"Sat, 17 Jan 1970 18:12:54"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
18:12:54
General datetime
1970-01-17 18:12:54Z
For Database
1970-01-17 18:12:54
For HTTP1.1
Sat, 17 Jan 1970 18:12:54 GMT