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Do you know your own time measurement?

NO

YES

(1) Do you know how someone else sees your time or (2) how someone else sees their own time?

(1) Do you care about what someone else perceives your time as or do you care what someone else's time is?

(Is the event stationary to you or someone else?

(1) Their own time (Event is them)

(2) Your time (Event is you)

You know normal time and you need to find proper time

You know proper time and find the normal time

(1) Some else perceives you

(Event is you)

(2) Some else perceives you

(Event is you)

You know proper time and the observer's perception of you is normal time

You have normal time and their time is proper time.

Time Dilation

Finding Proper Time for Dummies