How to plot only the matches of two different datetime?

I have two datas that have different dimensions of datetime.

Datetime A has value of a, and datetime B which is shorter has b.

Is it possible to plot values a when datetime A and B matches? If so, can I know what to do?

Answer 1

[dpb]

Convert A and B to timetables, then use innerjoin

ttC=innerjoin(ttA,ttB);

will leave timetable ttC with the times that are unique to both tables.

Answer 2

[Peter Perkins]

If all you have are two datetime vectors, you can use intersect to find the common values. But I'm guessing you have other data as well, so dpb's suggestion is likely the right one.