"Sat, 31 Jan 1970 00:09:39"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
00:09:39
General datetime
1970-01-31 00:09:39Z
For Database
1970-01-31 00:09:39
For HTTP1.1
Sat, 31 Jan 1970 00:09:39 GMT