"Sat, 31 Jan 1970 14:24:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
14:24:21
General datetime
1970-01-31 14:24:21Z
For Database
1970-01-31 14:24:21
For HTTP1.1
Sat, 31 Jan 1970 14:24:21 GMT