Absolute Time Input Formats
The legal format for inputting an absolute time is:
hh:mm[:ss] [am|pm] [gmt]
Input formats for absolute times are assumed to be on a 24-hour clock. If you enter a time with an am or pm designation, the DBMS Server automatically converts the time to a 24-hour internal representation.
If you omit gmt (Greenwich Mean Time), the local time zone designation is assumed. Times are stored and displayed using the time zone adjustment specified by II_TIMEZONE_NAME. If you enter an absolute time without a date, the current system date is assumed.