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How to calculate actual working days of my when user checkin in hotel? I want to count working days only except Saturday and Sunday. Please check below function its count working days but in parameter I entered startdate and enddate.
I want send only startdate its automatically count 15 working days and return me enddate.
//Days count
public static double GetBusinessDays(DateTime startD, DateTime endD)
{
double calcBusinessDays =
1 + ((endD - startD).TotalDays * 5 -
(startD.DayOfWeek - endD.DayOfWeek) * 2) / 7;
if (endD.DayOfWeek == DayOfWeek.Saturday) calcBusinessDays--;
if (startD.DayOfWeek == DayOfWeek.Sunday) calcBusinessDays--;
return calcBusinessDays;
}
I want like this:
public static Datetime GetBusinessDays(DateTime startDate)
{
Datetime After15WorkingDaysDate;
return After15WorkingDaysDate;
}
Here are two methods.
The idea is to generate each date in the range, decide whether it is a Business Day, and only then add it to the result list.
GetBusinessDaysInRange returns a list of the dates of the Business Days between the given start and end date. End date is exclusive, i.e. if the end date is a Business Day, it will not be part of the result.
// Returns a list of the dates of the Business Days between the given start and end date
public static IEnumerable<DateTime> GetBusinessDaysInRange(DateTime startDate, DateTime endDate, DayOfWeek[] closedOn) {
if (endDate < startDate) {
throw new ArgumentException("endDate must be before startDate");
}
var businessDays = new List<DateTime>();
var date = startDate;
while (date < endDate) {
if (!closedOn.Contains(date.DayOfWeek)) {
businessDays.Add(date);
}
date = date.AddDays(1);
}
return businessDays;
}
GetFixedNumberOfBusinessDays returns a list of the dates of the Business Days from the given start with the given number of days (the method you asked for).
// Returns a list of the dates of the Business Days from the given start with the given number of days
public static IEnumerable<DateTime> GetFixedNumberOfBusinessDays(DateTime startDate, int numberOfBusinessDays, DayOfWeek[] closedOn) {
if (numberOfBusinessDays < 0) {
throw new ArgumentException("numberOfBusinessDays must be zero or positive.");
}
var businessDays = new List<DateTime>();
var date = startDate;
while (businessDays.Count() < numberOfBusinessDays) {
if (!closedOn.Contains(date.DayOfWeek)) {
businessDays.Add(date);
}
date = date.AddDays(1);
}
return businessDays;
}
The parameter DayOfWeek[] closedOn was introduced because you do not want to hardcode the days of the week that are not Business Days.
The return type was changed to IEnumerable<DateTime> so this method is more universal. If you only want the number of days and are not interested in the actual dates, just run a .Count() on the result. If you want the end date, call .Last().
.Net Fiddle with usage examples:
var closedOn = new DayOfWeek[] { DayOfWeek.Saturday, DayOfWeek.Sunday };
var start = new DateTime(2018, 07, 23);
var numberOfDays = 10;
var businessDays = GetFixedNumberOfBusinessDays(end, numberOfDays, closedOn);
int actualNumberOfBusinessDays = businessDays.Count(); // 10
DateTime endDate = businessDays.Last(); // Friday, August 3, 2018
It should be generic method. You can add different work day in another place.
public static DateTime AddWorkdays(this DateTime originalDate, int workDays)
{
DateTime tmpDate = originalDate;
while (workDays > 0)
{
tmpDate = tmpDate.AddDays(1);
if (tmpDate.DayOfWeek == DayOfWeek.Saturday ||
tmpDate.DayOfWeek == DayOfWeek.Sunday )
workDays--;
}
return tmpDate;
}
DateTime endDate = startDate.AddWorkdays(15);
i want c# code for getting Last Date of week for given month and year.
suppose given month is 1 and year is 2016 then method should return me
--01/02/2016
--01/09/2016
--01/16/2016
--01/23/2016
--01/30/2016
--02/06/2016
So you want a method which takes a year and a month as parameter and returns dates. Those dates should be the last dates of all weeks in that month, optionally also of following months.
