"Sat, 04 Apr 1970 07:12:20"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700404
Only TIME
07:12:20
General datetime
1970-04-04 07:12:20Z
For Database
1970-04-04 07:12:20
For HTTP1.1
Sat, 04 Apr 1970 07:12:20 GMT