"Sat, 21 Mar 1970 07:11:19"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700321
Only TIME
07:11:19
General datetime
1970-03-21 07:11:19Z
For Database
1970-03-21 07:11:19
For HTTP1.1
Sat, 21 Mar 1970 07:11:19 GMT