This should work then:
public static IEnumerable<DateTime> GetLastWeekDatesOfMonth(int year, int month, DayOfWeek firstDayOfWeek = DayOfWeek.Monday, bool includeLaterMonths = false)
{
DateTime first = new DateTime(year, month, 1);
int daysOffset = (int)firstDayOfWeek - (int)first.DayOfWeek;
if (daysOffset < 0)
daysOffset = 7 - Math.Abs(daysOffset);
DateTime firstWeekDay = first.AddDays(daysOffset);
DateTime current = firstWeekDay.AddDays(-1); // last before week start
if (current.Month != month)
current = current.AddDays(7);
yield return current;
if (includeLaterMonths)
{
while (true)
{
current = current.AddDays(7);
yield return current;
}
}
else
{
while((current = current.AddDays(7)).Month == month)
yield return current;
}
}
Your sample:
var lastDates = GetLastWeekDatesOfMonth(2016, 1, DayOfWeek.Sunday, true);
foreach (DateTime dt in lastDates.Take(6))
Console.WriteLine(dt.ToShortDateString());
public static DateTime GetLastDateofWeek(int yr, int mnth, int week)
{
DateTime dt = new DateTime(yr, mnth, 1);
DateTime newdate = new DateTime();
if (dt.DayOfWeek == DayOfWeek.Monday)
{
newdate = dt.AddDays(((week - 1) * 7) + 5);
}
else
{
newdate = dt.AddDays((8 - (int)dt.DayOfWeek) % 7 + ((week - 2) * 7) + 5);
}
return newdate;
}
First get month and year, example:
int year = 2016;
int month = 1;
And then create a new instance of the DateTime class that represents the first saturday.
DateTime firstsaturday = new DateTime(year,month,1);
while(firstsaturday.DayOfWeek != DayOfWeek.Saturday)
{
firstsaturday = firstsaturday.AddDays(1);
]
Then create a List of DateTime values.
List<DateTime> saturdays = new List<DateTime>();
saturdays.Add(firstsaturday);
And then cycle through all saturdays using a loop.
DateTime CurrentSaturday = firstsaturday;
while(CurrentSaturday.AddDays(7).Month == month)
{
CurrentSaturday = CurrentSaturday.AddDays(7);
Saturdays.Add(CurrentSaturday);
}
You may try this code.
using System;
public class Program
{
public static void Main()
{
DateTime thisMonthInLastYear = DateTime.Now.AddYears(-1);
DateTime endOfMonth = new DateTime(thisMonthInLastYear.Year,
thisMonthInLastYear.Month,
DateTime.DaysInMonth(thisMonthInLastYear.Year,
thisMonthInLastYear.Month));
Console.WriteLine("Today : "+DateTime.Now.ToString("dd-MM-yyyy"));
Console.WriteLine("This Month in last years : "+endOfMonth.ToString("dd-MM-yyyy"));
Console.WriteLine("Next month in last years : "+endOfMonth.AddMonths(1).ToString("dd-MM-yyyy"));
}
}
I have a function that returns me only the fridays from a range of dates
public static List<DateTime> GetDates(DateTime startDate, int weeks)
{
int days = weeks * 7;
//Get the whole date range
List<DateTime> dtFulldateRange = Enumerable.Range(-days, days).Select(i => startDate.AddDays(i)).ToList();
//Get only the fridays from the date range
List<DateTime> dtOnlyFridays = (from dtFridays in dtFulldateRange
where dtFridays.DayOfWeek == DayOfWeek.Friday
select dtFridays).ToList();
return dtOnlyFridays;
}
Purpose of the function: "List of dates from the Week number specified till the StartDate i.e. If startdate is 23rd April, 2010 and the week number is 1,then the program should return the dates from 16th April, 2010 till the startddate".
I am calling the function as:
DateTime StartDate1 = DateTime.ParseExact("20100430", "yyyyMMdd", System.Globalization.CultureInfo.InvariantCulture);
List<DateTime> dtList = Utility.GetDates(StartDate1, 4).ToList();
Now the requirement has changed a bit. I need to find out only the last Fridays of every month.
The input to the function will remain same.
You already have the list of Fridays in the given range. Now just query this again like this:
List<DateTime> lastFridays = (from day in fridays
where day.AddDays(7).Month != day.Month
select day).ToList<DateTime>();
Hope this helps.
