"Sat, 31 Jan 1970 18:27:03"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
18:27:03
General datetime
1970-01-31 18:27:03Z
For Database
1970-01-31 18:27:03
For HTTP1.1
Sat, 31 Jan 1970 18:27:03 GMT