"Sat, 03 Jan 1970 07:40:42"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
07:40:42
General datetime
1970-01-03 07:40:42Z
For Database
1970-01-03 07:40:42
For HTTP1.1
Sat, 03 Jan 1970 07:40:42 GMT