"Tue, 27 Jan 1970 04:42:44"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700127
Only TIME
04:42:44
General datetime
1970-01-27 04:42:44Z
For Database
1970-01-27 04:42:44
For HTTP1.1
Tue, 27 Jan 1970 04:42:44 GMT