemetry-sdk/src/metrics/internal/precomputed_sum.rs
@@ -33,12 +33,19 @@ impl<T: Number> PrecomputedSum<T> {
         &self,
         dest: Option<&mut dyn Aggregation>,
     ) -> (usize, Option<Box<dyn Aggregation>>) {
-        let t = SystemTime::now();
+        let time = SystemTime::now();
+        let start_time = self
+            .start
+            .lock()
+            .map(|mut start| replace(start.deref_mut(), time))
+            .unwrap_or(time);
 
         let s_data = dest.and_then(|d| d.as_mut().downcast_mut::<data::Sum<T>>());
         let mut new_agg = if s_data.is_none() {
             Some(data::Sum {
                 data_points: vec![],
+                start_time,
+                time,
                 temporality: Temporality::Delta,
                 is_monotonic: self.monotonic,
             })
@@ -46,15 +53,11 @@ impl<T: Number> PrecomputedSum<T> {
             None
         };
         let s_data = s_data.unwrap_or_else(|| new_agg.as_mut().expect("present if s_data is none"));
+        s_data.start_time = start_time;
+        s_data.time = time;
         s_data.temporality = Temporality::Delta;
         s_data.is_monotonic = self.monotonic;
 
-        let prev_start = self
-            .start
-            .lock()
-            .map(|mut start| replace(start.deref_mut(), t))
-            .unwrap_or(t);
-
         let mut reported = match self.reported.lock() {
             Ok(r) => r,
             Err(_) => return (0, None),
@@ -68,8 +71,6 @@ impl<T: Number> PrecomputedSum<T> {
                 let delta = value - *reported.get(&attributes).unwrap_or(&T::default());
                 SumDataPoint {
                     attributes,
-                    start_time: prev_start,
-                    time: t,
                     value: delta,
                     exemplars: vec![],
                 }
@@ -88,12 +89,15 @@ impl<T: Number> PrecomputedSum<T> {
         &self,
         dest: Option<&mut dyn Aggregation>,
     ) -> (usize, Option<Box<dyn Aggregation>>) {
-        let t = SystemTime::now();
+        let time = SystemTime::now();
+        let start_time = self.start.lock().map(|start| *start).unwrap_or(time);
 
         let s_data = dest.and_then(|d| d.as_mut().downcast_mut::<data::Sum<T>>());
         let mut new_agg = if s_data.is_none() {
             Some(data::Sum {
                 data_points: vec![],
+                start_time,
+                time,
                 temporality: Temporality::Cumulative,
                 is_monotonic: self.monotonic,
             })
@@ -101,16 +105,14 @@ impl<T: Number> PrecomputedSum<T> {
             None
         };
         let s_data = s_data.unwrap_or_else(|| new_agg.as_mut().expect("present if s_data is none"));
+        s_data.start_time = start_time;
+        s_data.time = time;
         s_data.temporality = Temporality::Cumulative;
         s_data.is_monotonic = self.monotonic;
 
-        let prev_start = self.start.lock().map(|start| *start).unwrap_or(t);
-
         self.value_map
             .collect_readonly(&mut s_data.data_points, |attributes, aggr| SumDataPoint {
                 attributes,
-                start_time: prev_start,
-                time: t,
                 value: aggr.value.get_value(),
                 exemplars: vec![],
             });
diff --git a/opentelemetry-sdk/src/metrics/internal/sum.rs b/opentelemetry-sdk/src/metrics/internal/sum.rs
index eec8f746b..7666b6e44 100644
--- a/opentelemetry-sdk/src/metrics/internal/sum.rs
+++ b/opentelemetry-sdk/src/metrics/internal/sum.rs
@@ -71,12 +71,19 @@ impl<T: Number> Sum<T> {
         &self,
         dest: Option<&mut dyn Aggregation>,
     ) -> (usize, Option<Box<dyn Aggregation>>) {
-        let t = SystemTime::now();
+        let time = SystemTime::now();
+        let start_time = self
+            .start
+            .lock()
+            .map(|mut start| replace(start.deref_mut(), time))
+            .unwrap_or(time);
 
         let s_data = dest.and_then(|d| d.as_mut().downcast_mut::<data::Sum<T>>());
         let mut new_agg = if s_data.is_none() {
             Some(data::Sum {
                 data_points: vec![],
+                start_time,
+                time,
                 temporality: Temporality::Delta,
                 is_monotonic: self.monotonic,
             })
@@ -84,19 +91,14 @@ impl<T: Number> Sum<T> {
             None
         };
         let s_data = s_data.unwrap_or_else(|| new_agg.as_mut().expect("present if s_data is none"));
+        s_data.start_time = start_time;
+        s_data.time = time;
         s_data.temporality = Temporality::Delta;
         s_data.is_monotonic = self.monotonic;
 
