"Sat, 24 Jan 1970 20:35:48"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700124
Only TIME
20:35:48
General datetime
1970-01-24 20:35:48Z
For Database
1970-01-24 20:35:48
For HTTP1.1
Sat, 24 Jan 1970 20:35:48 GMT