"Sat, 10 Jan 1970 18:14:55"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700110
Only TIME
18:14:55
General datetime
1970-01-10 18:14:55Z
For Database
1970-01-10 18:14:55
For HTTP1.1
Sat, 10 Jan 1970 18:14:55 GMT