"Sat, 31 Jan 1970 12:33:56"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
12:33:56
General datetime
1970-01-31 12:33:56Z
For Database
1970-01-31 12:33:56
For HTTP1.1
Sat, 31 Jan 1970 12:33:56 GMT