"Tue, 27 Jan 1970 21:42:56"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700127
Only TIME
21:42:56
General datetime
1970-01-27 21:42:56Z
For Database
1970-01-27 21:42:56
For HTTP1.1
Tue, 27 Jan 1970 21:42:56 GMT