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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Human1000 · 51-55, M

You just need a quasar and time dilation adjustments. I did this in high school.

Zaphod42 · 46-50, M

@Human1000 That sounds interesting! Explain a bit more please?

Human1000 · 51-55, M

@Zaphod42 Each civilization creates a clock using the same quasar, then adjusts universal time based on their relative location from each other to account for distances and movement.

Time dilation is the difference in elapsed time as measured by two clocks, either due to a relative velocity between them (special relativity), or a difference in gravitational potential between their locations (general relativity). When unspecified, "time dilation" usually refers to the effect due to velocity.