"Tue, 27 Jan 1970 18:27:16"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700127
Only TIME
18:27:16
General datetime
1970-01-27 18:27:16Z
For Database
1970-01-27 18:27:16
For HTTP1.1
Tue, 27 Jan 1970 18:27:16 GMT