datetime_expression - a Date or a Date & Time field or expression.
integer - a whole numeric field or expression representing the number of parts to add.
part - the unit of time measurement to add. DATETIME_ADD supports the following values for part:
MICROSECOND: available for Date & Time fields or expressions.
MILLISECOND: available for Date & Time fields or expressions.
SECOND: available for Date & Time fields or expressions.
MINUTE: available for Date & Time fields or expressions.
HOUR: available for Date & Time fields or expressions.
DAY
WEEK: This date part begins on Sunday.
ISOWEEK: Uses ISO 8601 week boundaries. ISO weeks begin on Monday.
MONTH
QUARTER
YEAR
ISOYEAR: Uses the ISO 8601 week-numbering year boundary. The ISO year boundary is the Monday of the first week whose Thursday belongs to the corresponding Gregorian calendar year.
This function is not available for compatibility mode date types.
When using MONTH, QUARTER, or YEAR parts, if the resulting date is at (or near) the last day of the month, DATETIME_ADD returns the last day of the month. This can happen when the month in the resulting date has fewer days than the month in the starting date.
For example, if Date = August 31, 2020, DATETIME_ADD(Date, INTERVAL 1 MONTH) returns September 30, 2020.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-07-22 UTC."],[],[],null,["DATETIME_ADD\n============\n\nAdds a specified time interval to a date or a date and time.\n\nSample usage\n------------\n\n`DATETIME_ADD(Order Date, INTERVAL 1 WEEK)`\n\nSyntax\n------\n\n`DATETIME_ADD( `\u003cvar translate=\"no\"\u003edatetime_expression\u003c/var\u003e`, INTERVAL `\u003cvar translate=\"no\"\u003einteger\u003c/var\u003e` `\u003cvar translate=\"no\"\u003epart\u003c/var\u003e` )`\n\n### Parameters\n\n- \u003cvar translate=\"no\"\u003edatetime_expression\u003c/var\u003e - a Date or a Date \\& Time field or expression.\n- \u003cvar translate=\"no\"\u003einteger\u003c/var\u003e - a whole numeric field or expression representing the number of parts to add.\n- \u003cvar translate=\"no\"\u003epart\u003c/var\u003e - the unit of time measurement to add. DATETIME_ADD supports the following values for `part`:\n - `MICROSECOND`: available for Date \\& Time fields or expressions.\n - `MILLISECOND`: available for Date \\& Time fields or expressions.\n - `SECOND`: available for Date \\& Time fields or expressions.\n - `MINUTE`: available for Date \\& Time fields or expressions.\n - `HOUR`: available for Date \\& Time fields or expressions.\n - `DAY`\n - `WEEK`: This date part begins on Sunday.\n - `ISOWEEK`: Uses [ISO 8601 week](https://en.wikipedia.org/wiki/ISO_week_date) boundaries. ISO weeks begin on Monday.\n - `MONTH`\n - `QUARTER`\n - `YEAR`\n - `ISOYEAR`: Uses the [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) week-numbering year boundary. The ISO year boundary is the Monday of the first week whose Thursday belongs to the corresponding Gregorian calendar year.\n\nReturn data type\n----------------\n\nDate \\& Time\n\nExamples\n--------\n\nNotes\n-----\n\nThis function is not available for compatibility mode date types.\n\nWhen using `MONTH`, `QUARTER`, or `YEAR` parts, if the resulting date is at (or near) the last day of the month, `DATETIME_ADD` returns the last day of the month. This can happen when the month in the resulting date has fewer days than the month in the starting date.\n\nFor example, if **Date** = August 31, 2020, `DATETIME_ADD(Date, INTERVAL 1 MONTH)` returns September 30, 2020.\n\nRelated resources\n-----------------\n\n- [Dates and times](/looker/docs/studio/dates-and-times)\n- [Calculated fields](/looker/docs/studio/about-calculated-fields)\n- [Looker Studio function list](/looker/docs/studio/function-list)"]]
