"Sun, 22 Feb 1970 00:19:38"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700222
Only TIME
00:19:38
General datetime
1970-02-22 00:19:38Z
For Database
1970-02-22 00:19:38
For HTTP1.1
Sun, 22 Feb 1970 00:19:38 GMT