"Sat, 03 Jan 1970 14:42:22"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
14:42:22
General datetime
1970-01-03 14:42:22Z
For Database
1970-01-03 14:42:22
For HTTP1.1
Sat, 03 Jan 1970 14:42:22 GMT