Calculating Date Difference With Timespan And Future Dates?

Nov 12, 2010

I am trying to flag rows in a grid in the following order based on a date column

When 2 or more days old from today
then RED
When 1 day old then YELLOW
When 0 days old then GREEN
When the date is in the future then

I have the following which is working fine except for the future dates which are GREEN instead of BLUE.

Dim myDate As DateTime = CType(grdSummaryView.GetRowCellValue(e.RowHandle, "myDate"), DateTime)
Select Case Now.Subtract(myDate).Days
'2 or more days old then RED FLAG
Case Is >= 2



Calculating Past And Future Dates From A Static Date?

Aug 10, 2010

I am teaching myself VB while creating a basic application I can use at work. Is there something in VB that will calculate a past and future date from a specific date. For instance, an Election Date falls on November 2, 2011. Once this election date is entered I want the program to calculate the reporting dates. The first report due is due exactly 32 days prior to the election. The 30 day post is due 30 days after the election.

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Mar 14, 2011

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Jul 29, 2011

I have a form where a user can choose an election date. One of the most frequent errors users make is entering the incorrect due dates of reports. Therefore, I am attempting to generate the report due dates in the application using the report guidelines. For instance, reports are due 32 and 15 days prior to the election and 30 and 60 days after an election.

I know the following won't work but you get the jest of what I am attempting to do. I am assuming I will need to break down the month, day and year somehow before I subtract or add the days to the date to get the actual report date.


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Oct 12, 2009

In VB2005 I am trying to calculate the number of business days between two dates. I must also account for U.S. holidays (New Year's Day, Martin Luther King Day, Memorial Day, Independence Day, Labor Day, Veterans Day, Thanksgiving Day/Friday after, Christmas Day). If a holiday falls on a Saturday, then the prior day (Friday) is assumed to be a holiday. Likewise, if the holiday falls on a Sunday then the following day (Monday) is assumed to be a holiday.

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Jan 12, 2011

Say the user specifies these two dates....

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End Date: 2011-01-15

If I select December 2010 I should get the folllowing

startdate = 2010-12-05
enddate = 2010-12-31
Select January 2011 then
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enddate = 2011-01-15

Should I subtract dates? How can I get the start and enddate for the current month/year based on the overall start and end date.I'm coding in

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Mar 14, 2011

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Jul 14, 2010

I have the following VB.NET Code:

Dim Date1 As New DateTime(2010,5,6)
Dim Date2 As New DateTime(2009,10,12)
Dim NumOfMonths = 0 ' This is where I am stumped

What I am trying to do is find out how many months are between the 2 dates.

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Aug 31, 2009

I want to validate textbox so that it will accept only future date. Can I have regular expression for the same.

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Dec 28, 2011

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Oct 5, 2011

I'm using the ASP.Net Membership system but I'm having an issue with the LastActivityDate for the users in the database. For some users, their last activity date is in the future...

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Feb 23, 2012

I need to have the Calendar Control start 36 hours after the current date. How would I do that?

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check values and keep the form from processing:

Protected Sub calPickupDate_SelectionChanged(sender As Object, e As System.EventArgs) Handles calPickupDate.SelectionChanged
If calPickupDate.SelectedDate < Today.AddHours(36) Then


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Nov 24, 2009

I made a programme through which I get a feed back clicking a button for a future warning date. I am giving the code below so that you can givthe problem is, I have to take 12 DateTimePicker to do that job in a single form which is creating a saving problem means when I click save button it takes long time to save. Now, I thought If I can do it by using TextBoxn a date format would easeup my save problem. Or it can be MaskedTextBox as well. Below is my code if any one can give me the solution.

Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If DateTime.Now > DateTimePicker1.Value.AddYears(1).AddDays(1) Then


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Oct 19, 2011

I am trying to calculate the difference between 2 times.

So far I have 4 labels.

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Label2 = Contains the exact time that the application was last closed.
Label3 = Contains the exact time that the application was opened.

Label4 = I want this label to say how much time in seconds had elapsed between the application last being closed and the application being opened again, in other words the difference in seconds between label 2 and label 3.

Below is what I have done so far, but despite repeated efforts I can't seem to find a way of getting the time difference to show in label 4?


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May 1, 2010

I have a text box on a form. It is a masked text box that shows in the format XX/XX.It is used for the expiry date of a credit card.What I need to do is how to take a value like 08/11 which means August, 2011 and check that it is in the future.For example something like 08/09 would be last year and hence would be invalid.Is there any way to take this string and check?

