Table of Contents

Enum ZipEntryTimestamp

Namespace
Ionic.Zip
Assembly
SunamoDotNetZip.dll

An enum that specifies the type of timestamp available on the ZipEntry.

[Flags]
public enum ZipEntryTimestamp
Extension Methods

Fields

DOS = 1

A DOS timestamp with 2-second precision.

InfoZip1 = 8

A Unix timestamp with 1-second precision, stored in InfoZip v1 format. This format is outdated and is supported for reading archives only.

None = 0

Default value.

Unix = 4

A Unix timestamp with 1-second precision.

Windows = 2

A Windows timestamp with 100-ns precision.

Remarks

The last modified time of a file can be stored in multiple ways in a zip file, and they are not mutually exclusive:

  • In the so-called "DOS" format, which has a 2-second precision. Values are rounded to the nearest even second. For example, if the time on the file is 12:34:43, then it will be stored as 12:34:44. This first value is accessible via the LastModified property. This value is always present in the metadata for each zip entry. In some cases the value is invalid, or zero.
  • In the so-called "Windows" or "NTFS" format, as an 8-byte integer quantity expressed as the number of 1/10 milliseconds (in other words the number of 100 nanosecond units) since January 1, 1601 (UTC). This format is how Windows represents file times. This time is accessible via the ModifiedTime property.
  • In the "Unix" format, a 4-byte quantity specifying the number of seconds since January 1, 1970 UTC.
  • In an older format, now deprecated but still used by some current tools. This format is also a 4-byte quantity specifying the number of seconds since January 1, 1970 UTC.

This bit field describes which of the formats were found in a ZipEntry that was read.

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