"Sat, 31 Jan 1970 21:42:14"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
21:42:14
General datetime
1970-01-31 21:42:14Z
For Database
1970-01-31 21:42:14
For HTTP1.1
Sat, 31 Jan 1970 21:42:14 GMT