Date and times may be sent to the database in one of the following ways:
Using any interface, as a string
Using ODBC, as a TIMESTAMP structure
Using embedded SQL, as a SQLDATETIME structure
When a time is sent to the database as a string (for the TIME data type) or as part of a string (for TIMESTAMP or DATE data types), the hours, minutes, and seconds must be separated by colons in the format hh:mm:ss.sss, but can appear anywhere in the string. The following are valid and unambiguous strings for specifying times:
21:35 -- 24 hour clock if no am or pm specified 10:00pm -- pm specified, so interpreted as 12 hour clock 10:00 -- 10:00am in the absence of pm 10:23:32.234 -- seconds and fractions of a second included
When a date is sent to the database as a string conversion to a DATE or TIMESTAMP data type is automatic. The string can be supplied in one of two ways:
As a string of format yyyy/mm/dd or yyyy-mm-dd, which is interpreted unambiguously by the database.
As a string interpreted according to the date_order database option. See date_order option [compatibility].
Transact-SQL string-to-date/time conversions