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+---
+title: Manipulate timestamps with Flux
+description: >
+  Use Flux to process and manipulate timestamps.
+menu:
+  v2_0:
+    name: Manipulate timestamps
+    parent: How-to guides
+weight: 209
+---
+
+Every point stored in InfluxDB has an associated timestamp.
+Flux includes tools to process and manipulate timestamps to suit your needs.
+
+- [Timestamp conversions](#timestamp-conversions)
+- [Common scenarios](#common-scenarios)
+- [Time-related Flux functions](#time-related-flux-functions)
+
+## Timestamp conversions
+
+### Convert nanosecond epoch timestamp to RFC3339
+Use the [`time()` function](/v2.0/reference/flux/stdlib/built-in/transformations/type-conversions/time/)
+to convert a **nanosecond** epoch timestamp to RFC3339 format.
+
+```js
+time(v: 1568808000000000000)
+// Returns 2019-09-18T12:00:00.000000000Z
+```
+
+### Convert RFC3339 timestamp to nanosecond epoch timestamp
+Use the [`uint()` function](/v2.0/reference/flux/stdlib/built-in/transformations/type-conversions/unit/)
+to convert an RFC3339 timestamp to a nanosecond epoch timestamp.
+
+```js
+uint(v: 2019-09-18T12:00:00.000000000Z)
+// Returns 1568808000000000000
+```
+
+## Common scenarios
+
+### Calculate the duration between two timestamps
+Flux doesn't support mathematical operations with time values.
+To calculate the duration between two timestamps:
+
+1. Use the `uint()` function to convert each timestamp to a nanosecond epoch timestamp.
+2. Subtract one nanosecond epoch timestamp from the other.
+3. Use the `duration()` function to convert the result into a duration.
+
+```js
+time1 = uint(v: 2019-09-17T21:12:05Z)
+time2 = uint(v: 2019-09-18T22:16:35Z)
+
+duration(v: time2 - time1)
+// Returns 25h4m30s
+```
+
+{{% note %}}
+Flux doesn't support duration column types.
+To store a duration in a column, use the [`string()` function](/v2.0/reference/flux/stdlib/built-in/transformations/type-conversions/string/)
+to convert it to a string.
+{{% /note %}}
+
+## Time-related Flux functions
+
+#### now()
+Use the [`now()` function](/v2.0/reference/flux/stdlib/built-in/misc/now/) to
+return the current UTC time in RFC3339 format.
+
+```js
+now()
+```
+
+#### experimental.addDuration()
+The [`experimental.addDuration()` function](/v2.0/reference/flux/stdlib/experimental/addduration/)
+adds a duration to a specified time and returns the resulting time.
+
+{{% warn %}}
+By using `experimental.addDuration()`, you accept the
+[risks of experimental functions](/v2.0/reference/flux/stdlib/experimental/#use-experimental-functions-at-your-own-risk).
+{{% /warn %}}
+
+```js
+import "experimental"
+
+experimental.addDuration(
+  d: 6h,
+  to: 2019-09-16T12:00:00Z,
+)
+
+// Returns 2019-09-16T18:00:00.000000000Z
+```
+
+#### experimental.subDuration()
+The [`experimental.addDuration()` function](/v2.0/reference/flux/stdlib/experimental/subduration/)
+subtracts a duration from a specified time and returns the resulting time.
+
+{{% warn %}}
+By using `experimental.addDuration()`, you accept the
+[risks of experimental functions](/v2.0/reference/flux/stdlib/experimental/#use-experimental-functions-at-your-own-risk).
+{{% /warn %}}
+
+```js
+import "experimental"
+
+experimental.subDuration(
+  d: 6h,
+  from: 2019-09-16T12:00:00Z,
+)
+
+// Returns 2019-09-16T06:00:00.000000000Z
+```