"Sat, 03 Jan 1970 23:36:42"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
23:36:42
General datetime
1970-01-03 23:36:42Z
For Database
1970-01-03 23:36:42
For HTTP1.1
Sat, 03 Jan 1970 23:36:42 GMT