Calculate Total Hours and Minutes from string variable using C# and VB.Net in ASP.Net

Hi nauna,

Refer below sample.

First you need to calculate total minutes from what time data you have. And then add both calulated total minute.

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    item.Text = "24:17".Replace(" hours ", ":").Replace("min", "").Replace("hour", ":").Replace("min", "");
    // Calculate total minutes.
    int itemTotalMinutes = (Convert.ToInt32(item.Text.Split(':')[0]) * 60) + Convert.ToInt32(item.Text.Split(':')[1]);
    lblholdingtime.Text = "25:59".Replace(" hours ", ":").Replace("min", "").Replace("hour", ":").Replace("min", "");
    // Calculate total minutes.
    int holdingtimTotalMinutes = (Convert.ToInt32(lblholdingtime.Text.Split(':')[0]) * 60) + Convert.ToInt32(lblholdingtime.Text.Split(':')[1]);
    // Calculate total minutes from both.
    int totalMinute = itemTotalMinutes + holdingtimTotalMinutes;
    // Convertint to Hours and minutes.
    Response.Write((totalMinute / 60) + " Hours : " + (totalMinute % 60) + " minutes");
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    item.Text = "24:17".Replace(" hours ", ":").Replace("min", "").Replace("hour", ":").Replace("min", "")
    Dim itemTotalMinutes As Integer = (Convert.ToInt32(item.Text.Split(":"c)(0)) * 60) + Convert.ToInt32(item.Text.Split(":"c)(1))
    lblholdingtime.Text = "25:59".Replace(" hours ", ":").Replace("min", "").Replace("hour", ":").Replace("min", "")
    Dim holdingtimTotalMinutes As Integer = (Convert.ToInt32(lblholdingtime.Text.Split(":"c)(0)) * 60) + Convert.ToInt32(lblholdingtime.Text.Split(":"c)(1))
    Dim totalMinute As Integer = itemTotalMinutes + holdingtimTotalMinutes
    Response.Write((totalMinute / 60) & " Hours : " & (totalMinute Mod 60) & " minutes")
End Sub

Output

50 Hours : 16 minutes