"Sat, 10 Jan 1970 21:48:29"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700110
Only TIME
21:48:29
General datetime
1970-01-10 21:48:29Z
For Database
1970-01-10 21:48:29
For HTTP1.1
Sat, 10 Jan 1970 21:48:29 GMT