Good! So here my definition: Every measurement of time relies of a periodic process. If you just have random translational movement without a periodic movement, you cannot measure or define time. So time is simply a measuring process: you compare a certain periodic movement (namely the number of periods that have passed) e.g. with the duration of a non-periodic translatory (translational) movement. e.g. with the duration that it takes for particle to move from one point in space to another (or also with another periodic movement). That's all. Nothing philosophical to it. Time and its measurement can automatically start with periodic movement, it isn't there before and isn't "created" in some mysterious way .
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