"Sat, 03 Jan 1970 03:40:55"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
03:40:55
General datetime
1970-01-03 03:40:55Z
For Database
1970-01-03 03:40:55
For HTTP1.1
Sat, 03 Jan 1970 03:40:55 GMT