> For the complete documentation index, see [llms.txt](https://docs.verbdata.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.verbdata.com/data-transformations/building-transformations/transformation-steps/date-operation.md). # Date Operation Enables changes to date values for a specific column within the selected table. Date values can be modified by any increment from Years down to Milliseconds. Time zones are treated as Static values. The results can either Override Input Column, or create a new Column. #### Add to Date Adds selected unit of measure to each row with the selected column of date values. #### Subtract From Date Subtracts selected unit of measure to each row with the selected column of date values. #### Difference Between Dates, Creates a new column with the difference between two selected columns using the specified unit of measurement #### Get Part of Date Creates a new column with the specified part of the date for the selected column. #### Convert Time Zone The time zone must be in the IANA format ie: US/Central For more information see: To select from a dropdown list of time zones, select “Static Value” for the original and/or new time zone. #### From Unix Epoch The input must be a timestamp in seconds (10-digit), milliseconds (13-digit) or microseconds (16-digit). --- # 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, and the optional `goal` query parameter: ``` GET https://docs.verbdata.com/data-transformations/building-transformations/transformation-steps/date-operation.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. 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.