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
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.
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);
This API has no official W3C or WHATWG specification.
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Chrome
Full support 13 |
Edge
Full support ≤79 |
Firefox
No support No |
IE
No support No |
Opera
No support No |
Safari
No support No |
WebView Android
No support No |
Chrome Android
Full support Yes |
Firefox Android
No support No |
Opera Android
No support No |
Safari iOS
No support No |
Samsung Internet Android
Full support Yes |
Legend
- Full support
- Full support
- No support
- No support
- Experimental. Expect behavior to change in the future.'
- Experimental. Expect behavior to change in the future.
- Non-standard. Expect poor cross-browser support.'
- Non-standard. Expect poor cross-browser support.
See also
- File and Directory Entries API
- Introduction to the File System API
Metadata
FileSystemEntry.getMetadata()
FileSystemFileEntry
Metadata.modificationTime by Mozilla Contributors is licensed under CC-BY-SA 2.5.