"Sat, 03 Jan 1970 20:35:54"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
20:35:54
General datetime
1970-01-03 20:35:54Z
For Database
1970-01-03 20:35:54
For HTTP1.1
Sat, 03 Jan 1970 20:35:54 GMT