Business/Holiday date handling [closed]

Answer 1

I couldn't find anything that did exactly what I wanted so I used the code from http://www.codeproject.com/KB/dotnet/HolidayCalculator.aspx and modified it to fit my needs. It did most of what I needed so it didn't take much tweaking.

Answer 2

Nager.Date supports over 100 countries (US, DE, FR, RU, UK, ...) the library is available for .net45 and .netstandard 2.0. The full country list is available on the github page.

Nuget

PM> install-package Nager.Date

Example:

Get all publicHolidays of a year

var publicHolidays = DateSystem.GetPublicHoliday(2018, CountryCode.DE);

Check if a date a public holiday

var date = new DateTime(2018, 01, 01);
if (DateSystem.IsPublicHoliday(date, CountryCode.DE))
{
    //Yes - New Year's Day
}

Answer 3

The drules project is a library that you can use to generate these sort of rules.

The last Monday in May would be:

roll(*/5/last, -1, mon)

Answer 4

Date::Manip can handle complicated rules, such as good friday. Here's the definition of good friday in the Date::Manip holidays.cnf file I use:

1*0:0:0:0:0:0*EASTER,PD5    = Good Friday

Internally, it has the logic to determine when Easter is based on phases of the moon.

Answer 5

A little late to the party, but figure it will help other people googling it. Found a good answer at http://geekswithblogs.net/wpeck/archive/2011/12/27/us-holiday-list-in-c.aspx. It even takes into account holidays that fall on a weekend.

private static HashSet<DateTime> GetHolidays(int year) 
{ 
    HashSet<DateTime> holidays = new HashSet<DateTime>();

    // New Years
    DateTime newYearsDate = AdjustForWeekendHoliday(new DateTime(year, 1, 1)); 
    holidays.Add(newYearsDate); 

    // Memorial Day -- last monday in May 
    DateTime memorialDay = new DateTime(year, 5, 31); 
    DayOfWeek dayOfWeek = memorialDay.DayOfWeek; 
    while (dayOfWeek != DayOfWeek.Monday) 
    { 
        memorialDay = memorialDay.AddDays(-1); 
        dayOfWeek = memorialDay.DayOfWeek; 
    } 
    holidays.Add(memorialDay); 
    
    // Independence Day
    DateTime independenceDay = AdjustForWeekendHoliday(new DateTime(year, 7, 4)); 
    holidays.Add(independenceDay); 
 
    // Labor Day -- 1st Monday in September 
    DateTime laborDay = new DateTime(year, 9, 1); 
    dayOfWeek = laborDay.DayOfWeek; 
    while(dayOfWeek != DayOfWeek.Monday) 
    { 
        laborDay = laborDay.AddDays(1); 
        dayOfWeek = laborDay.DayOfWeek; 
    } 
    holidays.Add(laborDay);

    // Thanksgiving Day -- 4th Thursday in November 
    var thanksgiving = (from day in Enumerable.Range(1, 30) 
                   where new DateTime(year, 11, day).DayOfWeek == DayOfWeek.Thursday 
                   select day).ElementAt(3); 
    DateTime thanksgivingDay = new DateTime(year, 11, thanksgiving); 
    holidays.Add(thanksgivingDay);

    // Christmas Day 
    DateTime christmasDay = AdjustForWeekendHoliday(new DateTime(year, 12, 25)); 
    holidays.Add(christmasDay); 

    // Next year's new years check
    DateTime nextYearNewYearsDate = AdjustForWeekendHoliday(new DateTime(year + 1, 1, 1));
    if (nextYearNewYearsDate.Year == year)
    holidays.Add(nextYearNewYearsDate);

    return holidays; 
}

public static DateTime AdjustForWeekendHoliday(DateTime holiday) 
{ 
    if (holiday.DayOfWeek == DayOfWeek.Saturday) 
    { 
        return holiday.AddDays(-1); 
    } 
    else if (holiday.DayOfWeek == DayOfWeek.Sunday) 
    { 
        return holiday.AddDays(1); 
    } 
    else 
    { 
        return holiday; 
    } 
}

Answer 6

Here is a Business hours calculator which also handles Market Holidays used by financial institutions. It checks for all the 9 Market Holidays and you can tweak your Business hours for weekdays or weekends.

Business Hours Calculator