"Fri, 23 Jan 1970 00:54:56"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700123
Only TIME
00:54:56
General datetime
1970-01-23 00:54:56Z
For Database
1970-01-23 00:54:56
For HTTP1.1
Fri, 23 Jan 1970 00:54:56 GMT