"Sat, 31 Jan 1970 19:45:42"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
19:45:42
General datetime
1970-01-31 19:45:42Z
For Database
1970-01-31 19:45:42
For HTTP1.1
Sat, 31 Jan 1970 19:45:42 GMT