"Sat, 10 Jan 1970 21:37:36"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700110
Only TIME
21:37:36
General datetime
1970-01-10 21:37:36Z
For Database
1970-01-10 21:37:36
For HTTP1.1
Sat, 10 Jan 1970 21:37:36 GMT