This question already has an answer here:
How can I calculate how many nights are there in a date range?
(1 answer)
Closed 7 years ago.
I have a start DateTime and an end DateTime and need to calculate the number of nights (not days) between the two with a default/minimum value being 1.
I've got
int NumberOfDays = Convert.ToInt32((EndDateTime - StartDateTime).Days)
Which returns the number of days so is always over by 1. I'm not sure that subtracting 1 from the result is an appropriate solution.
I have also tried
int NumberOfDays = Convert.ToInt32((EndDateTime - StartDateTime).ToDays)
Which also returns the same result.
Is there a smarter solution other than subtracting 1 every time and making sure it never returns a 0?
You can use extension method to make it simply reuse everywhere.
public static class DateTimeExtensions
{
public static int NumberOfNights(this DateTime date1, DateTime date2)
{
//feel free to make here better
var frm = date1 < date2 ? date1 : date2;
var to = date1 < date2 ? date2 : date1;
var totalDays = (int)(to-frm).TotalDays;
return totalDays > 1 ? totalDays : 1;
}
}
And use it like
var to = DateTime.Now.AddDays(3);
var frm = DateTime.Now;
frm.NumberOfNights(to)
Related
This question already has answers here:
Date Difference in ASP.Net
(6 answers)
Closed 3 years ago.
I organized a program which started on 31st December 2018 at 10:00pm hence its been four months ago, i want a way to find this duration by code.
for example , how youtube is able to tell when a comment was written(eg,4years ago,5 months ago).
You can simply substract a DateTime object from another, which results in a TimeSpan representing the difference:
DateTime x = DateTime.Now;
DateTime y = DateTime.Today;
TimeSpan difference = x - y;
var programStartDateTime = new DateTime(2018, 12, 31);
var timeSpan = DateTime.Now - programStartDateTime;
Console.WriteLine($"The difference is: {timeSpan.ToString()}");
I think below sample code may help you
DateTime date1 = DateTime.Now;
DateTime date2 = DateTime.Now.AddDays(-1);
TimeSpan time = date1 - date2;
WriteLine($"TimeSpan : {time}" );
I want to find the service period of the employee ,i already get the employee join date from database its like that
ex - join Date: 2007/03/24
Now I need to find the difference between system date and join date if any one can have idea about that please help me thanks.
sample code which i wrote to get answer ,but it not work correctly
public TimeSpan periodOfService
{
get
{
//DateOfJoin-->which i get from my database
DateTime JoinDate = Convert.ToDateTime(DateOfJoin);
DateTime TodayData = DateTime.Now;
TimeSpan servicePeriod = JoinDate - TodayData;
return servicePeriod;
}
}
out put format - >2 years, 3 months
How can I do this in Asp.net MVC 4?
First of all, swap the dates around.
You want to subtract JoinDate from TodayData (also revise spellings and naming conventions):
public TimeSpan periodOfService
{
get
{
//DateOfJoin-->which i get from my database
DateTime JoinDate = Convert.ToDateTime(DateOfJoin);
DateTime TodayData = DateTime.Now;
TimeSpan servicePeriod = TodayData - JoinDate;
return servicePeriod;
}
}
Unfortunately, OP, outputting this TimeSpan value in the format you'd like is a lot trickier than you'd initially think, see the following article for how to achieve that:
http://joelfillmore.com/years-and-months-between-dates/
I'd recommend you read up on the solution it suggests and then look into using the method:
public DateSpan(DateTime startDate, DateTime endDate)
Normally you will use a TimeSpan to represent the difference between to dates but your requirement to display the difference as years and months makes TimeSpan unsuitable. Instead you can create a class to represent the difference:
class DateDifference {
public DateDifference(Int32 years, Int32 months) {
Years = years;
Months = months;
}
public Int32 Years { get; private set; }
public Int32 Months { get; private set; }
}
You can the calculate the difference between two dates using simple arithmetic:
DateDifference GetDateDifference(DateTime first, DateTime second) {
if (second < first)
throw new ArgumentOutOfRangeException("second", "The second date cannot occur before the first.");
var years = second.Year - first.Year;
var months = second.Month - first.Month;
if (second.Month < first.Month) {
years -= 1;
months += 12;
}
return new DateDifference(years, months);
}
You can then use the function in your code:
var dateDifference = GetDateDifference(JoinDate, TodayDate);
This will get you the difference between the two dates, regardless of if it's in the future or in the past.
