"Sun, 25 Jan 1970 00:18:55"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700125
Only TIME
00:18:55
General datetime
1970-01-25 00:18:55Z
For Database
1970-01-25 00:18:55
For HTTP1.1
Sun, 25 Jan 1970 00:18:55 GMT