"Tue, 27 Jan 1970 00:19:03"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700127
Only TIME
00:19:03
General datetime
1970-01-27 00:19:03Z
For Database
1970-01-27 00:19:03
For HTTP1.1
Tue, 27 Jan 1970 00:19:03 GMT