"Tue, 21 Apr 1970 07:11:36"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700421
Only TIME
07:11:36
General datetime
1970-04-21 07:11:36Z
For Database
1970-04-21 07:11:36
For HTTP1.1
Tue, 21 Apr 1970 07:11:36 GMT