"Tue, 27 Jan 1970 19:39:13"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700127
Only TIME
19:39:13
General datetime
1970-01-27 19:39:13Z
For Database
1970-01-27 19:39:13
For HTTP1.1
Tue, 27 Jan 1970 19:39:13 GMT