"Tue, 27 Jan 1970 14:24:42"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700127
Only TIME
14:24:42
General datetime
1970-01-27 14:24:42Z
For Database
1970-01-27 14:24:42
For HTTP1.1
Tue, 27 Jan 1970 14:24:42 GMT