"Tue, 27 Jan 1970 07:49:47"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700127
Only TIME
07:49:47
General datetime
1970-01-27 07:49:47Z
For Database
1970-01-27 07:49:47
For HTTP1.1
Tue, 27 Jan 1970 07:49:47 GMT