> For the complete documentation index, see [llms.txt](https://docs.rewst.help/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.rewst.help/documentation/automations/actions-in-rewst/transform-actions/add-or-subtract-from-datetime-transform-action.md).

# Add or subtract from DateTime transform action

## Use case

You would like to programmatically determine what the date was thirty days ago.

## Overview

Add or Subtract from a DateTime

## Parameters

<table><thead><tr><th width="217">Parameter</th><th width="417.3333333333333">Description</th><th data-type="checkbox">Required</th></tr></thead><tbody><tr><td>DateTime to add or subtract from</td><td>Use https://strftime.org/ for various options</td><td>true</td></tr><tr><td>Days to add or subtract</td><td>Integer value for how many days to add or subtract.</td><td>false</td></tr><tr><td>Hours to add or subtract</td><td>Integer value for how many hours to add or subtract.</td><td>false</td></tr><tr><td>Microseconds to add or subtract</td><td>Integer value for how many microseconds to add or subtract.</td><td>false</td></tr><tr><td>Minutes to add or subtract</td><td>Integer value for how many minutes to add or subtract.</td><td>false</td></tr><tr><td>Months to add or subtract</td><td>Integer value for how many months to add or subtract.</td><td>false</td></tr><tr><td>Seconds to add or subtract</td><td>Integer value for how many seconds to add or subtract.</td><td>false</td></tr><tr><td>Years to add or subtract</td><td>Integer value for how many years to add or subtract.</td><td>false</td></tr></tbody></table>

## Usage

<details>

<summary>Example: Get 30 days from today's date</summary>

Inputs:

**DateTime to add or subtract from:** `{{ now("UTC","%m-%d-%Y") }}`**Days to add or subtract:** 30

The rest of the inputs in this example are blank.

</details>

## Results output

Result from Example 1 (if run on 04/16/2025):

```
"2025-05-16T00:00:00+00:00"
```


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.rewst.help/documentation/automations/actions-in-rewst/transform-actions/add-or-subtract-from-datetime-transform-action.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.