"Sun, 22 Feb 1970 00:52:18"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700222
Only TIME
00:52:18
General datetime
1970-02-22 00:52:18Z
For Database
1970-02-22 00:52:18
For HTTP1.1
Sun, 22 Feb 1970 00:52:18 GMT