"Sat, 10 Jan 1970 21:47:47"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700110
Only TIME
21:47:47
General datetime
1970-01-10 21:47:47Z
For Database
1970-01-10 21:47:47
For HTTP1.1
Sat, 10 Jan 1970 21:47:47 GMT