I'm new to date timepickers. I was wondering if someone could explain them to me properly. I have a booking system that you must be able to book a date and specific time in the future and reserve that time frame in a sql database. Can I do it with date timepickers? It has a nice interface when its on my form but I cant see a way for the user to set the time? it always just gives me the default time. Any help? thanks
http://imgur.com/arZPxA5
The DateTimePicker-Control has a Format-Property, which will set the format of the date and time displayed in the control.
AS stated in this answer you can use following format to show Date and time:
dateTimePicker1.Format = DateTimePickerFormat.Custom;
dateTimePicker1.CustomFormat = "MM.dd.yyyy hh:mm:ss";
Here you can get a list of all format string and their descriptions:
List of CustomFormat-String
The result will look like this:
.NET also has a structure called DateTime to save your selected value.
You can save it with following code
DateTime yourSelectedDateTime = dateTimePicker1.Value;
textBox1.Text = yourSelectedDateTime.ToString();
Date Time pickers are pretty useful to use when you want people to be able to visually select a date/time. once the user selects a datetime, you can access it like this
int mymonth = this.datetimepicker1.Value.Month
int myday = this.datetimepicker1.Value.day
etc...
Furthermore, you can use events to trigger when stuff happens with them. So for instance, they select a date, you can use the ValueChanged event to make other fun stuff happen too.
Related
How I will restrict a user to enter only max date of the previous entered date?
I want to enter only onward date and block backward date in SQL and c#.net in windowform?
In the blow image textbox "Auto Most Recent Date (Last Date)" is backward date and textbox "Enter Next Date" is onward date.
You clearly know how to query a database, so run a query like:
SELECT MAX(somedate) FROM courtcases WHERE casenumber = #whatever
And use the output of it on your date time picker
nextDateDateTimePicker.MinDate = <the DateTime you queried>
If the min date is a day later, use AddDays(1) on the date you queried
(Not that that looks like a standard win forms datetimepicker but I’m sure whatever you’re using will have a similar facility)
I don’t think you need to go to the extent of protecting your insert sql against hacking to ensure the user hasn’t modified the ui in some way and put an illegal date in
The max date accepted by Datetime data type in SQL Server and C# seems to be 31/12/9999 23:59:59. I have tried to assign a data value (01/01/9999 00:00:00) from database to a datetime picker. It failed saying
DateTimePicker does not support dates after 31/12/9998 00:00:00.
Parameter name: MaxDate
Now my question is when both the datatypes are compatible (datetime), why does these is restriction in Datetimepicker. This seems to be by design. Can any let me know why this restriction and how this feature in design is going to help?
Thank you
In normal operations the date time picker has to be able to display dates after the selected date. This means that if you selected the max date (31st Dec 9999) then theoretically it would have to display 1st Jan 10,000 - which it can't.
Therefore the picker itself restricts the initial value to be some arbitrary value before the max date so subsequent dates can be shown.
I don't see that this is a problem. When, in a real world application, is the user going to want to set a date 7000+ years in the future?
If your application has unset dates then perhaps you need to consider storing them as null in the database (i.e. make the column nullable) so that it's presented as a blank on the UI. This may actually make it easier for the user to spot dates that haven't been set.
It's as simple as that DateTimePicker checks against
DateTimePicker.MaximumDateTime
which is defined as december 31 9998
here's the relevant portion from the referencesource
public DateTime Value {
set {
bool valueChanged = !DateTime.Equals(this.Value, value);
// Check for value set here; if we've not set the value yet, it'll be Now, so the second
// part of the test will fail.
// So, if userHasSetValue isn't set, we don't care if the value is still the same - and we'll
// update anyway.
if (!userHasSetValue || valueChanged) {
if ((value < MinDate) || (value > MaxDate)) {
throw new ArgumentOutOfRangeException("Value", SR.GetString(SR.InvalidBoundArgument, "Value", FormatDateTime(value), "'MinDate'", "'MaxDate'"));
}
}
And MaxDate checks DateTimePicker.MaximumDateTime
http://referencesource.microsoft.com/#System.Windows.Forms/winforms/Managed/System/WinForms/DateTimePicker.cs,040fca665238ae30
I wanted to save only date in my database. There is a table which holds dates in database and the column which holds date in type of "Date". Now I want to store date from UI,so I placed WPF DatePicker in UI which allows to select date, but whenever I try to get the data from datepicker it shows the date and time.But I want just the dates to be stored in database.
