"Sat, 03 Jan 1970 04:42:48"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
04:42:48
General datetime
1970-01-03 04:42:48Z
For Database
1970-01-03 04:42:48
For HTTP1.1
Sat, 03 Jan 1970 04:42:48 GMT