"Sat, 31 Jan 1970 23:30:37"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
23:30:37
General datetime
1970-01-31 23:30:37Z
For Database
1970-01-31 23:30:37
For HTTP1.1
Sat, 31 Jan 1970 23:30:37 GMT