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There are 6470 days 5 hours left before the clock used by HFS and HFS+ expires on February 6, 2040 at 06:28:15

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

HFS and the Date & Time control panel from Mac OS 9.x 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 1904.[1][2] Since 2017, Apple has been migrating modern macOS users to its APFS file system, which does not have this limitation.[3]


  1. Why Do Older Macs Reset to 1904? by Jeff Adkins, Low End Mac. 2004-01-15.
  2. Solving Mac OS 8’s Y2K20 Bug by Josh Centers, TidBITS. 2020-01-03.
  3. Decoding the APFS file system by Kurt H. Hansen and Fergus Toolan, Norwegian Police University College. 2017-04-22. Revised 2017-06-21.

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