ADD_DAYS Function

Function Description

The ADD_DAYS function is used to add numDays days to the given date startDate, returning a new date. If the result exceeds the date range supported by the system, it returns null.

Function Syntax

add_days(startDate, numDays)

Parameter Description

• startDate: Date type, represents the start date.
• numDays: Integer type, represents the number of days to add.

Return Result

Returns a new date of type date.

Usage Example

1. Add 5 days to the specified date:

SELECT add_days('2022-01-01', 5);

Results:

2022-01-06

2. Subtract 10 days from a specified date:

SELECT add_days('2022-01-15', -10);

Results:

2022-01-05

3. Calculate the important meeting date 100 days later:

SELECT add_days('2022-03-01', 100);

Results:

2022-06-09

4. Calculate the end date 200 days after the start date of a certain project:

SELECT add_days('2022-01-20', 200);

Results:

2022-08-18

Notes

• Ensure that the startDate parameter is in a valid date format, otherwise the function will return null.
• When the added days cause the date to exceed the system's supported range, the function will return null. Please check the return value.

By using the ADD_DAYS function, you can easily calculate future or past dates, providing great convenience when dealing with date-related issues.