Ignore milliseconds when comparing two datetimes

Question

This is probably a dumb question, but I cannot seem to figure it out. I am comparing the LastWriteTime of two files, however it is always failing because the file I download

Answer 1

This is overkill for a single Truncate, but if you have several and of various types you could do this using the generalized Extension Method below:

DateTime dtSecs = DateTime.Now.TruncateTo(Extensions.DateTruncate.Second);
DateTime dtHrs  = DateTime.Now.TruncateTo(Extensions.DateTruncate.Hour);

More general Use Extension method:

    public static DateTime TruncateTo(this DateTime dt, DateTruncate TruncateTo)
    {
        if (TruncateTo == DateTruncate.Year)
            return new DateTime(dt.Year, 0, 0);
        else if (TruncateTo == DateTruncate.Month)
            return new DateTime(dt.Year, dt.Month, 0);
        else if (TruncateTo == DateTruncate.Day)
            return new DateTime(dt.Year, dt.Month, dt.Day);
        else if (TruncateTo == DateTruncate.Hour)
            return new DateTime(dt.Year, dt.Month, dt.Day, dt.Hour, 0, 0);
        else if (TruncateTo == DateTruncate.Minute)
            return new DateTime(dt.Year, dt.Month, dt.Day, dt.Hour, dt.Minute, 0);
        else 
            return new DateTime(dt.Year, dt.Month, dt.Day, dt.Hour, dt.Minute, dt.Second);

    }
    public enum DateTruncate
    {
        Year,
        Month,
        Day,
        Hour,
        Minute,
        Second
    }