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Jquery Or Code For Checking Future Date Entered In Textbox

Aug 31, 2009

I have below code in


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Sep 23, 2009

Let just say I have an Integer like 10,000 (that's the VALUE in want to reach). So, I have another integer like 2500 (that's my current VALUE). Third I have another Integer about 350 PER HOUR. To reach 10,000 I need 7,500 (well I already have 2,500). How long must I wait to reach the 10,000 when the increase is about 350 a Hour. Okay, that's easy: 7,500 / 350 = 21,428571 Hours. BUT how can I convert this double to a timespan? Or how is it possible to add this double value to the current Date to get the Date + Time when I reach the Value?

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Feb 28, 2012

I am trying to find the difference between two dates. The first of the two dates can be changed and when it is changed, the difference between the original dates has to be retained. This means that I have to automatically change the second date to have the same difference in days as it did before, but with a new first date. [code]I have the value of the old date1(currDate) and the new date1 value(newDate). I need to get the difference between these, and then add or minus these days from the endDate.

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Jul 20, 2011

I have a sqlce database table that I am entering data every day.

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12-05-2010 2 3423 4567 0987


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Feb 10, 2010

I need to take 6 user entered dates and compare them to a date pulled from a database & stored in a variable. If greater than 6 weeks, then some action needs to take place.When writing the code, I get the following message (before compilation). Value of type 'Date' cannot be converted to 'System.TimeSpan'. [code] Within my code the 'dt' in the line above is underlined with the error message appearing on mouseover. I have tried using CType, as in dt = CType(Session("dt_occurence"), DateTime) in the hopes that might work, but it doesn't do it.

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Feb 24, 2010

I've been trying many ways to calculate the round number of days between two dates, I mean, counting the whole days. An example of what I need:


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Jan 9, 2011

How to calculate the difference in months between two dates in C#? Is there is equivalent of VB's DateDiff() method in C#. I need to find difference in months between two dates that are years apart. The documentation says that I can use TimeSpan like:


but this gives me data in Days. I don't want to divide this number by 30 because not every month is 30 days and since the two operand values are quite apart from each other, I am afraid dividing by 30 might give me a wrong value.

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Dec 18, 2010

i have this function and i want it 2 calculate the difference between two dates and it is suposed to return the difference in days but it it just not working


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Feb 7, 2011

I am changing the row color of my gridview based on how many days the task is from today. But it is not working date1 is todays date and date2 is the due date of the task.also when i sort i click on the column headers to sort, the rows change colors..[code]

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Mar 12, 2012

I need a program which shows day and time difference between 2 dates.For example: The user chooses 2011/12/11 10:20:05 and 2010/12/11/ 10:40:35.Then the program shows the difference between them in days ,hours ,minutes and seconds.

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Jan 11, 2010

I try use datediff function to get month interval between 2 hijri dates but the function deals with the dates as Gregorian Dates so the result is not correct.

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Jun 19, 2009

I have two tables: a schedule table that contains information about how an employee is scheduled and a numbers table in which each number corresponds to a date.


I can do this on the SQL side or the code side. I have Linq at my disposal if I need it. The table doesn't need to be compiled by SQL. This will happen dynamically on a website and should be as efficient as possible.I don't want to have to iterate through each and look for breaks in contiguous days if I don't have to.

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Jan 13, 2010

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May 1, 2009

I need to calculate the difference between two days excluding weekends.

this code counts the difference between two days.


Public Class Form1
Dim date1 As Date
Dim date2 As Date


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Mar 6, 2009

I'm trying to make this program which compares the difference between any date in the past and the system date, showing how many days have elapsed since that date. This is the layout I've created so far, the two date boxes currently show the system date so even if I change the system date, both those boxes will adjust to show it as well. I want to try and make the system date a box without a drop down arrow and so you cannot edit the box at all. The box below is fine how it is as the user can enter any date they desire. And the text box at the bottom needs to show the difference between the system date and the inputted date.

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Nov 29, 2011

How to get difference between two dates in Year/Month/Week/Day?

I have a problem with the difference between two dates. I need the out put in 0 YEAR, 0 MONTHS, 0 DAYS LEFTm e.g.:


With dateDiff function or using anything else it is not pos

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Jul 19, 2009

I'm using datediff to establish difference between two dates using datetimepicker.i.m nnot getting the right results. a one day difference returns a 0, a two day difference returns a 1 etc. the code I am using is posted below.

days = DateDiff(DateInterval.Day, dtpStart.Value(), dtpEnd.Value())

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Dec 1, 2011

I am trying to get a list of dates from a provided StartDate and EndDate in my database, and use these dates to link to dates in a database (to display another variable on the y-axis of the chart) and to populate the x-axis of a chart (with the list of dates). Is it possible to get a list of dates in VB and pass them into a chart this way?

