Metadata.modificationTime

This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

The read-only modificationTime property of the Metadata interface is a Date object which specifies the date and time the file system entry (or the data referenced by the entry) was last modified.A file system entry is considered to have been modified if the metadata or the contents of the referenced file (or directory, or whatever other kind of file system entry might exist on the platform in use) has changed.

Syntax

JavaScript
var modificationTime = Metadata.modificationTime;

Value

A Date timestamp indicating when the file system entry was last changed.

Example

This example tries to get a particular working file at tmp/workfile.json. Once that file has been found, its metadata is obtained and the file's modification timestamp year is compared to the current year. If it was last modified in a year at least five prior to the current year, the file is removed and a new one is created.

JavaScript
workingDirectory.getFile("tmp/workfile.json", { create: true }, function(fileEntry) {
  fileEntry.getMetadata(function(metadata) {
    if ((new Date().getFullYear() - metadata.modificationTime.getFullYear()) >= 5) {
      fileEntry.remove(function() {
        workingDirectory.getFile("tmp/workfile.json", { create: true }, function(newEntry) {
          fileEntry = newEntry;
        });
      });
    }
  });
}, handleError);

Specifications

Specification Status Comment
File and Directory Entries API
The definition of 'modificationTime' in that specification.		 Editor's Draft Initial specification.

This API has no official W3C or WHATWG specification.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 13 webkit No support No support No support No support
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support No support 0.16 webkit No support No support No support No support

See also

License

© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/api/metadata/modificationtime

API File and Directory Entries API File System API Files metadata modificationTime Non-Standard Non-standard offline Offline Property Reference