'How to add current UTC Time in MKV file metadata using ffmpeg?

I am not sure if it's possible, but is there anyway we can add current UTC time inside the mkv metatag using ffmpeg? i read https://wiki.multimedia.cx/index.php?title=FFmpeg_Metadata but i could not find anything.

-metadata "Creation Time"="Need to add time tag/code"

output will show

Creation Time: UTC 2020-06-04 02:40:29
ffmpegmetadatamedia


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