"Sat, 31 Jan 1970 00:40:06"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
00:40:06
General datetime
1970-01-31 00:40:06Z
For Database
1970-01-31 00:40:06
For HTTP1.1
Sat, 31 Jan 1970 00:40:06 GMT