"Sat, 24 Jan 1970 14:15:15"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700124
Only TIME
14:15:15
General datetime
1970-01-24 14:15:15Z
For Database
1970-01-24 14:15:15
For HTTP1.1
Sat, 24 Jan 1970 14:15:15 GMT