比较两个日期，一个来自数据库，另一个来自datetime.now

Question

I have a gridview and I would like to highlight the days which has difference > 10.

What I have now

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            DateTime dateNow = DateTime.Now;
            string dateCreated = e.Row.Cells[5].Text;

            DateTime dc = Convert.ToDateTime(dateCreated);
            TimeSpan difference = dateNow - dc;

            if (difference.TotalDays > 0)
            {
                e.Row.BackColor = System.Drawing.Color.Cyan; // This will make row back color red
            }
        }
    }

Date format of the one saved onto my database is dd-MM-YYYY and it is saved as nvarchar.

Answer 1

您应该这样解析DateTime：

DateTime dc = DateTime.ParseExact(dateCreated, "dd-MM-yyyy", CultureInfo.InvariantCulture);

Answer 2

Victor Leontyev is right on with the parsing. But then you also have to tweak you logic:

if (difference.TotalDays > 0)

to

if (Math.Abs(difference.TotalDays) > 10)

Answer 3

Use this:

int minutes = (int)DateTime.Now.Subtract(dc).TotalMinutes;

or days

int days = (int)DateTime.Now.Subtract(dc).TotalDays;

Or seconds, miliSeconds, Weeks, ....

To get date from your string do this:

string dateCreated = "01-01-2017";
string[] dcArray = dateCreated.Split('-');
DateTime dc = new DateTime(int.Parse(dcArray[2]), int.Parse(dcArray[1]), int.Parse(dcArray[0]));