Move the interactive clock to see when setting the date is safer — and when most mechanical watches are in the danger zone.
Move the hands to around 6:00, set the date, then set the time. This keeps most movements away from the midnight date-change engagement.
Near midnight, the date mechanism is already preparing to change. Forcing a date set in that window can stress gears and, in some cases, damage the date works.
What hours are unsafe to set the date? Many watches are most sensitive from late evening through the early morning date-change window. Exact hours vary by movement.
Is 9 to 3 always the rule? It is a common practical warning range, not a universal engineering constant for every calibre.
What is the safest method? Set the watch near 6:00, change the date, then set the correct time.
What if my date is already stuck? Do not force it. Have the movement inspected if it will not advance normally.