"Thu, 29 Jan 1970 18:15:35"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700129
Only TIME
18:15:35
General datetime
1970-01-29 18:15:35Z
For Database
1970-01-29 18:15:35
For HTTP1.1
Thu, 29 Jan 1970 18:15:35 GMT