How to change the default time of date time picker from 12:00AM in wpf

Question

<etk:DateTimePicker Name="dtFromSlot" Margin="0,0,5,5" Height="24" Value="{Binding LPSearch.LoadingTimeFrom}"> 

Answer 1

Have you tried setting

LoadingTimeFrom = YourDefaultDateTime;

When you new up whatever the datacontext is.

Either that or set the TargetNullValue in the binding.

You will need

xmlns:sys="clr-namespace:System;assembly=mscorlib"

and something like

<etk:DateTimePicker Name="dtFromSlot" Margin="0,0,5,5" Height="24" Value="{Binding LPSearch.LoadingTimeFrom, TargetNullValue='{x:Static sys:DateTime.Today}'}">

Answer 2

Hi Andy this is what I tried

public DateTime LoadingTimeFrom
        {
            get { return _LoadingTimeFrom; }
            set
            { 
                _LoadingTimeFrom = value;
                _LoadingTimeFrom = _LoadingTimeFrom.AddHours(6);
                RaisePropertyChanged("LoadingTimeFrom");
            }
        }

LoadingTimeFrom = DateTime.Today.AddDays(-1);

But the problem is everytime I click next time it jumps 6 hours. 



Answer 3

I actually want to change the default time from 12:00:00AM to 6:00:00AM

Answer 4

If you want to change the increment for time as you click then there's some code on codeplex:

https://wpftoolkit.codeplex.com/discussions/355784

Your code is the problem - as soon as you set it, it'll add 6 hours.

You want something more like

private DateTime _LoadingTimeFrom  = DateTime.Today.AddHours(6); 

public DateTime LoadingTimeFrom
         {
             get { return _LoadingTimeFrom; }
             set
             { 
                 _LoadingTimeFrom = value;

                 RaisePropertyChanged("LoadingTimeFrom");
             }
         }

Answer 5

I tried this "private DateTime _LoadingTimeFrom  = DateTime.Today.AddHours(6);" and its default to 6:00AM but if you click on date again it will go back to 12:00AM

Answer 6

So the default time is working.

Did you follow the link?

https://wpftoolkit.codeplex.com/discussions/355784

Answer 7

May be you can try something like this.

public DateTime LoadingTimeFrom
        {
            get { return _LoadingTimeFrom; }
            set
            { 
                _LoadingTimeFrom = value;
                 if (_LoadingTimeFrom = new DateTime())
                 {
                    _LoadingTimeFrom = _LoadingTimeFrom.AddHours(6);
                 }
                
                RaisePropertyChanged("LoadingTimeFrom");
            }
        }

---

Gaurav Khanna | Microsoft VB.NET MVP | Microsoft Community Contributor

That's a direct copy of the code I posted.

Answer 8

Try following code change to "Andy ONeill" code

private DateTime _LoadingTimeFrom = DateTime.Today.AddHours(6);

        public DateTime LoadingTimeFrom
        {
            get { return _LoadingTimeFrom; }
            set
            {
                _LoadingTimeFrom = value;
                if (_LoadingTimeFrom.TimeOfDay == new TimeSpan())
                {
                    _LoadingTimeFrom = _LoadingTimeFrom.AddHours(6);
                }
                RaisePropertyChanged("LoadingTimeFrom");
            }
        }

---

Gaurav Khanna | Microsoft VB.NET MVP | Microsoft Community Contributor

Answer 9

That won't work.

When the user decrements it'll go up 6 hours from the original.

When they pick a date.

It'll be ignored and it'll go up 6 hours from the original.

Answer 10

Hi,

Currently, there is no DateTimePicker control in native Wpf, looks like that you are using a third-party control, for instance, this one: https://wpftoolkit.codeplex.com/

If so, this control has a propery named DefaultValue, you can set defaule datetime as you like:

<xctk:DateTimePicker HorizontalAlignment="Left"
      Margin="10,100,0,0" VerticalAlignment="Top" DefaultValue="06/29/2014 06:00:00"/>

Screenshot:

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Answer 11

I spent some time looking into this.

Using the datetimepicker in this way is going to be pretty tricky.

I would suggest you instead use two controls:

A DatePicker and a TimePicker

https://wpftoolkit.codeplex.com/wikipage?title=TimePicker

Then put the two together.

You can easily default the TimePicker time to 6am.

I would suggest setting the starttime property to 6am.

Bind the DatePicker to Dated, the TimePicker to JustTime and you get the two together in FullDateTime:

        private DateTime fullDateTime;

        public DateTime FullDateTime
        {
            get { return fullDateTime; }
            set 
            { 
                fullDateTime = value; 
            }
        }
        
        private DateTime dated;

        public DateTime Dated
        {
            get { return dated; }
            set 
            { 
                dated = value;
                fullDateTime = Dated.Add(JustTime.TimeOfDay);
            }
        }

        private DateTime justTime;

        public DateTime JustTime
        {
            get { return justTime; }
            set 
            { 
                justTime = value;
                fullDateTime = Dated.Add(JustTime.TimeOfDay);
            }
        }