"Sat, 03 Jan 1970 12:35:36"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
12:35:36
General datetime
1970-01-03 12:35:36Z
For Database
1970-01-03 12:35:36
For HTTP1.1
Sat, 03 Jan 1970 12:35:36 GMT