how do i set the starting time of the time interval, let's say i would like to start the 5 sec interval counting after 10 seconds. I'm having a problem with my logic can you help me with this? this is my code:
This is my timer in my Form1
Private Sub Timer2_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer2.Tick
If DateTime.Now = Form3.DateTimePicker1.Value Then
Timer2.Stop()
MsgBox("hey")
Timer2.Start()
End If
This is the OK button in my Form3
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
Form1.Timer2.Interval = New TimeSpan(CInt(NumericUpDown3.Value), CInt(NumericUpDown2.Value), CInt(NumericUpDown1.Value)).TotalMilliseconds
Form1.Timer2.Start()
End If
It seems to work successfully with the intervals without setting the start of the interval, But if i add the start time of the interval, it doesn't seem to work. with this code If DateTime.Now = Form3.DateTimePicker1.Value Then what could be wrong?
This seems to be bad idea:
If DateTime.Now = Form3.DateTimePicker1.Value Then
Because it is extremely hard for you to catch the time exactly as you specify. Simply change = to >=
If DateTime.Now >= Form3.DateTimePicker1.Value Then
Then when you reach the time or later, you would show your message box.
Related
I need to know the value of time. I mean the interval of time; from starting time to ending time. Anyone can help? :(
This is my list and I want to get the interval value of time.
When I select the item/record in the Datagridview2 it will displayed here
Can somebody share an idea/or code? Thanks
To achieve something like this, you need the TimeSpan data type.
In my example, a variable is written with the current time at the beginning of the runtime.
A timer regularly calculates the new time span between time 1 and the current time, and outputs this time span in a text box.
Also, I use CultureInfo (I always do, don't be surprised) and I use PadLeft to have leading zeros. Looks nicer.
Public Class FormMain
Private ReadOnly Starttime As Date = Date.Now
Private ReadOnly Deu As New System.Globalization.CultureInfo("de-DE")
Private Sub FormMain_Load(sender As Object, e As EventArgs) Handles MyBase.Load
End Sub
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Timer1.Start()
End Sub
Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
Dim TS As TimeSpan = Date.Now - Starttime
TextBox1.Text = TS.Minutes.ToString(Deu).PadLeft(2, "0"c) & ":" & TS.Seconds.ToString(Deu).PadLeft(2, "0"c)
End Sub
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
Timer1.Stop()
End Sub
End Class
My program displays the current date and time and must be accurate, and I need to prevent users from changing the time. Here's what I tried.
On form load I query the current date and time of the server and change the local system time to what I got.
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
cmd = New SqlCommand("Select getdate()", con)
serverdatetime = cmd.ExecuteScalar
Microsoft.VisualBasic.TimeOfDay = serverdatetime
Microsoft.VisualBasic.DateAndTime.Today = serverdatetime
TimeKeeper.Start()
End Sub
Now I tried 2 ways of displaying the time, the first one, since I adjusted the system time to what I got from the server, I just get my time from the local system. But the time on my program can easily be changed by changing the system time.
Private Sub TimeKeeper_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TimeKeeper.Tick
lblDate.Text = DateTime.Now.Date()
lblTime.Text = DateTime.Now().ToString("HH:mm:ss")
End SUb
Second thing, I just take the time I got from the server and increment it every second.
Private Sub TimeKeeper_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TimeKeeper.Tick
serverdatetime = serverdatetime.AddSeconds(1)
lblDate.Text = serverdatetime.Date()
lblTime.Text = serverdatetime.ToString("HH:mm:ss")
End SUb
I thought it worked great except it seems to get delayed once I do some operations in the system(I guess because some other code is running, my timer doesn't execute its code) and the more I do the more it gets delayed, after a few testing of the program the server time was already 10 seconds ahead of the time I have in my program.
So, how can I achieve what I need?
You cannot rely on Tick event of the Timer. I would use the StopWatch class to get duration passed (since when server time is read) independent from the system time adjustments.
