"Sun, 22 Feb 1970 19:40:56"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700222
Only TIME
19:40:56
General datetime
1970-02-22 19:40:56Z
For Database
1970-02-22 19:40:56
For HTTP1.1
Sun, 22 Feb 1970 19:40:56 GMT