`timeZone` causes bad performance due to slow re-renders

Author: mciudoiuCreated Nov 11, 2025Updated Mar 18, 2026
Labelstime zone

Using timeZone significantly affects performance slowing down re-renders by up to 15x. Having some disabled dates and modifiers additionally increases this time.

To reproduce

CodeSandbox: https://codesandbox.io/p/sandbox/daypicker-bug-report-forked-8lrc7t

Actual Behavior

Re-renders are very slow.

Expected Behavior

Be as fast as when not using timeZone.