Comparing two different catalogs documenting the same events

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I have two catalogs that give the time and locations of events. One catalog has many more events than the other, and I need to identify the matching events and create a third catalog with these events as the output. I cannot figure out how to compare the times/dates. I need the events to match within say 5 minutes and my catalog range is 25 years. How do I get Matlab to find my time/date columns and compare them? Then how do I convert the time/date information into one string that I can use to compute the difference. (I think I want time in hours?) Thanks!