How to comapre 2 FILETIME variables to see if a file is older than 30 days

Question

I would like to check if a folder is greater that 30 days old and have the following code

static bool ExpiredDirectory(CComBSTR directory)
{
    WIN32_FILE_ATTRIBUTE_DATA fileAttrData = {0};
    GetFileAttributesEx(directory, GetFileExInfoStandard, &fileAttrData);

    FILETIME ftCreatedDate = fileAttrData.ftCreationTime;
    FILETIME now;
    SYSTEMTIME nowst;
    ULARGE_INTEGER t1, t2;
    GetSystemTime(&nowst);
    SystemTimeToFileTime(&nowst, &now);

      ---compare code goes here

}

I want to compare the variables above to see if ftCreatedDate is greater than 30 days old

Thanks but comparefiletime only compare and says which of the 2 is largest. Im wanting to check the scale also e.g is it greater than 30 days old — John, May 02 '13 at 14:28
True, but the title didn't mention the 30 days bit, so others with the same problem won't know that this question actually is the same as theirs. — Raymond Chen, May 02 '13 at 14:43
Thats a good point I have amended the title to avoid confussion — John, May 02 '13 at 15:57

score 1 · Accepted Answer · edited May 23 '17 at 11:51

1

ive fixed the problem with help from 30 days Difference on SYSTEMTIME. Turns out this guy wanted to do almost the same. Should have seen this before

My code is now

WIN32_FILE_ATTRIBUTE_DATA fileAttrData = {0};
GetFileAttributesEx(directory, GetFileExInfoStandard, &fileAttrData);
FILETIME ftCreationTime = fileAttrData.ftCreationTime;
FILETIME now;
SYSTEMTIME nowst;
ULARGE_INTEGER t1, t2;

GetSystemTime(&nowst);
SystemTimeToFileTime(&nowst, &now);

memcpy(&t1, &ftCreationTime, sizeof(t1));
memcpy(&t2, &now, sizeof(t1));
ULONGLONG diff = (t1.QuadPart<t2.QuadPart)?(t2.QuadPart-t1.QuadPart):(t1.QuadPart-t2.QuadPart);

if(diff>30*24*60*60*(ULONGLONG)10000000)
{
    return true;
}

return false;

edited May 23 '17 at 11:51

Community

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answered May 02 '13 at 14:32

John

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Note that this also detects files created less than 30 days in the future. – Raymond Chen May 02 '13 at 14:42
1

Because of the second half of the `t1.QuadPart – Raymond Chen May 02 '13 at 17:15

How to comapre 2 FILETIME variables to see if a file is older than 30 days

1 Answers1