"Tue, 27 Jan 1970 20:38:02"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700127
Only TIME
20:38:02
General datetime
1970-01-27 20:38:02Z
For Database
1970-01-27 20:38:02
For HTTP1.1
Tue, 27 Jan 1970 20:38:02 GMT