"Sat, 21 Feb 1970 12:03:05"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700221
Only TIME
12:03:05
General datetime
1970-02-21 12:03:05Z
For Database
1970-02-21 12:03:05
For HTTP1.1
Sat, 21 Feb 1970 12:03:05 GMT