"Tue, 21 Apr 1970 07:11:37"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700421
Only TIME
07:11:37
General datetime
1970-04-21 07:11:37Z
For Database
1970-04-21 07:11:37
For HTTP1.1
Tue, 21 Apr 1970 07:11:37 GMT