"Mon, 05 Jan 1970 02:46:44"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700105
Only TIME
02:46:44
General datetime
1970-01-05 02:46:44Z
For Database
1970-01-05 02:46:44
For HTTP1.1
Mon, 05 Jan 1970 02:46:44 GMT