Example for using continuation in /getTagData response

I understand what the continuation property is for, but I’m unable to find any practical information or examples on how to use it.    I sent an aggregate request to canary, and the response had three datetimes in it.    I’m guessing each index is important?   What does each date represent?    

I queried minutely start values (Start, 1m) for a whole dataset to identify minute intervals where data exists.    The continuation field in the response has three datetimes in it, all with the same date component but different times:  

16:30:00

00:00:00

16:00:00

How am I to use these three dates in subsequent requests?