"Sat, 31 Jan 1970 12:02:39"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
12:02:39
General datetime
1970-01-31 12:02:39Z
For Database
1970-01-31 12:02:39
For HTTP1.1
Sat, 31 Jan 1970 12:02:39 GMT