"Sat, 10 Jan 1970 21:42:44"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700110
Only TIME
21:42:44
General datetime
1970-01-10 21:42:44Z
For Database
1970-01-10 21:42:44
For HTTP1.1
Sat, 10 Jan 1970 21:42:44 GMT