"Sat, 03 Jan 1970 18:15:46"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
18:15:46
General datetime
1970-01-03 18:15:46Z
For Database
1970-01-03 18:15:46
For HTTP1.1
Sat, 03 Jan 1970 18:15:46 GMT