"Sat, 03 Jan 1970 23:31:47"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
23:31:47
General datetime
1970-01-03 23:31:47Z
For Database
1970-01-03 23:31:47
For HTTP1.1
Sat, 03 Jan 1970 23:31:47 GMT