"Sat, 10 Jan 1970 09:21:57"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700110
Only TIME
09:21:57
General datetime
1970-01-10 09:21:57Z
For Database
1970-01-10 09:21:57
For HTTP1.1
Sat, 10 Jan 1970 09:21:57 GMT