How to use Timer in Xamarin Forms

Question

Hi Techie,
I have a requirement to add the timer in the App, this timer will take the current time, Whenever I open the app it will display the difference of current time and opened the app today's time . How I can achieve this .

Answer 1

Hello,​

Welcome to our Microsoft Q&A platform!

Please try to this code: MyLabel.Text = DateTime.Now.TimeOfDay.ToString();

If you want to remove end of date, you can use

   string str=DateTime.Now.TimeOfDay.ToString();  
     
             var s=  str.Substring(0,str.Length-8);  

=====================
Update=======================

Do you want to achieve it like this screenshot?(The displayed time is 11 hours later than the current one)

If so, you can achieve it like this code.

   string str = DateTime.Now.AddHours(-11).TimeOfDay.ToString();  
               var s = str.Substring(0, str.Length - 8);  
               mylabel.Text = s;  

Best Regards,

Leon Lu

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Answer 2

@Vasanthakumar M Do you want to achieve the result like this?

My time is 15.50 now, so this differentiated time is 17 hours.

You can change the endtime by yourself. Then it will cacluate the countdown time automatically.

   public partial class MainPage : ContentPage  
       {  
     
           DateTime endTime = new DateTime(2021, 4, 17, 9, 0, 0);  
           public void StartCountDownTimer()  
           {  
               timer = new System.Timers.Timer();  
               timer.Interval = 1000;  
               timer.Elapsed += t_Tick;  
               TimeSpan ts = endTime - DateTime.Now;  
               cTimer = ts.ToString("d' Days 'h' Hours 'm' Minutes 's' Seconds'");  
               timer.Start();  
           }  
           string cTimer;  
           System.Timers.Timer timer;  
           void t_Tick(object sender, EventArgs e)  
           {  
               TimeSpan ts = endTime - DateTime.Now;  
     
                
               cTimer = ts.ToString("h':'m':'s' '");  
     
               MainThread.BeginInvokeOnMainThread(() =>  
               {  
                   // Code to run on the main thread  
                   mylabel.Text = cTimer;  
               });  
     
               if ((ts.TotalMilliseconds < 0) || (ts.TotalMilliseconds < 1000))  
               {  
                   timer.Stop();  
               }  
           }  
     
           public MainPage()  
           {  
               InitializeComponent();  
               StartCountDownTimer();  
     
              
           }  
       }  
   }  

My layout like following xaml.

   <StackLayout>  
     
           <Label x:Name="mylabel"></Label>  
       </StackLayout>