"Fri, 02 Jan 1970 23:33:40"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700102
Only TIME
23:33:40
General datetime
1970-01-02 23:33:40Z
For Database
1970-01-02 23:33:40
For HTTP1.1
Fri, 02 Jan 1970 23:33:40 GMT