DateRecurrenceR

No AI, just math.

Efficient Date Recurrence Library for .NET

DateRecurrenceR is a .NET library designed to handle and manage recurrence date patterns efficiently.

Key Features

• Dynamic Subrange Generation: Generate only the needed dates within a specified range, optimizing performance and memory usage.
• Time Localization Simplification: Uses DateOnly, eliminating issues related to time localization.
• Flexible Collection Handling: Returns an enumerator, allowing developers to choose the collection type.
• Optimal Performance: Boasts a Big O notation of O(1), ensuring efficient operations.

Methods for Recurrences

method	description
Daily	Gets a daily recurrence by interval
Weekly	Gets a weekly recurrence by days of week and interval
Monthly	Gets a monthly recurrence by days of week or day of month and interval
Yearly	Gets an yearly recurrence by days of week or day of month or day of year and interval

All these methods return an instance of IEnumerator<DateOnly>.

All parameters

parameter	description
beginDate	The date when the recurrence begins.
endDate	The date when the recurrence ends.
interval	The interval between occurrences.
fromDate	The date when a specific range starts.
toDate	The date when a specific range finishes.
count	The maximum number of contiguous dates.
dayOfWeek	The day of the week.
dayOfMonth	The day of the month. Takes the last day of the month if dayOfMonth is more than the days in the month.
dayOfYear	The day of the year.
weekDays	Days of the week.
indexOfDay	Index of dayOfWeek in the month.
numberOfMonth	The number of the month.
firstDayOfWeek	The first day of the week.

Subranges

All methods for recurrences support the following subrange rules:

By dates

• Parameters: fromDate and toDate
• Rule: Takes dates from the intersection [beginDate, endDate] ∪ [fromDate, toDate]

By count

• Parameters: fromDate and count
• Rule: Takes dates from the intersection [beginDate, endDate] ∪ [fromDate, DateOnly.MaxValue] and takes the first count dates

Examples of Use

var enumerator = Recurrence.Daily(beginDate, endDate, fromDate, toDate, interval); // IEnumerator<DateOnly>

Installing DateRecurrenceR

You can install DateRecurrenceR via NuGet:

Package Manager Console:

Install-Package DateRecurrenceR

.NET Core CLI:

dotnet add package DateRecurrenceR