> ## Documentation Index > Fetch the complete documentation index at: https://docs.less.tech/llms.txt > Use this file to discover all available pages before exploring further. # Date Math > Add or subtract days, seconds, hours and more from date columns You can use the Date Math tool to extract parts of date columns - such as a weekday or year. It is particularly helpful in combinations with others tools. Note that our Syntax also supports date math calculations. See more in the [Syntax](/canvas/syntax) section. ### Configuration The Date Math tool will create a new column. Use this input to name it. Select the Datetime column that you want to add/subtract a duration to/from Select the unit you want to add/subtract to/from your date column. You can select one of the following: * Seconds * Minutes * Hours * Days * Months * Years This input supports syntax, column references and parameters. Input the number of units that you want to add/subtract from your date column. Simply put a **-** (minus) in front of the number of units to subtract instead of add. ### Example: Using syntax to add Days In this example we want to add whatever is in the *simple\_int* column + 10 as days to the *datetime\_column* column. We simply select the *Days* unit and reference the *simple\_int* column + 10 to get the result we want.

This result is by each row. So for row 1, we add 11 days to the *datetime\_column* column. For row 2, we add 12 days to the *datetime\_column* column. And so on.