Those who know programming simply call this as DateTime. For example, "2015-12-22 03:11:25".
Instead of referring it to simply DateTime, is there any other suitable name?
Though perhaps awkward in some contexts, timestamp does fit your desired meaning.
The date and time at which an event occurs or occurred, usually indicated in human-readable form, especially when used in a log to track events.
I use "time" as it may include both date and time, but if you use just "date", the time is not necessarily included.