HFS/HFS+ timestamp - Revision history

Jsummers: Category:Date and time formats

2017-07-23T15:00:28Z

Category:Date and time formats

Jsummers at 13:36, 20 July 2017

2017-07-20T13:36:58Z

Jsummers: Created page with "{{FormatInfo |formattype=electronic |subcat=Elements of File Formats |released=~1985 }} '''HFS/HFS+ timestamp''' is a timestamp format associated with the HFS and HFS+..."

2017-07-19T16:48:33Z

Created page with "{{FormatInfo |formattype=electronic |subcat=Elements of File Formats |released=~1985 }} '''HFS/HFS+ timestamp''' is a timestamp format associated with the HFS and HFS+..."

New page

{{FormatInfo
|formattype=electronic
|subcat=Elements of File Formats
|released=~1985
}}
'''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).

It has been called by many other names, including '''Apple timestamp''', '''Mac OS timestamp''', and '''HFS time'''; 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 can represent 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). Reportedly, it is in local time for HFS, and UTC for HFS+.

In UTC, it differs from [[Unix time]] by 2082844800.

== Links ==
* [https://www.epochconverter.com/mac EpochConverter: Mac HFS+ Timestamp Converter]
* [[Wikipedia: Epoch (reference date)]] - Search for "January 1, 1904", for examples of things that might use this format or a similar format

[[Category:Macintosh]]

← Older revision		Revision as of 15:00, 23 July 2017
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	* [[Wikipedia: Epoch (reference date)]] - Search for "1904", for examples of things that might use this format or a similar format		* [[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]]

@@ Line 4: / Line 4: @@
 |released=~1985
 }}
-'''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 has been called by many other names, including '''Apple timestamp''', '''Mac OS timestamp''', and '''HFS time'''; though confusion may exist due to conflation of timestamp ''formats'' with timestamp ''epochs''.
+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 can represent dates from about 1904-01-01 to 2040-02-06.
+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). Reportedly, it is in local time for HFS, and UTC for HFS+.
+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+.
-In UTC, it differs from [[Unix time]] by 2082844800.
+If it is in UTC, it differs from [[Unix time]] by 2082844800.
 == Links ==
 * [https://www.epochconverter.com/mac EpochConverter: Mac HFS+ Timestamp Converter]
-* [[Wikipedia: Epoch (reference date)]] - Search for "January 1, 1904", for examples of things that might use this format or a similar format
+* [[Wikipedia: Epoch (reference date)]] - Search for "1904", for examples of things that might use this format or a similar format
 [[Category:Macintosh]]