Just a small improvement on Sarath's answer, for those (like me) who step into this question
private DateTime GetLastFridayOfTheMonth(DateTime date)
{
var lastDayOfMonth = new DateTime(date.Year, date.Month, DateTime.DaysInMonth(date.Year, date.Month));
while (lastDayOfMonth.DayOfWeek != DayOfWeek.Friday)
lastDayOfMonth = lastDayOfMonth.AddDays(-1);
return lastDayOfMonth;
}
Here's an extension method we are using.
public static class DateTimeExtensions
{
public static DateTime GetLastFridayInMonth(this DateTime date)
{
var firstDayOfNextMonth = new DateTime(date.Year, date.Month, 1).AddMonths(1);
int vector = (((int)firstDayOfNextMonth.DayOfWeek + 1) % 7) + 1;
return firstDayOfNextMonth.AddDays(-vector);
}
}
Below is the MbUnit test case
[TestFixture]
public class DateTimeExtensionTests
{
[Test]
[Row(1, 2011, "2011-01-28")]
[Row(2, 2011, "2011-02-25")]
...
[Row(11, 2011, "2011-11-25")]
[Row(12, 2011, "2011-12-30")]
[Row(1, 2012, "2012-01-27")]
[Row(2, 2012, "2012-02-24")]
...
[Row(11, 2012, "2012-11-30")]
[Row(12, 2012, "2012-12-28")]
public void Test_GetLastFridayInMonth(int month, int year, string expectedDate)
{
var date = new DateTime(year, month, 1);
var expectedValue = DateTime.Parse(expectedDate);
while (date.Month == month)
{
var result = date.GetLastFridayInMonth();
Assert.AreEqual(expectedValue, result);
date = date.AddDays(1);
}
}
}
Check what day of the week the first day of the next month is on, then subtract enough days to get a Friday.
Or, if you already have a list of Fridays, return only those for which adding 7 days gives a date in the next month.
Based on DeBorges answer, here is an extension to get any specific Day
public static DateTime GetLastSpecificDayOfTheMonth(this DateTime date, DayOfWeek dayofweek)
{
var lastDayOfMonth = new DateTime(date.Year, date.Month, DateTime.DaysInMonth(date.Year, date.Month));
while (lastDayOfMonth.DayOfWeek != dayofweek)
lastDayOfMonth = lastDayOfMonth.AddDays(-1);
return lastDayOfMonth;
}
Call the below function by sending the date as parameter, in which it extracts the month and year from the date parameter and returns the last Friday of that month
public DateTime GetLastFridayOfMonth(DateTime dt)
{
DateTime dtMaxValue = DateTime.MaxValue;
DateTime dtLastDayOfMonth = new DateTime(dt.Year, dt.Month, DateTime.DaysInMonth(dt.Year, dt.Month));
while (dtMaxValue == DateTime.MaxValue)
{
// Returns if the decremented day is the fisrt Friday from last(ie our last Friday)
if (dtMaxValue == DateTime.MaxValue && dtLastDayOfMonth.DayOfWeek == DayOfWeek.Friday)
return dtLastDayOfMonth;
// Decrements last day by one
else
dtLastDayOfMonth = dtLastDayOfMonth.AddDays(-1.0);
}
return dtLastDayOfMonth;
}
I'm sure I'm not the first person to need to do this, so I'm looking for the best way.
I've got a set of radio buttons with choices such as
This Year
Last Year
This Month
Last Month
This Week
Last Week
and I need to produce the proper relative date range from the current date (DateTime.Now).
For example if Last Year was selected and the current date was 4/2/09 14:45:32 I would need to return a start date of 1/1/08 00:00:00 and end date of 12/31/08 23:59:59.
Any thoughts?
