Yadelib is yet another date extensions library written in C#. Its core functionality is to provide a convenient way of determining if any given date is a working day or not. Built-in definitions of non-working days can easily be extended or overriden completely. Yadelib fully leverages .NET's 6 DateOnly data type.
Extension methods on the DateOnly, DateTime, and DateTimeOffset types make it easy to access yadelib's functionality. If needed, convert a DateTime(Offset) into a DateOnly using the .ToDateOnly() extension. Afterwards, yadelib's feature set is available to you.
An optional input to all of the extension methods is an instance of the NonWorkingDays class. This assumes a set of non-working days by default, which yadelib then uses to determine the working day status of a date. Currently, Gregorian Easter-based holidays and some German public holidays are supported for the default.
As default, Easter-based holidays are not workdays:
using Yadelib;
using static System.Console;
// Easter sunday 2022 was on April 17th
var d = new DateOnly(2022, 4, 18);
WriteLine(d.IsWorkingDay()); //falseIf not specified otherwise, weekends are on Saturdays and Sundays. This can be customised. Assume saturdays are workdays:
using Yadelib;
using Yadelib.Models;
using static System.Console;
var d = new DateOnly(2022, 4, 30);
var nwd = new NonWorkingDays
{
Weekend = new DayOfWeek[] { DayOfWeek.Sunday }
};
WriteLine(d.IsWorkingDay()); //false
WriteLine(d.IsWorkingDay(nwd)); //trueGet the 5th working day a month:
using Yadelib;
using Yadelib.Models;
using static System.Console;
var d = new DateOnly(2023, 5, 1);
var nwd = new NonWorkingDays
{
Weekend = new DayOfWeek[] { DayOfWeek.Sunday }
};
WriteLine(d.GetXthWorkingDay(5)); //2023-05-08
WriteLine(d.GetXthWorkingDay(5, startFromEnd: true)); //2023-05-24; note: 2023-05-29 is a holiday
WriteLine(d.GetXthWorkingDay(5, nonWorkingDays: nwd)); //2023-05-06Get last day of the month:
using Yadelib;
using static System.Console;
var d = new DateOnly(2022, 7, 1);
WriteLine(d.GetLastWorkingDay()); //2022-07-29Get adjacent workday:
using Yadelib;
using Yadelib.Models;
using static System.Console;
var d = new DateOnly(2023, 5, 2);
var nwd = new NonWorkingDays
{
CustomNonWorkingsDays = new DateOnly[]
{
new (2023, 5, 3),
new (2023, 5, 4)
}
};
WriteLine(d.GetPreviousWorkingDay()); //2023-04-28
WriteLine(d.AddWorkingDays(-1)); //2023-04-28
WriteLine(d.GetNextWorkingDay(nwd)); //2023-05-05