Any big brains out there know of a universal way to measure time?

Like let’s say we’ve made contact with an alien race and have figured out communications. We want to tell them a thing will happen at a specific time, but they have a different means of measurement that we can’t understand. Is there a universal constant way to measure time that doesn’t assume a standard planetary rotation, or the reactions of a specific atom to specific conditions? A constant regardless of environmental conditions that with the basic equipment of a reasonably techno-savvy civilization could easily be measured

*edit* Could the hydrogen line frequency be used as constance reference point perhaps?

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ArishMell · 70-79, M

The problem with using frequency as so many posts here suggest, is that requires a defined unit of time - the second for us. So trying to correlate frequency with how it is defined by some other culture using a radically different scale invokes a sort of circular argument, or at least is a recipe for confusion.

Using a radioactive isotope's half-life might work, provided that isotope exists in both places. Given we are in galactic-scales though, counting pulsar beats seems the best and simplest constant.