Finding the Last Modified Date on a File
This question came up on my local CFUG mailing list yesterday:
how can I get the time last updated of the two documents? I know you can do this with uploaded files using FILE.TimeLastModified. Is there anyway to do it with existing files? I know I could do a hack with CFDIRECTORY where I loop through the files in the directory looking for the one I'm interested in and then getting the dateLastModified on that, but I'm thinking there has to be a more direct way.
You can use java's File class to get the lastModified timestamp:
<cfset myFile = CreateObject("java", "java.io.File")>
<cfset myFile.init("/path/to/file")>
<cfset last_modified = myFile.lastModified()>
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Comments
On 01/11/2007 at 2:33:30 PM EST Sam Farmer wrote:
1
Thats a great solution.
There is also the filter attribute to cfdirectory that would negate the need to loop over and look for the file. Still I think the Java File solution is better.
On 01/11/2007 at 3:45:50 PM EST Elliott wrote:
2
If you don't want to be dependent on Java you can use <cfdirectory>, specify a filter that is the file name and a query of queries on the result to match the actual file (fix due to wildcards in file name).
No need to loop. :)
Its slower, but more portable.
On 01/11/2007 at 3:59:22 PM EST Sam wrote:
3
Well, you don't exactly have to loop through it. Can't you just query it?
On 06/15/2007 at 8:53:24 AM EDT Navin wrote:
4
Hi
I want to display last modified date in HTML page.
On 07/26/2007 at 11:00:14 AM EDT Patrick Whittingham wrote:
5
Do I use the absolute path (ie., d:/..a.js) and I'm getting a number (ie., 1178038419822 ). Why?
On 02/20/2008 at 7:48:06 PM EST bruce wrote:
6
you may try this: File file = new File(filename); long time = file.System.currentTimeMillis(); boolean success = file.setLastModified(newModifiedTime); if (!success) {...} // operation failed.
On 04/17/2008 at 2:44:20 PM EDT Kevin penny wrote:
7
Documentation says: Returns the time that the file denoted by this abstract pathname was last modified.
Returns: A long value representing the time the file was last modified, measured in milliseconds since the epoch (00:00:00 GMT, January 1, 1970), or 0L if the file does not exist or if an I/O error occurs
I suppose you'd have to compare it at the ms level in that case -
<cfset y = datediff('s','00:00:00 January 1, 1970',now())*1000/>
On 04/17/2008 at 3:32:12 PM EDT Kevin Penny wrote:
8
Actually, this works better as it takes into account your local timezone difference between your server and GMT.
<cfset y = datediff('s',LSParseDateTime('January 1, 1970 00:00:00 AM GMT'),now())*1000/>
This will convert the Base Jan 1970 time into MS where you can then use simple math to do your comparisons at the MilliSeconds level.
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There is also the filter attribute to cfdirectory that would negate the need to loop over and look for the file. Still I think the Java File solution is better.
No need to loop. :)
Its slower, but more portable.
I want to display last modified date in HTML page.
Returns: A long value representing the time the file was last modified, measured in milliseconds since the epoch (00:00:00 GMT, January 1, 1970), or 0L if the file does not exist or if an I/O error occurs
I suppose you'd have to compare it at the ms level in that case -
<cfset y = datediff('s','00:00:00 January 1, 1970',now())*1000/>
<cfset y = datediff('s',LSParseDateTime('January 1, 1970 00:00:00 AM GMT'),now())*1000/>
This will convert the Base Jan 1970 time into MS where you can then use simple math to do your comparisons at the MilliSeconds level.
