2040 date limit

The 2040 date limit is a forthcoming date-related software limitation in Apple's classic Hierarchical File System (HFS) and HFS Plus.

HFS Plus and the Date & Time control panel from Mac OS 9.0.4 to 9.2.2 can manage dates up to February 6, 2040 at 06:28:15, after which the clock defined by its epoch will cycle back to January 1, 1904. Since 2017, Apple has been migrating modern macOS users to its APFS file system, which does not have this limitation.