A threshold is a number and a unit: s, m, h, d, w, mo, or y. Write none to keep a date relative at any distance. Anything else is ignored, and the date uses the default threshold.
Incorrect
Opened .
Opened :time[2026-09-30]{threshold="a month"}.Correct
Opened .
Opened :time[2026-09-30]{threshold="6w"}.