"Sun, 15 Feb 1970 07:50:55"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700215
Only TIME
07:50:55
General datetime
1970-02-15 07:50:55Z
For Database
1970-02-15 07:50:55
For HTTP1.1
Sun, 15 Feb 1970 07:50:55 GMT