-        let prev_start = self
-            .start
-            .lock()
-            .map(|mut start| replace(start.deref_mut(), t))
-            .unwrap_or(t);
         self.value_map
             .collect_and_reset(&mut s_data.data_points, |attributes, aggr| SumDataPoint {
                 attributes,
-                start_time: prev_start,
-                time: t,
                 value: aggr.value.get_value(),
                 exemplars: vec![],
             });
@@ -111,12 +113,14 @@ impl<T: Number> Sum<T> {
         &self,
         dest: Option<&mut dyn Aggregation>,
     ) -> (usize, Option<Box<dyn Aggregation>>) {
-        let t = SystemTime::now();
-
+        let time = SystemTime::now();
+        let start_time = self.start.lock().map(|start| *start).unwrap_or(time);
         let s_data = dest.and_then(|d| d.as_mut().downcast_mut::<data::Sum<T>>());
         let mut new_agg = if s_data.is_none() {
             Some(data::Sum {
                 data_points: vec![],
+                start_time,
+                time,
                 temporality: Temporality::Cumulative,
                 is_monotonic: self.monotonic,
             })
@@ -124,16 +128,15 @@ impl<T: Number> Sum<T> {
             None
         };
         let s_data = s_data.unwrap_or_else(|| new_agg.as_mut().expect("present if s_data is none"));
+
+        s_data.start_time = start_time;
+        s_data.time = time;
         s_data.temporality = Temporality::Cumulative;
         s_data.is_monotonic = self.monotonic;
 
-        let prev_start = self.start.lock().map(|start| *start).unwrap_or(t);
-
         self.value_map
             .collect_readonly(&mut s_data.data_points, |attributes, aggr| SumDataPoint {
                 attributes,
-                start_time: prev_start,
-                time: t,
                 value: aggr.value.get_value(),
                 exemplars: vec![],
             });
diff --git a/opentelemetry-sdk/src/testing/metrics/in_memory_exporter.rs b/opentelemetry-sdk/src/testing/metrics/in_memory_exporter.rs
index 8f7ab2183..631e44418 100644
--- a/opentelemetry-sdk/src/testing/metrics/in_memory_exporter.rs
+++ b/opentelemetry-sdk/src/testing/metrics/in_memory_exporter.rs
@@ -210,32 +210,44 @@ impl InMemoryMetricExporter {
         } else if let Some(sum) = data.as_any().downcast_ref::<data::Sum<i64>>() {
             Some(Box::new(data::Sum {
                 data_points: sum.data_points.clone(),
+                start_time: sum.start_time,
+                time: sum.time,
                 temporality: sum.temporality,
                 is_monotonic: sum.is_monotonic,
             }))
         } else if let Some(sum) = data.as_any().downcast_ref::<data::Sum<f64>>() {
             Some(Box::new(data::Sum {
                 data_points: sum.data_points.clone(),
+                start_time: sum.start_time,
+                time: sum.time,
                 temporality: sum.temporality,
                 is_monotonic: sum.is_monotonic,
             }))
         } else if let Some(sum) = data.as_any().downcast_ref::<data::Sum<u64>>() {
             Some(Box::new(data::Sum {
                 data_points: sum.data_points.clone(),
+                start_time: sum.start_time,
+                time: sum.time,
                 temporality: sum.temporality,
                 is_monotonic: sum.is_monotonic,
             }))
         } else if let Some(gauge) = data.as_any().downcast_ref::<data::Gauge<i64>>() {
             Some(Box::new(data::Gauge {
                 data_points: gauge.data_points.clone(),
+                start_time: gauge.start_time,
+                time: gauge.time,
             }))
         } else if let Some(gauge) = data.as_any().downcast_ref::<data::Gauge<f64>>() {
             Some(Box::new(data::Gauge {
                 data_points: gauge.data_points.clone(),
+                start_time: gauge.start_time,
+                time: gauge.time,
             }))
         } else if let Some(gauge) = data.as_any().downcast_ref::<data::Gauge<u64>>() {
             Some(Box::new(data::Gauge {
                 data_points: gauge.data_points.clone(),
+                start_time: gauge.start_time,
+                time: gauge.time,
             }))
         } else {
             // unknown data type
diff --git a/opentelemetry-stdout/src/metrics/exporter.rs b/opentelemetry-stdout/src/metrics/exporter.rs
index 67dbbf4e9..43fbda016 100644
--- a/opentelemetry-stdout/src/metrics/exporter.rs
+++ b/opentelemetry-stdout/src/metrics/exporter.rs
@@ -142,11 +142,33 @@ fn print_sum<T: Debug>(sum: &data::Sum<T>) {
     } else {
         println!("\t\tTemporality  : Delta");
     }
+    let datetime: DateTime<Utc> = sum.start_time.into();
+    println!(
+        "\t\tStartTime    : {}",
+        datetime.format("%Y-%m-%d %H:%M:%S%.6f")
+    );
+    let datetime: DateTime<Utc> = sum.time.into();
+    println!(
+        "\t\tEndTime      : {}",
+        datetime.format("%Y-%m-%d %H:%M:%S%.6f")
+    );
     print_sum_data_points(&sum.data_points);
 }
 
