Specifying Datetime Field Attributes
The Datetime field is a fixed-length field (26 positions, format of YYYY-MM-DD-HH-MI-SS.999999) that holds dates and times. The maximum date and time precision depends on your database.
Note:
You can use %CLIENTDATE as the default constant for the Datetime field. %CLIENTDATE adjusts the date as appropriate to the time zone of the browser.