"Sat, 17 Jan 1970 18:27:22"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
18:27:22
General datetime
1970-01-17 18:27:22Z
For Database
1970-01-17 18:27:22
For HTTP1.1
Sat, 17 Jan 1970 18:27:22 GMT