"Sat, 31 Jan 1970 19:46:15"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
19:46:15
General datetime
1970-01-31 19:46:15Z
For Database
1970-01-31 19:46:15
For HTTP1.1
Sat, 31 Jan 1970 19:46:15 GMT