"Sun, 03 May 1970 07:12:42"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700503
Only TIME
07:12:42
General datetime
1970-05-03 07:12:42Z
For Database
1970-05-03 07:12:42
For HTTP1.1
Sun, 03 May 1970 07:12:42 GMT