"Fri, 23 Jan 1970 14:29:29"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700123
Only TIME
14:29:29
General datetime
1970-01-23 14:29:29Z
For Database
1970-01-23 14:29:29
For HTTP1.1
Fri, 23 Jan 1970 14:29:29 GMT