How to measure time from adb shell with milliseconds resolution?

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mksh (the standard Android shell since version 4.0) has a built-in EPOCHREALTIME environment variable:

Time since the epoch, as returned by gettimeofday(2), formatted as decimal tv_sec followed by a dot . and tv_usec padded to exactly six decimal digits.

So the command to get epoch time with microsecond accuracy in Windows would be:

adb shell echo $EPOCHREALTIME

or in Linux:

adb shell 'echo $EPOCHREALTIME'

If you just need millisecond accuracy:

adb shell 'echo ${EPOCHREALTIME:0:14}'

Or just the milliseconds part to use with another time format:

adb shell 'echo $(date +%T)${EPOCHREALTIME:10:4}'

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