Metadata: modificationTime property
Non-standard: This feature is not standardized. We do not recommend using non-standard features in production, as they have limited browser support, and may change or be removed. However, they can be a suitable alternative in specific cases where no standard option exists.
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
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.
Value
A Date timestamp indicating when the file system entry was last changed.
Examples
This example tries to get a particular working file at tmp/work-file.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/work-file.json",
{ create: true },
(fileEntry) => {
fileEntry.getMetadata((metadata) => {
if (
new Date().getFullYear() - metadata.modificationTime.getFullYear() >=
5
) {
fileEntry.remove(() => {
workingDirectory.getFile(
"tmp/work-file.json",
{ create: true },
(newEntry) => {
fileEntry = newEntry;
},
);
});
}
});
},
handleError,
);
Specifications
This feature has been removed from all specification and is not in the process of being standardized.
Browser compatibility
| desktop | mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
modificationTime
|
|
|
|
|
|
|
|
|
|
|
|
|
Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support
- No support
- No support
- Experimental. Expect behavior to change in the future.
- Non-standard. Check cross-browser support before using.