"Sat, 31 Jan 1970 21:42:03"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
21:42:03
General datetime
1970-01-31 21:42:03Z
For Database
1970-01-31 21:42:03
For HTTP1.1
Sat, 31 Jan 1970 21:42:03 GMT