Categories:
Date & Time Functions

ADD_MONTHS

Adds or subtracts a specified number of months to a date or timestamp, preserving the end-of-month information.

Syntax

ADD_MONTHS( <date_or_timestamp_expr> , <num_months_expr> )

Arguments

Required:

date_or_timestamp_expr
This is the date or timestamp expression to which you want to add a specified number of months.
num_months_expr
This is the number of months you want to add. This should be an integer. It may be positive or negative. If the value is a non-integer numeric value (for example, FLOAT) the value will be rounded to the nearest integer.

Returns

The data type of the returned value is the same as the data type of the first parameter. For example, if the input is a DATE, then the output is a DATE. If the input is a TIMESTAMP_NTZ, then the output is a TIMESTAMP_NTZ.

Usage Notes

  • ADD_MONTHS returns slightly different results than DATEADD used with a MONTH component:
    • For both ADD_MONTHS and DATEADD, if the result month has fewer days than the original day, the result day of the month is the last day of the result month.
    • For ADD_MONTHS only, if the original day is the last day of the month, the result day of month will be the last day of the result month.
  • num_months_expr can be a positive or negative integer to either add or subtract months, respectively.

Examples

Add 2 months to a date and cast the date to a timestamp with no time zone:

SELECT ADD_MONTHS('2016-05-15'::timestamp_ntz, 2) AS RESULT;
+-------------------------+
| RESULT                  |
|-------------------------|
| 2016-07-15 00:00:00.000 |
+-------------------------+

Demonstrate preservation of end-of-month information:

  • Add one month to the last day of February 2016 (a leap year).

  • Subtract one month from the last day of May 2016.

    SELECT ADD_MONTHS('2016-02-29'::date, 1) AS RESULT;
    +------------+
    | RESULT     |
    |------------|
    | 2016-03-31 |
    +------------+
    
    SELECT ADD_MONTHS('2016-05-31'::date, -1) AS RESULT;
    +------------+
    | RESULT     |
    |------------|
    | 2016-04-30 |
    +------------+