Section 2. Calculating Date and Time
- ADDTIME() – Add a time interval to a time value or datetime value.
 - DATE_ADD() – Add a time value to a date (synonyms: ADDDATE()).
 - DATE_SUB() – Subtract a time value (interval) from a date.
 - DATEDIFF() – Return the difference in days of two date values.
 - TIMEDIFF() – Return the difference of two time values.
 - TIMESTAMPADD() – Add or subtract an interval from a timestamp or date.
 - TIMESTAMPDIFF() – Return the difference between two timestamp values.
 - TIME_TO_SEC() – Return the number of seconds from a time argument.
 - TO_DAYS() – Return a day number (the number of days since year 0) from a given date.
 
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