File.lastModified() problem

[idarke]

I have a file on my local drive (Windows 2000) with a last modified date/time of Jan 30, 2005 12:09:34 AM.

When I create a File object for that file today, call lastModified() and make a Date object from it, the result is Jan 29, 2005 23:09:34 PM - one hour earlier.

It seems to be making some sort of unnecessary adjustment for daylight savings time. I tried creating a TimeZone object for "US/Eastern" and using a Calendar object set to that time zone to create the date, but it didn't help.

I tried it on a file created today (we are on daylight time now), and it gets the correct date/time with no problem.

Does anyone have any experience with this bug? How can I get the actual date/time from the File object?

 

[Bong]

maybe Calendar.setRawOffset?

abstract void setRawOffset(int offsetMillis)
Sets the base time zone offset to GMT.

_________________
Bob Rashkin
rrashkin@csc.com

 

[idarke]

Thanks for the suggestion. I didn't find setRawOffset on the Calendar object, but I did find one on the TimeZone object. That led me to try creating a SimpleTimeZone with no daylight savings time settings, but that had no effect.

Here's what I tried:

long tm = f.lastModified();
TimeZone tz = TimeZone.getTimeZone("US/Eastern");
SimpleTimeZone stz = new SimpleTimeZone(tz.getRawOffset(), "US/Eastern");    
GregorianCalendar cal = new GregorianCalendar(stz);
cal.setTimeInMillis(tm);
jav.util.Date timeStamp = cal.getTime();

I'm beginning to think this is a bug in the interface between the JRE and the windows file system.

 

[idarke]

I figured out a workaround for the problem. After getting the Date object as above, I check to see if that date is within daylight savings time, and if it isn't, I add an hour to it.

Here's the full handling:

long tm = f.lastModified();
TimeZone tz = TimeZone.getTimeZone("US/Eastern");
GregorianCalendar cal = new GregorianCalendar(tz);
cal.setTimeInMillis(tm);
java.util.Date timeStamp = cal.getTime();
if (!tz.inDaylightTime(timeStamp))
{
   cal.add(Calendar.HOUR,1);
   timeStamp = cal.getTime();         
}