milliseconds*4

ProDOSの日時

[541] ProDOS日時形式

[6] 関連: 西暦2000年問題

[544] ProDOS 2.5 Alpha 8, , https://prodos8.com/releases/prodos-25/

[3] >>544

Year has been expanded from 7-bits (127 years) to 10-bits (1,024 years) to allow date support until the year 2924. There is still a year 2040 problem where the 24-bit timer on the Apple IIgs will wrap around to 1900.

[5] >>544

year = 0-4095

[2] >>544

[1] >>544

milliseconds*4

milliseconds = 0-249

[4] >>544

month = 2-13

    month +1 keeps top 3 bits from being 0,
    differentiating it from pre-2.5 format