If it's an invalid date, a zero span is returned
public TimeSpan periodOfService
{
get
{
DateTime JoinDate;
if (DateTime.TryParse(DateOfJoin, out JoinDate))
{
return DateTime.Now > JoinDate ? DateTime.Now - JoinDate : JoinDate - DateTime.Now;
}
return TimeSpan.Zero;
}
}
You Can Get Total Day Diff And Convert it To Month And Year
a Simple Sample is here
TimeSpan servicePeriod = TodayData - JoinDate;
string result = string.Format("{0} Years, {1} Months, {2} Days", servicePeriod.TotalDays / 365, servicePeriod.TotalDays / 30, servicePeriod.TotalDays);
you Can Return a string not a timespan
I'm using the following to get the current week number:
var weekNo = CultureInfo.CurrentCulture.Calendar.GetWeekOfYear(DateTime.UtcNow,
CalendarWeekRule.FirstFullWeek,
DayOfWeek.Sunday);
And I want to return the DateTime representing the first day of the nth week after today.
e.g. when n = 2, I would want the DateTime representing the Sunday after next.
Is there a way I can do this in C#?
You could use:
DateTime sundayInFuture = DateTime.Today.AddDays((n - 1) * 7 + (7 - (int)DateTime.Today.DayOfWeek));
That should work (though I've not got access to anything to test it!).
Edit: Thanks to the comments.
This should work:
int n = 2;
DateTime today = DateTime.Today;
int daysToNextSunday = (7 - today.DayOfWeek - DayOfWeek.Sunday) ;
DateTime nthSunday = today.AddDays((n - 1) * 7 + daysToNextSunday);
Could you add the number of days from now until Sunday, and then add (n-1)*7 more days?
Please note, that Calendar.GetWeekOfYear is not ISO 8601 conform.
Here a sample Using the Week class of the Time Period Library for .NET:
// ----------------------------------------------------------------------
public DateTime GetStartOfWeek( DateTime moment, int offset )
{
return new Week( new Week( moment ).WeekOfYear + Math.Abs( offset ) ).FirstDayOfWeek;
} // GetStartOfWeek
This question already has answers here:
Calculate difference between two dates (number of days)?
(17 answers)
Closed 9 years ago.
We want to find the number of days between two dates. This is simple when the dates are in the same year.
Is there a built-in way to do this if the dates are in different years, or do we just have to loop through each year?
Subtracting a date from another yields a TimeSpan. You can use this to determine the number of whole days using the Days property, or whole and fractional days using the TotalDays property.
DateTime start = ...;
DateTime end = ...;
int wholeDays = (end - start).Days;
or
double totalAndPartialDays = (end - start).TotalDays;
you can probably do something like:
TimeSpan ts = endDate - startDate;
ts.Days
What are you missing?
DateTime - DateTime => Timespan
and Timespan has Days and TotalDays properties.
DateTime date1 = DateTime.Now;
DateTime date2 = new DateTime(date1.Year - 2, date1.Month, date1.Day);
Int32 difference = date1.Subtract(date2).Days;
This question already has answers here:
How can I get the DateTime for the start of the week?
(34 answers)
Closed 8 years ago.
I was wondering if you guys know how to get the date of currents week's monday based on todays date?
i.e 2009-11-03 passed in and 2009-11-02 gets returned back
/M
This is what i use (probably not internationalised):
DateTime input = //...
int delta = DayOfWeek.Monday - input.DayOfWeek;
DateTime monday = input.AddDays(delta);
The Pondium answer can search Forward in some case. If you want only Backward search I think it should be:
DateTime input = //...
int delta = DayOfWeek.Monday - input.DayOfWeek;
if(delta > 0)
delta -= 7;
DateTime monday = input.AddDays(delta);
Something like this would work
DateTime dt = DateTime.Now;
while(dt.DayOfWeek != DayOfWeek.Monday) dt = dt.AddDays(-1);
I'm sure there is a nicer way tho :)
public static class DateTimeExtension
{
public static DateTime GetFirstDayOfWeek(this DateTime date)
{
var firstDayOfWeek = CultureInfo.CurrentCulture.DateTimeFormat.FirstDayOfWeek;
while (date.DayOfWeek != firstDayOfWeek)
{
date = date.AddDays(-1);
}
return date;
}
}
International here. I think as extension it can be more useful.
What about:
CultureInfo.CurrentCulture.DateTimeFormat.FirstDayOfWeek
Why don't use native solution?
var now = System.DateTime.Now;
var result = now.AddDays(-((now.DayOfWeek - System.Threading.Thread.CurrentThread.CurrentCulture.DateTimeFormat.FirstDayOfWeek + 7) % 7)).Date;
Probably will return you with Monday. Unless you are using a culture where Monday is not the first day of the week.
Try this:
public DateTime FirstDayOfWeek(DateTime date)
{
var candidateDate=date;
while(candidateDate.DayOfWeek!=DayOfWeek.Monday) {
candidateDate=candidateDate.AddDays(-1);
}
return candidateDate;
}
EDIT for completeness: overload for today's date:
public DateTime FirstDayOfCurrentWeek()
{
return FirstDayOfWeek(DateTime.Today);
}