Step a calendar date string by whole days, independent of the host timezone.
new Date('2026-08-13T00:00:00') parses in the host's zone, so adding a
day and reformatting in the park's zone silently returns the same date on
any host east of that park. This anchors at noon UTC instead, which no
offset or DST shift can push across a date boundary.
Step a calendar date string by whole days, independent of the host timezone.
new Date('2026-08-13T00:00:00')parses in the host's zone, so adding a day and reformatting in the park's zone silently returns the same date on any host east of that park. This anchors at noon UTC instead, which no offset or DST shift can push across a date boundary.