"Sat, 17 Jan 1970 12:34:45"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
12:34:45
General datetime
1970-01-17 12:34:45Z
For Database
1970-01-17 12:34:45
For HTTP1.1
Sat, 17 Jan 1970 12:34:45 GMT