CODEWITHSUNDEEP
c#
bala3569
bala3569

Reputation: 11010

How to compare two files based on datetime?

I need to compare two files based on datetime. I need to check whether these two files were created or modified with same datetime. I have used this code to read the datetime of files...

string fileName = txtfile1.Text;
var ftime = File.GetLastWriteTime(fileName).ToString();
string fileName2 = txtfile2.Text;
var ftime2 = File.GetLastWriteTime(fileName2).ToString();

Any suggestions?

Upvotes: 7

Views: 18035

Answers (5)

user8276908
user8276908

Reputation: 1061

The precision of the last modification time being stored in a file system varies between different file systems (VFAT, FAT, NTFS). So, its best to use an epsillon environment for this and either let the user choose a sensible value or choose a value based on the involved file systems.

https://superuser.com/questions/937380/get-creation-time-of-file-in-milliseconds

double epsillon = 2.0
DateTime lastUpdateA = File.GetLastWriteTime(filename);
DateTime lastUpdateB = File.GetLastWriteTime(filename2);

if (Math.Abs(Math.Round((lastUpdateA - lastUpdateB).TotalSeconds)) > epsillon)
 different = true;

Upvotes: 2

ZeroKool
ZeroKool

Reputation: 20

bool isMatched=false;
int ia = string.Compare(ftime.ToString(), ftime2.ToString());
if (string.Compare(ftime.ToString(), ftime.ToString()) == 0)
    isMatched = true;
else
    isMatched = false;

Upvotes: -3

Ferruccio
Ferruccio

Reputation: 100718

GetLastWriteTime() returns a DateTime object, so you can do this:

if (File.GetLastWriteTime(filename).CompareTo(File.GetLastWriteTime(filename2)) == 0)

to test if they have the same timestamp.

See this for more tips on comparing DateTime objects.

Upvotes: 1

Donut
Donut

Reputation: 112855

Don't call ToString() on the DateTime values returned by GetLastWriteTime(). Do this instead:

DateTime ftime = File.GetLastWriteTime(fileName);
DateTime ftime2 = File.GetLastWriteTime(fileName2);

Then you can just compare ftime and ftime2:

if (ftime == ftime2)
{
   // Files were created or modified at the same time
}

Upvotes: 18

Matti Virkkunen
Matti Virkkunen

Reputation: 65156

Well, how about doing

ftime == ftime2

? No need for the ToString though, better just compare DateTimes as-is.

Upvotes: 2

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