I'm sure this must have been asked before - apologies if so, but I can't find it discussed anywhere.

As I understand it "When new quotations are received, the "start()" function of attached expert advisors and custom indicator programs is executed."
I want to do some checks at the first quote of a new 5 min candle. Is there an elegant way to check that this is the first quote of a new candle?

thanks in advance for any ideas.