I’m not sure when it was added or if it was always there, but there are actions to “play the offset of music/sound on a channel” and no information about that on the wiki page.
Maybe something like “Play music from time stamp.”
Other terms could be timeline or time value…
Most of the music editors I’ve worked with use timeline, but they also have time markers to create envelopes for effects and other controls at the cursor position - related, but they have different purposes.
But in the event editor, it just asks for a channel identifier, modification sign, and “value”. It’s not quite clear what the syntax or format should be, if any (i.e., hh:mm:ss for time) other than “number” or “valid expression call”.