"Sat, 03 Jan 1970 23:35:08"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
23:35:08
General datetime
1970-01-03 23:35:08Z
For Database
1970-01-03 23:35:08
For HTTP1.1
Sat, 03 Jan 1970 23:35:08 GMT