Dates and times can be retrieved from the database in one of the following ways:
Using any interface, as a string
Using ODBC or OLE DB, as a binary value (using an ODBC TIMESTAMP_STRUCT structure for example)
Using embedded SQL, as a SQLDATETIME structure
Date and time of day with a time zone offset can be retrieved from the database as a string only.
When a date or time, with or without a time zone offset, is retrieved as a string, it is retrieved in the format specified by the database options date_format, time_format, timestamp_format, and timestamp_with_time_zone_format.
The following arithmetic operators are allowed on dates:
timestamp + integer Add the specified number of days to a date or timestamp.
timestamp - integer Subtract the specified number of days from a date or timestamp.
date - date Compute the number of days between two dates or timestamps.
date + time Create a timestamp combining the given date and time.
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