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Nov 20, 2011

How do I calculate the difference between two dates to display as a number in days?I have 2 text boxes (txtHStart_Date & txtHEnd_Date) I have used an Ajax Calendar Extender to enter the dates in each of these text boxes.I would like to get the difference between these two dates to show in a seperate text box (txtNoOfDays)

I've seen the timespan function but can seem to get this to work. I'm not to sure how to declare the text boxes as the dates I would the calculation to be made from


Dim D1 As Date
Dim D2 As Date
Dim ts As New TimeSpan
D1 = txtHStart_Date.Text
D2 = txtHEnd_Date.Text
ts = D2 - D1

But I know this isn't right. I also don't know how to get it to display in the 3rd TextBox.

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Dec 9, 2009

These two TimeSpan are stored in the Database with 24hr format. No date, only TimeSpan.

Dim r As TimeSpan
Dim tsStart As TimeSpan
Dim tsEnd As TimeSpan


Is there any TimeSpan method to get this right?

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Mar 6, 2009

I'm trying to write a program which compares the difference between any date in the past and the system date, showing how many days have elapsed since that date.This is what I've got so far:

Public Class Form1
Private Sub TextBox2_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)
End Sub


That's what it looks like so far. I was wondering how you can automate the top label so it automatically comes up with the date when the program is run.Plus, I need to know how to display the dates difference (how many days have elapsed between the system date and the user's chosen date) in the bottom label.

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Jul 10, 2011

How to get difference between two dates in Year/Month/Week/Day?

How do i calculate exact difference between to date including years, days, moths, weeks. Just like windows calculator does. ?

And represent like this 1 years, 1 months, 1 week, 1 day

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Jun 22, 2012

I need to calculate the end date given the number of business days (excluding weekend and holidays). All the examples I've seen so far return the number of business days between a start date and an end date.

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Dec 4, 2010

I am writing an application for my class, wherein I have a mortgage that will give the customer a discount of 1% on their interest if they pay early in the month, or penalize them by 1% if they are after the due date. Right now, I have it working with a checkbox that the user selects. However, I would like to have VB see the current date on the calendar I placed in the application already, and calculate the appropriate amount of interest based on that information. I am using Microsoft 2008 Visual Basic Express Edition on a PC.

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Jan 21, 2010

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Oct 6, 2009

I know about DateDiff and TimeSpan. I am doing a project. I save a date in the registry. Now, I have to test this date against today's date and calculate the differences in minutes, hours, days, months, weeks and years.

I save the date in the registry like this:
Application.UserAppDataRegistry.SetValue("Date", [Date])

I then made a sub to calculate the differences:
Private Sub Calculate()
Dim DateGen As Date
DateGen = CType([Date], Date)
Select Case TimePeriod
[Code] .....

As you can see, based on the difference between these dates ( today's date and the registry date ), a sub gets called and the program continues. Unfortunately, the minutes and hours never calls the RandomAlpha sub. How can I calculate the difference in minutes, hours etc.????

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Apr 16, 2009

I need to get all dates between a start and end date and then add them to a list or collection.

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Apr 26, 2010

I have a requirement that regardless of the start and dates that I need to loop through that timespan and calculate figures at the month level. I cannot seem to figure it out, and maybe it is not possible, but I would like to do something like:

FOREACH Month As TimeSpan in ContractRange.Months
Do Calculations (Month.Start, Month.End)

Is this possible or do I need to calculate the number of months, and just iterate through the amount of months and calculate the start/end of that month based on my index?

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Jul 16, 2010

Thought I'd see if Stack overflow is quicker than me testing something while I get a thousand interruptions from other work :)

I'm updating an old VB net application and trying to refactor some of the logic as I go. The app looks for data from a single date across a few tables and writes that view to a file.

Writing the query in SQL I'd get the equivalent of

WHERE CAST(FLOOR(CAST( AS float))AS datetime) = '15-Jul-2010'

Ideally I'd use

SELECT * FROM table WHERE date=@input

and add a date object as a parameter to a System.Data.SqlClient.SqlCommand instance

Are those two comparable? Will I get the results I expect?

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Oct 13, 2010

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