"Sat, 31 Jan 1970 23:30:43"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
23:30:43
General datetime
1970-01-31 23:30:43Z
For Database
1970-01-31 23:30:43
For HTTP1.1
Sat, 31 Jan 1970 23:30:43 GMT