"Sat, 10 Jan 1970 19:40:33"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700110
Only TIME
19:40:33
General datetime
1970-01-10 19:40:33Z
For Database
1970-01-10 19:40:33
For HTTP1.1
Sat, 10 Jan 1970 19:40:33 GMT