Dim stopWatch As StopWatch = new StopWatch()
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
cmd = New SqlCommand("Select getdate()", con)
serverdatetime = cmd.ExecuteScalar
stopWatch.Start()
TimeKeeper.Start()
End Sub
Private Sub TimeKeeper_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TimeKeeper.Tick
Dim currentDate As DateTime = serverdatetime.Add(stopWatch.Elapsed)
lblDate.Text = currentDate.Date()
lblTime.Text = currentDate.ToString("HH:mm:ss")
End SUb
This is the scenario, I have three NumericUpDown for the values of second, minute and hour, And if a number is entered in the NumericUpDown i.e. 5, it will be converted to 5000 ms so my Timer can read it as 5 seconds. I'm trying to make a scheduler for every interval and this is my code:
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Label13.Text = TimeSpan.FromSeconds(Form3.NumericUpDown1.Text).TotalMilliseconds
Label14.Text = TimeSpan.FromMinutes(Form3.NumericUpDown2.Text).TotalSeconds
Label15.Text = TimeSpan.FromHours(Form3.NumericUpDown3.Text).TotalMinutes
Dim times() As String = {Label13.Text, Label14.Text, Label15.Text}
For Each time In times
Dim interval As TimeSpan = TimeSpan.Parse(time)
Timer1.Interval = interval
MsgBox("hey")
Next
End Sub
And it has an error at Timer1.Interval = interval that says Timespan cannot be converted to Integer, and i can't think of any way to fix this, can you help me out? TIA~!
Try This
Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
Timer1.Stop()
Timer1.Interval = New TimeSpan(0, 0, CInt(nudMinutes.Value), CInt(nudSeconds.Value), CInt(nudMilliseconds.Value)).TotalMilliseconds
Timer1.Start()
End Sub
Here are some ideas to get you past your current error.
Dim tsTest As TimeSpan = TimeSpan.FromSeconds(NumericUpDownTest.Value)
Label1.Text = tsTest.TotalSeconds.ToString("n0")
Timer1.Interval = CInt(tsTest.TotalMilliseconds)
Start with just doing seconds and when that code works see if you can add the others.
I have my timer code displaying the time correctly on my program, and I want to trigger an event to happen at a 6:31. How do I get the program to preform a button click or trigger the event that the button handles. The program works when I run and press the button, but I want it to happen automatically at 6.31 without me pressing it. Thanks!
Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
Timer1.Enabled = True
End Sub
Private Sub Timer1_Tick(sender As System.Object, e As System.EventArgs) Handles Timer1.Tick
Label1.Text = Date.Now.ToString("hh:mm:ss")
End Sub
In your Tick event:
Dim now As DateTime = DateTime.Now
If (18 = now.Hour) AndAlso (31 = now.Minute) Then
' Change 18 to 6 is you want AM instead of PM
' Do something here
End If
This is the naive version. Your question is lacking in details so I did not elaborate on the code.
At a minimum you may need to ensure that once the "event" happens it can't happen again.
I'm trying to build a Break tracker for work and I would like to get a button to display the Current Time in a label. I have tried multiple solutions and this is how far I have gotten.
Sub AddButtonClick(sender As Object, e As EventArgs)
Dim Start as Integer
System.DateTime.Now = Start
total.Text = Start
End Sub
When I do this, I get the error that Property 'Now' is read only.
There are several problems here:
Your assignment is the wrong way round; you're trying to assign a value to DateTime.Now instead of Start
DateTime.Now is a value of type DateTime, not Integer, so the assignment wouldn't work anyway
There's no need to have the Start variable anyway; it's doing no good
total.Text is a property of type String - not DateTime or Integer
(Some of these would only show up at execution time unless you have Option Strict on, which you really should.)
You should use:
total.Text = DateTime.Now.ToString()
... possibly specifying a culture and/or format specifier if you want the result in a particular format.
Try This.....
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Timer1.Start()
End Sub
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Label12.Text = TimeOfDay.ToString("h:mm:ss tt")
End Sub
try
total.Text = DateTime.Now.ToString()
or
Dim theDate As DateTime = System.DateTime.Now
total.Text = theDate.ToString()
You declare Start as an Integer, while you are trying to put a DateTime in it, which is not possible.
Use Date.Now instead of DateTime.Now