Holiday Array output has incorrect day

[firefighterchuck]

The Holiday Array output from this node has the wrong date in the date and the dateISOString values. In this example, the Holiday is entered as -21 days relative to the 4th Sunday in Advent. For 2020, the date should be 2020-11-29, and this shows correctly in the id, day, and natural month values, but not in the date and the dateISOString values:

This contrasts with the values in the payload.today object, which show correctly (screenshot was taken on 2020-12-01);

[Hypnos3]

The ISO string is in UTC time zone (There is a Z at the end, which means UTC).
The Day is calculated for the local time.

for the first pisture the rtimes are:
Your local time is: 11/29/2020 @ 5:00am (parameter ts is 1606626000)
Your UTC time is: 11/30/2020 @ 12:00am (parameter tsUTC is 1606694400)

So for the calculation the local time is used, where the day_id comes from.