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unleash.unleash/website/docs/how-to/how-to-schedule-feature-releases.mdx
2022-03-14 18:36:01 +01:00

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---
title: How to schedule feature releases
---
import ApiRequest from '@site/src/components/ApiRequest'
:::info Placeholders
Placeholders in the code samples below are delimited by angle brackets (i.e. `<placeholder-name>`). You will need to replace them with the values that are correct in _your_ situation for the code samples to run properly.
:::
Scheduling feature releases is good. You may want to:
- release a feature at a specific date and time (product launch)
- only have a feature available up until a specific moment (such as a contest cutoff etc)
- make a feature available during a specific period (24 flash sale, Black Friday, etc)
Obviously Unleash can help you with this.
There's two distinct ways to do this with Unleash:
- [Using strategy constraints](#strategy-constraints)
- [Using custom activation strategies](#custom-activation-strategies)
This guide will show you how to schedule a release in the future, but the exact same logic applies if you want to make a feature available until some point in the future. Finally, if you want to only make a feature available during a limited time period, combine the two options.
## Prerequisites
This guide assumes that you've got some experience with Unleash, that you've got an instance up and running, and that you've got a feature toggle with a strategy that you want to schedule the release for. Additionally, each of the two ways of doing this have slightly different prerequisites themselves.
## Schedule feature releases with strategy constraints {#strategy-constraints}
### Prerequirements
- Unleash Enterprise 4.9 or later
- SDKs that support advanced strategy constraints
### Step 1: Add a date-based strategy constraint
To schedule feature release via the UI
On the strategy that you want to schedule, use the "new constraint" button to add a new constraint.
Select the `currentTime` context field from the dropdown and choose the one of the date-based operators.
Finally, select when the feature should be released.
#### Via the API
To use the API to add a constraint, you should use the `DATE_AFTER` `operator`, the `currentTime` `contextName` and the date as the `value`.
<ApiRequest verb="patch" payload={[{"op": "replace", "path": "/constraints", "value": [{
"value": "2022-01-01T00:00:00.000Z",
"inverted": false,
"operator": "DATE_AFTER",
"contextName": "currentTime",
"caseInsensitive": false
}
]}]} url="api/admin/projects/<project-id>/features/environments/<environment>/strategies/<strategy-id>" title="Set a time-based constraint on a strategy"/>
## Schedule feature releases with custom activation strategies {#custom-activation-strategies}
### Requirements
- Unleash v3.3 or later
### Step 1: Define a custom activation strategy
See the how-to guide for more granular instructions, but you'd define a custom strategy with an `enableAfter` parameter in the form of a time format you can parse.
### Step 2: Implement the custom activation strategy in your clients
Again, following the steps in the guide, you'd implement this strategy in each of your clients.
### See the how-to guide for custom activation strategies