All of these have been tested using DateTime.Today, and work just like you asked for:
public struct DateRange
{
public DateTime Start { get; set; }
public DateTime End { get; set; }
}
public static DateRange ThisYear(DateTime date)
{
DateRange range = new DateRange();
range.Start = new DateTime(date.Year, 1, 1);
range.End = range.Start.AddYears(1).AddSeconds(-1);
return range;
}
public static DateRange LastYear(DateTime date)
{
DateRange range = new DateRange();
range.Start = new DateTime(date.Year - 1, 1, 1);
range.End = range.Start.AddYears(1).AddSeconds(-1);
return range;
}
public static DateRange ThisMonth(DateTime date)
{
DateRange range = new DateRange();
range.Start = new DateTime(date.Year, date.Month, 1);
range.End = range.Start.AddMonths(1).AddSeconds(-1);
return range;
}
public static DateRange LastMonth(DateTime date)
{
DateRange range = new DateRange();
range.Start = (new DateTime(date.Year, date.Month, 1)).AddMonths(-1);
range.End = range.Start.AddMonths(1).AddSeconds(-1);
return range;
}
public static DateRange ThisWeek(DateTime date)
{
DateRange range = new DateRange();
range.Start = date.Date.AddDays(-(int)date.DayOfWeek);
range.End = range.Start.AddDays(7).AddSeconds(-1);
return range;
}
public static DateRange LastWeek(DateTime date)
{
DateRange range = ThisWeek(date);
range.Start = range.Start.AddDays(-7);
range.End = range.End.AddDays(-7);
return range;
}
This year:
DateTime Today = DateTime.Today;
DateTime StartDate = new DateTime(Today.Year,1,1);
DateTime EndDate = StartDate.AddYears(1).AddSeconds(-1);
This month:
DateTime Today = DateTime.Today;
DateTime StartDate = new DateTime(Today.Year,Today.Month,1);
DateTime EndDate = StartDate.AddMonths(1).AddSeconds(-1);
This week:
DateTime Today = DateTime.Today;
DateTime StartDate = Today.AddDays(-((int) Today.DayOfWeek));
DateTime EndDate = StartDate.AddDays(7).AddSeconds(-1);
Last year / month / week are simple variations on above. Edit: This week assumes the week starts on Sunday. You would have to modify the code slightly if your weeks start on Monday.
I would create a factory method which will return an interface (or a delegate which you can execute) which would be passed the current date and return the date range for you based on the implementation.
Of course, which implementation you return from the factory method would be determined by the value of an enumeration you pass to it which corresponds to "this year", "last year", etc, etc.
I would use the DateTime built-in methods for Adding and returning specific portions of the date to write a function that would return the interval.
I need to get a list of weeks for a given month, with Monday as the start day.
So for example, for the month of February 2009, this method would return:
2/2/2009
2/9/2009
2/16/2009
2/23/2009
// Get the weeks in a month
DateTime date = DateTime.Today;
// first generate all dates in the month of 'date'
var dates = Enumerable.Range(1, DateTime.DaysInMonth(date.Year, date.Month)).Select(n => new DateTime(date.Year, date.Month, n));
// then filter the only the start of weeks
var weekends = from d in dates
where d.DayOfWeek == DayOfWeek.Monday
select d;
public static List<DateTime> GetWeeks(
this DateTime month, DayOfWeek startOfWeek)
{
var firstOfMonth = new DateTime(month.Year, month.Month, 1);
var daysToAdd = ((Int32)startOfWeek - (Int32)month.DayOfWeek) % 7;
var firstStartOfWeek = firstOfMonth.AddDays(daysToAdd);
var current = firstStartOfWeek;
var weeks = new List<DateTime>();
while (current.Month == month.Month)
{
weeks.Add(current);
current = current.AddDays(7);
}
return weeks;
}
Here's a solution (effectively one line) using C# 3.0/LINQ, in case you're interested:
var month = new DateTime(2009, 2, 1);
var weeks = Enumerable.Range(0, 4).Select(n => month.AddDays(n * 7 - (int)month.DayOfWeek + 1)).TakeWhile(monday => monday.Month == month.Month);
int year = 2009;
int month = 2;
DateTime startDate = new DateTime(year, month, 1);
DateTime endDate = startDate.AddMonths(1);
while (startDate.DayOfWeek != DayOfWeek.Monday)
startDate = startDate.AddDays(1);
for (DateTime result = startDate; result < endDate; result = result.AddDays(7))
DoWhatYouWant(result);
How about this?
public IEnumerable<DateTime> GetWeeks(DateTime date, DayOfWeek startDay)
{
var list = new List<DateTime>();
DateTime first = new DateTime(date.Year, date.Month, 1);
for (var i = first; i < first.AddMonths(1); i = i.AddDays(1))
{
if (i.DayOfWeek == startDay)
list.Add(i);
}
return list;
}
Something like the following pseudo-code should work:
Determine the start date of the month (use month and year from a date and set the day to 1
Determine the end date of the month (start date + 1 month)
Determine the first date that is a monday (this is your first item in the list)
Add 7 days to find the next date and repeat until you read or pass the month end
Just change the response line to what ever you need to do with it
protected void PrintDay(int year, int month, DayOfWeek dayName)
{
CultureInfo ci = new CultureInfo("en-US");
for (int i = 1 ; i <= ci.Calendar.GetDaysInMonth (year, month); i++)
{
if (new DateTime (year, month, i).DayOfWeek == dayName)
Response.Write (i.ToString() + "<br/>");
}
}
Quick solution: i don't think there is a built in function for it....
