"Sat, 31 Jan 1970 18:27:08"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
18:27:08
General datetime
1970-01-31 18:27:08Z
For Database
1970-01-31 18:27:08
For HTTP1.1
Sat, 31 Jan 1970 18:27:08 GMT