"Tue, 27 Jan 1970 07:49:56"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700127
Only TIME
07:49:56
General datetime
1970-01-27 07:49:56Z
For Database
1970-01-27 07:49:56
For HTTP1.1
Tue, 27 Jan 1970 07:49:56 GMT