"Sun, 22 Feb 1970 07:12:37"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700222
Only TIME
07:12:37
General datetime
1970-02-22 07:12:37Z
For Database
1970-02-22 07:12:37
For HTTP1.1
Sun, 22 Feb 1970 07:12:37 GMT