> For the complete documentation index, see [llms.txt](https://doc.wearepatchworks.com/product-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.wearepatchworks.com/product-documentation/process-flows/building-process-flows/process-flow-shapes/standard-shapes/map-shape/working-with-field-transformations/available-transform-functions/date-transform-functions/custom-dynamic-date-transform-function.md). # Custom dynamic date transform function ## Introduction The **custom dynamic date** transform function is used to set a target field to the current date and time, based on the date and time that the process flow runs. You can also define rounding and adjustments. ## Adding a custom string transform **Step 1**\ In your process flow, access settings for your map shape:

**Step 2**\ Select the **add transform** button for the required mapping rule - for example:

**Step 3**\ Click the **add transform** button:

**Step 4**\ Click in the **name** field to access a list of all available transform functions, then select **custom dynamic date**:

**Step 5**\ Optionally, you can add adjustment settings - for example:

These options are summarised below:

Field	Summary	Example
Round	Select `start of day` to change the time to `00:00:00` for the date the process flow is run. Select `end of day` to change the time to `23:59:59` for the date the process flow is run .	Suppose that the process flow runs at the following date/time: 2023-08-10 10:30:0 If set to `start of day`, the transformed value would be `2023-08-10 00:00:00`. If set to `end of day`, the transformed value would be `2023-08-10 23:59:59`.
Units	If you want to adjust the date/time, select the required unit - choose from `second`, `minute`, `hour`, `day`, `week`, `month` or `year`.	Suppose that the process flow runs at the following date/time: 2023-08-10 10:30:0 and you want to adjust it by 1 day. In this case, you would select `day` as the `unit` and specify `1` as the `adjustment` value. However, if you wanted to adjust by 1.5 days, you would set the `unit` to `hour` and specify 36 as the `adjustment` value.
Adjustment	Having selected an adjustment unit, enter the required number of that unit here.	See `units` examples above.

**Step 6**\ Accept your changes:

...then save the transformation:

**Step 7**\ Now you can select a target field in the usual way - for example:

...then:

...then:

**Step 8**\ Once your mapping is complete, the row should be displayed without a source field - for example:

From here you can save changes or add more mapping rules as needed. Next time the process flow runs, the **custom dynamic date** will be mapped to the given target field.