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ADDTIME/SUBTIME(t,a) 

ADDTIME(t,a) and SUBTIME(t,a) are time functions that calculate a time/timestamp value in the past or future.

t: time_or_timestamp_expression
a:
time_expression

 

Result of the ADDTIME(t,a)/SUBTIME(t,a) function

Addition of a to t/
subtraction of a from t

Time value or time stamp value

SUBTIME(t,a) and t and a are time values

a must be less than t, otherwise an error is output

t or a is NULL value

NULL value

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