"Fri, 23 Jan 1970 07:47:49"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700123
Only TIME
07:47:49
General datetime
1970-01-23 07:47:49Z
For Database
1970-01-23 07:47:49
For HTTP1.1
Fri, 23 Jan 1970 07:47:49 GMT