"Tue, 03 Feb 1970 00:40:03"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700203
Only TIME
00:40:03
General datetime
1970-02-03 00:40:03Z
For Database
1970-02-03 00:40:03
For HTTP1.1
Tue, 03 Feb 1970 00:40:03 GMT