"Sat, 31 Jan 1970 23:32:33"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
23:32:33
General datetime
1970-01-31 23:32:33Z
For Database
1970-01-31 23:32:33
For HTTP1.1
Sat, 31 Jan 1970 23:32:33 GMT