how to insert a current date into a database

[eluser]Unknown[/eluser]
hi . i want to insert the current date and time into the database . In database i was created a table named userdtails in that i created one field named ts_created of type datetime . In this field i have to insert date and time for the detail about the user .
date and time in format of yyyy/mm/dd hrs/minutes/seconds
please anyone help me