The time attribute of MIDI messages is stored as delta time in ticks, which means it does not tell you when a note is played within a file, rather it tells you how many ticks have passed since the last message.
However, a clue as to what is actually a chord may 'note_on' messages with a 'time' value of 0 that are preceded by 'note_on' messages with values higher than 0. The notes with the higher value may point to the lowest note in the chord.
The time attribute of MIDI messages is stored as delta time in ticks, which means it does not tell you when a note is played within a file, rather it tells you how many ticks have passed since the last message.
However, a clue as to what is actually a chord may 'note_on' messages with a 'time' value of 0 that are preceded by 'note_on' messages with values higher than 0. The notes with the higher value may point to the lowest note in the chord.