 fn print_gauge<T: Debug>(gauge: &data::Gauge<T>) {
     println!("\t\tGauge DataPoints");
+    if let Some(start_time) = gauge.start_time {
+        let datetime: DateTime<Utc> = start_time.into();
+        println!(
+            "\t\t\tStartTime    : {}",
+            datetime.format("%Y-%m-%d %H:%M:%S%.6f")
+        );
+    }
+    let datetime: DateTime<Utc> = gauge.time.into();
+    println!(
+        "\t\t\tEndTime      : {}",
+        datetime.format("%Y-%m-%d %H:%M:%S%.6f")
+    );
     print_gauge_data_points(&gauge.data_points);
 }
 
@@ -163,16 +185,6 @@ fn print_histogram<T: Debug>(histogram: &data::Histogram<T>) {
 fn print_sum_data_points<T: Debug>(data_points: &[data::SumDataPoint<T>]) {
     for (i, data_point) in data_points.iter().enumerate() {
         println!("\t\tDataPoint #{}", i);
-        let datetime: DateTime<Utc> = data_point.start_time.into();
-        println!(
-            "\t\t\tStartTime    : {}",
-            datetime.format("%Y-%m-%d %H:%M:%S%.6f")
-        );
-        let datetime: DateTime<Utc> = data_point.time.into();
-        println!(
-            "\t\t\tEndTime      : {}",
-            datetime.format("%Y-%m-%d %H:%M:%S%.6f")
-        );
         println!("\t\t\tValue        : {:#?}", data_point.value);
         println!("\t\t\tAttributes   :");
         for kv in data_point.attributes.iter() {
@@ -184,18 +196,6 @@ fn print_sum_data_points<T: Debug>(data_points: &[data::SumDataPoint<T>]) {
 fn print_gauge_data_points<T: Debug>(data_points: &[data::GaugeDataPoint<T>]) {
     for (i, data_point) in data_points.iter().enumerate() {
         println!("\t\tDataPoint #{}", i);
-        if let Some(start_time) = data_point.start_time {
-            let datetime: DateTime<Utc> = start_time.into();
-            println!(
-                "\t\t\tStartTime    : {}",
-                datetime.format("%Y-%m-%d %H:%M:%S%.6f")
-            );
-        }
-        let datetime: DateTime<Utc> = data_point.time.into();
-        println!(
-            "\t\t\tEndTime      : {}",
-            datetime.format("%Y-%m-%d %H:%M:%S%.6f")
-        );
         println!("\t\t\tValue        : {:#?}", data_point.value);
         println!("\t\t\tAttributes   :");
         for kv in data_point.attributes.iter() {