HFS/HFS+ timestamp
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| − | '''HFS/HFS+ timestamp''' is a timestamp format associated with the [[HFS]] and [[HFS+]] filesystems, and classic Macintosh computers. It appears in some file formats, for example [[ZIP]] extensible data field 0x334d (Info-ZIP Macintosh). | + | '''HFS/HFS+ timestamp''' is a timestamp format (or, two variants of a timestamp format) associated with the [[HFS]] and [[HFS+]] filesystems, and classic Macintosh computers. It appears in some file formats, for example [[ZIP]] extensible data field 0x334d (Info-ZIP Macintosh). |
| − | It | + | It may be called by other names, including '''Apple timestamp''' and '''Mac OS timestamp'''; though confusion may exist due to conflation of timestamp ''formats'' with timestamp ''epochs''. |
It is the number of (non-leap) seconds since the beginning of 1904. This date is the standard epoch for classic Macintosh computers. | It is the number of (non-leap) seconds since the beginning of 1904. This date is the standard epoch for classic Macintosh computers. | ||
| − | It is usually stored as a 32-bit unsigned integer, in which case it | + | It is usually stored as a 32-bit unsigned integer, in which case it supports dates from about 1904-01-01 to 2040-02-06. |
| − | It could be in universal time (UTC), or in local time (perhaps with a separate field for the timezone offset). | + | It could be in universal time (UTC), or in local time (perhaps with a separate field for the timezone offset). It is normally in local time for HFS, and UTC for HFS+. |
| − | + | If it is in UTC, it differs from [[Unix time]] by 2082844800. | |
== Links == | == Links == | ||
* [https://www.epochconverter.com/mac EpochConverter: Mac HFS+ Timestamp Converter] | * [https://www.epochconverter.com/mac EpochConverter: Mac HFS+ Timestamp Converter] | ||
| − | * [[Wikipedia: Epoch (reference date)]] - Search for " | + | * [[Wikipedia: Epoch (reference date)]] - Search for "1904", for examples of things that might use this format or a similar format |
| + | [[Category:Date and time formats]] | ||
[[Category:Macintosh]] | [[Category:Macintosh]] | ||
Latest revision as of 15:00, 23 July 2017
HFS/HFS+ timestamp is a timestamp format (or, two variants of a timestamp format) associated with the HFS and HFS+ filesystems, and classic Macintosh computers. It appears in some file formats, for example ZIP extensible data field 0x334d (Info-ZIP Macintosh).
It may be called by other names, including Apple timestamp and Mac OS timestamp; though confusion may exist due to conflation of timestamp formats with timestamp epochs.
It is the number of (non-leap) seconds since the beginning of 1904. This date is the standard epoch for classic Macintosh computers.
It is usually stored as a 32-bit unsigned integer, in which case it supports dates from about 1904-01-01 to 2040-02-06.
It could be in universal time (UTC), or in local time (perhaps with a separate field for the timezone offset). It is normally in local time for HFS, and UTC for HFS+.
If it is in UTC, it differs from Unix time by 2082844800.
[edit] Links
- EpochConverter: Mac HFS+ Timestamp Converter
- Wikipedia: Epoch (reference date) - Search for "1904", for examples of things that might use this format or a similar format
