"Sat, 31 Jan 1970 07:48:27"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700131
Only TIME
07:48:27
General datetime
1970-01-31 07:48:27Z
For Database
1970-01-31 07:48:27
For HTTP1.1
Sat, 31 Jan 1970 07:48:27 GMT