"Sat, 21 Feb 1970 11:26:03"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700221
Only TIME
11:26:03
General datetime
1970-02-21 11:26:03Z
For Database
1970-02-21 11:26:03
For HTTP1.1
Sat, 21 Feb 1970 11:26:03 GMT