"Tue, 27 Jan 1970 18:15:37"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700127
Only TIME
18:15:37
General datetime
1970-01-27 18:15:37Z
For Database
1970-01-27 18:15:37
For HTTP1.1
Tue, 27 Jan 1970 18:15:37 GMT