I see you got your answer, but I wanted to share with you a helper class I created for one of my projects. It's far to be a comprehansive class, but might help...
public static class WeekHelper {
#region Public Methods
public static DateTime GetWeekStart(DateTime date) {
DateTime weekStart;
int monday = 1;
int crtDay = (int)date.DayOfWeek;
if (date.DayOfWeek == DayOfWeek.Sunday)
crtDay = 7;
int difference = crtDay - monday;
weekStart = date.AddDays(-difference);
return weekStart;
}
public static DateTime GetWeekStop(DateTime date) {
DateTime weekStart;
int sunday = 7;
int crtDay = (int)date.DayOfWeek;
if (date.DayOfWeek == DayOfWeek.Sunday)
crtDay = 7;
int difference = sunday - crtDay;
weekStart = date.AddDays(difference);
return weekStart;
}
public static void GetWeekInterval(int year, int weekNo,
out DateTime weekStart, out DateTime weekStop) {
GetFirstWeekOfYear(year, out weekStart, out weekStop);
if (weekNo == 1)
return;
weekNo--;
int daysToAdd = weekNo * 7;
DateTime dt = weekStart.AddDays(daysToAdd);
GetWeekInterval(dt, out weekStart, out weekStop);
}
public static List<KeyValuePair<DateTime, DateTime>> GetWeekSeries(DateTime toDate) {
//gets week series from beginning of the year
DateTime dtStartYear = new DateTime(toDate.Year, 1, 1);
List<KeyValuePair<DateTime, DateTime>> list = GetWeekSeries(dtStartYear, toDate);
if (list.Count > 0) {
KeyValuePair<DateTime, DateTime> week = list[0];
list[0] = new KeyValuePair<DateTime, DateTime>(dtStartYear, week.Value);
}
return list;
}
public static List<KeyValuePair<DateTime, DateTime>> GetWeekSeries(DateTime fromDate, DateTime toDate) {
if (fromDate > toDate)
return null;
List<KeyValuePair<DateTime, DateTime>> list = new List<KeyValuePair<DateTime, DateTime>>(100);
DateTime weekStart, weekStop;
toDate = GetWeekStop(toDate);
while (fromDate <= toDate) {
GetWeekInterval(fromDate, out weekStart, out weekStop);
list.Add(new KeyValuePair<DateTime, DateTime>(weekStart, weekStop));
fromDate = fromDate.AddDays(7);
}
return list;
}
public static void GetFirstWeekOfYear(int year, out DateTime weekStart, out DateTime weekStop) {
DateTime date = new DateTime(year, 1, 1);
GetWeekInterval(date, out weekStart, out weekStop);
}
public static void GetWeekInterval(DateTime date,
out DateTime dtWeekStart, out DateTime dtWeekStop) {
dtWeekStart = GetWeekStart(date);
dtWeekStop = GetWeekStop(date);
}
#endregion Public Methods
}
This works beautifully! All you have to do is get the first day of the month you want to get the weeks for and then this will give you the first day of every week. You need to get 5 weeks (not 4) so the Enumerable.Range counts out 5 instead of 4.
var date = new DateTime(DateTime.Today.Year, DateTime.Today.Month, 1);
var weeks = from n in Enumerable.Range(0, 5)
select date.AddDays(7 * n + (-1 * (int)date.DayOfWeek));
Here's what i did, using Chaowlert's code as a starting base. Basically i modified that you need to check if adding the days in the for overflows to the next month, so i don't add 4 days (monday to friday), but actually the minimum between 4 and the number of remaining days in the month. Also, i check if the current day is a weekend, otherwise add days until it's a weekday. My purpose is to print the weeks in a month, from monday to friday
DateTime fechaInicio = new DateTime(año, mes, 1);
DateTime fechaFin = fechaInicio.AddMonths(1);
int diasHastaFinMes = 0;
while (esFinDeSemana(fechaInicio))
fechaInicio = fechaInicio.AddDays(1);
for (DateTime fecha = fechaInicio; fecha < fechaFin; fecha = fecha.AddDays(7))
{
diasHastaFinMes = DateTime.DaysInMonth(fecha.Year, fecha.Month) - fecha.Day;
printWeeks(fecha, fecha.AddDays(Math.Min(4, diasHastaFinMes)));
}