This is the thing i am doing. It is demo code by the way. Can t upload original code. But this explains the thing. you can see in the message box, it shows 14-10-2015 00:00:00 , i want this zeros to be removed.
The dateTime Picker has a property DisplayDate of Type DateTime. This type contains date and time information.
Just use picker.DisplayDate.Date this returns a DateTime value with the TimeOfDay component set to 00:00.00
Edit
Usually you use an SQL Statement to insert or update values in the database. You should use a parametrized SQL statement with an parameter of type DateTime. The SQL API will take care of the conversion form DateTime (.Net type) to your SQL Date type and strip all time information away. It is a good idea to set the time component to 00:00:00 however to avoid any strange "roundings".
Use ToShortDateString() at the end something like:
var date = datePicker.SelectedDate.Value.Date.ToShortDateString();
MessageBox.Show(date.ToString());
I have this 21/10/1999 value manually inserted into the SQL database and when I retrieve it like this:
txtDOB.Text = readPatient["pDOB"].ToString();
It displays everything along with the time 12:00:00 AM. My data type for my date column is date, not datetime. So why is it displays the time as well?
((DateTime)readPatient["pDOB"]).ToString("d");
For a list of supported formats see: http://msdn.microsoft.com/es-es/library/zdtaw1bw(v=vs.110).aspx
You may try
txtDOB.Text = Convert.ToDateTime(readPatient["pDOB"]).ToString("dd/MM/yyyy", CultureInfo.InvariantCulture);
Edit: Thanks to comments saw that forgot to cast to datetime
It looks like you got your answer on how to properly format the value to a string without the time portion. But, no one has answered your other question:
So why is it displays the time as well?
This is because of mappings between SQL and .NET. In .NET a SQL "date" is stored in a DateTime object which does have time as well. To see all mappings between SQL and .NET see this: SQL Server Data Type Mappings
you can try this
txtDOB.Text=Convert.toDateTime(readPatient["pDOB"]).ToString("d/MM/yyyy");
You can use the string format parameter of the ToString to achieve any format you like,
like this:
TextBox1.Text =Convert.toDateTime(readPatient["pDOB"]).ToString("d/MM/yyyy");
Click on the datetimepicker then go to properties. There you can format your datetimepicker. Change format to custom (there few selection there) then set custom (provided in the properties menu) table with yy-MM-dd,an
DateTime dt = Convert.ToDateTime(sqdr["invdate"].ToString());
dt.Date; //To get the date only
Lots of troubles with DateTime fields today...
I have a DateTime field that I want to separate and display as a date in one DateTimePicker and a time in another DTP. This is what I tried:
dtp_date.Value = myRow.myDateTime.Date;
dtp_time.Value = myRow.myDateTime.TimeOfDay;
I'm getting an error that says it can't convert type 'System.TimeSpan' to 'System.DateTime'. I guess I just don't understand what I need to do differently. All it will do is display the time of day right now, not the one stored in my DateTime field.
Anyone know how to extract the time?
Try giving the DateTimePicker a valid date AND time. Hide the date on display and only show the time using DateTimePickerFormat.Time
DateTimePicker1.Value = new DateTime( DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, 5, 30, 0 )
Pop in your time values from the myRow.myDateTime field
You could set the CustomFormat property of your DateTimePicker control:
dtp_date.CustomFormat = CultureInfo.CurrentCulture.DateTimeFormat.ShortTimePattern;
dtp_date.Value = myRow.myDateTime;
That should show the time portion of your date.
Just create a New DateTime object with the values you need:
dtp_time.Value = new DateTime(0,0,0,myRow.myDateTime.Hour,myRow.myDateTime.Minute, myRow.myDateTime.Second);