"Fri, 23 Jan 1970 02:46:38"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700123
Only TIME
02:46:38
General datetime
1970-01-23 02:46:38Z
For Database
1970-01-23 02:46:38
For HTTP1.1
Fri, 23 Jan 1970 02:46:38 GMT