"Mon, 20 Apr 1970 07:11:54"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700420
Only TIME
07:11:54
General datetime
1970-04-20 07:11:54Z
For Database
1970-04-20 07:11:54
For HTTP1.1
Mon, 20 Apr 1970 07:11:54 GMT