How to add encoding date metadata for mkv?

[iKron]

i am not sure if this is possible, is there anyway we can add creation time/encoding time. probably using this command we can add metadata, but how can we add current UTC or Local time?

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

output

Creation Time: UTC 2021-01-01 04:30:19

[El Heggunte]

You can use mkvpropedit with a custom tags.xml file.

From the mkvpropedit --help screen:

 Actions for handling tags and chapters:
-t, --tags <selector:filename>

Add or replace tags in the file with the ones from 'filename' or remove them if 'filename' is empty.

From example-tags-2.xml:

<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE Tags SYSTEM "matroskatags.dtd">

<Tags>
  <Tag>
    <Targets>
      <!-- TrackUIDs and ChapterUIDs can occur more than once. -->
      <TrackUID>1</TrackUID>
      <TrackUID>2</TrackUID>
      <TrackUID>3</TrackUID>
      <TrackUID>4</TrackUID>
      <ChapterUID>2</ChapterUID>
      <ChapterUID>4</ChapterUID>
      <ChapterUID>6</ChapterUID>
      <ChapterUID>8</ChapterUID>
    </Targets>

    <!-- The new tagging system. It's more or less a 'Name=String' system, -->
    <!-- but entries may also be nested. Also the Matroska specs give -->
    <!-- you a set of pre-defined tag names for better cross-application -->
    <!-- usability. However, you are free to use your own tag names. -->
    <Simple>
      <Name>LEAD_PERFORMER</Name>
      <String>Tori Amos</String>
    </Simple>
    <Simple>
      <Name>ALBUM</Name>
      <String>Under the Pink</String>
      <Simple>
        <Name>TITLE</Name>
        <String>Cornflake Girl</String>
      </Simple>
    </Simple>

  </Tag>
</Tags>

More info at: https://www.matroska.org/technical/tagging.html