Monthly calendar basics.

Wino.Core.Domain/Extensions/DateTimeExtensions.cs

@@ -0,0 +1,33 @@
+using System;
+using Wino.Core.Domain.Models.Calendar;
+
+namespace Wino.Core.Domain.Extensions
+{
+    public static class DateTimeExtensions
+    {
+        /// <summary>
+        /// Returns a date range for the month of the given date.
+        /// </summary>
+        /// <param name="date">Date to get range for.</param>
+        public static DateRange GetMonthDateRangeStartingWeekday(this DateTime date, DayOfWeek WeekStartDay)
+        {
+            DateTime firstDayOfMonth = new DateTime(date.Year, date.Month, 1);
+
+            int daysToSubtract = (7 + (firstDayOfMonth.DayOfWeek - WeekStartDay)) % 7;
+            DateTime rangeStart = firstDayOfMonth.AddDays(-daysToSubtract);
+
+            DateTime rangeEnd = rangeStart.AddDays(34);
+
+            return new DateRange(rangeStart, rangeEnd);
+        }
+
+        public static DateTime GetWeekStartDateForDate(this DateTime date, DayOfWeek firstDayOfWeek)
+        {
+            // Detect the first day of the week that contains the selected date.
+            int diff = (7 + (date.DayOfWeek - firstDayOfWeek)) % 7;
+
+            // Start loading from this date instead of visible date.
+            return date.AddDays(-diff).Date;
+        }
+    }
+}