"Tue, 17 Feb 1970 18:16:04"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700217
Only TIME
18:16:04
General datetime
1970-02-17 18:16:04Z
For Database
1970-02-17 18:16:04
For HTTP1.1
Tue, 17 Feb 1970 18:16:04 GMT