DotNet 4.8.1 build of DotNetBar

PROMS/DotNetBar Source Code/DevComponents.DotNetBar.Schedule/DateHelper.cs

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+#if FRAMEWORK20
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Windows;
+using System.Globalization;
+
+namespace DevComponents.DotNetBar.Schedule
+{
+    internal static class DateHelper
+    {
+        #region Date/Time Helpers
+
+        /// <summary>
+        /// Returns the date that is 30 minutes before or after input date if input date minute is 0 or 30. Otherwise it returns next increment to 0 or 30.
+        /// </summary>
+        /// <param name="date">Date and time.</param>
+        /// <param name="forward">Indicates whether to add or subtract minutes.</param>
+        /// <returns>New date time.</returns>
+        public static DateTime GetNext30Minute(DateTime date, bool forward)
+        {
+            if (date.Minute == 0 || date.Minute == 30)
+                return (date.AddMinutes(forward ? 30 : -30));
+
+            return (date.AddMinutes((forward ? 1 : -1) * Math.Abs(30 - date.Minute)));
+        }
+
+        /// <summary>
+        /// Returns date that starts with the day. If passed date is not on the requested date function returns first date with day that is before passed date.
+        /// </summary>
+        /// <param name="date">Date to inspect.</param>
+        /// <param name="dayOfWeek">Day of week</param>
+        /// <returns>Date that starts on given day of week.</returns>
+        public static DateTime GetDateForDayOfWeek(DateTime date, DayOfWeek dayOfWeek)
+        {
+            if (date.DayOfWeek != dayOfWeek)
+            {
+                // Go back to the first day of week
+                while (date.DayOfWeek != dayOfWeek)
+                {
+                    date = date.AddDays(-1);
+                }
+            }
+
+            return (date);
+        }
+
+        public static DateTime GetEndOfWeek(DateTime date, DayOfWeek lastDayOfWeek)
+        {
+            while (date.DayOfWeek != lastDayOfWeek)
+                date = date.AddDays(1);
+
+            return (date);
+        }
+
+        internal static DayOfWeek GetFirstDayOfWeek()
+        {
+            return (ScheduleSettings.GetActiveCulture().DateTimeFormat.FirstDayOfWeek);
+        }
+
+        internal static DayOfWeek GetLastDayOfWeek()
+        {
+            DayOfWeek firstDay = GetFirstDayOfWeek();
+
+            int lastDay = (int)firstDay + 6;
+
+            if (lastDay > 6) 
+                lastDay = lastDay - 7;
+
+            return (DayOfWeek)lastDay;
+        }
+
+        /// <summary>
+        /// Returns whether two days fall on same month and year.
+        /// </summary>
+        /// <param name="date1">First date</param>
+        /// <param name="date2">Second date</param>
+        /// <returns>true if dates are on same month and year</returns>
+        public static bool IsSameMonth(DateTime date1, DateTime date2)
+        {
+            return (date1.Year == date2.Year && date1.Month == date2.Month);
+        }
+
+        public static DayOfWeek GetNextDay(DayOfWeek currentDay)
+        {
+            if ((int)currentDay == 6) 
+                return (DayOfWeek)0;
+
+            return (DayOfWeek)(currentDay + 1);
+        }
+
+        /// <summary>
+        /// Returns true if time periods overlap.
+        /// </summary>
+        /// <param name="startTime1">Start of first period.</param>
+        /// <param name="endTime1">End of first period.</param>
+        /// <param name="startTime2">Start of second period.</param>
+        /// <param name="endTime2">End of second period.</param>
+        /// <returns>true if periods overlap</returns>
+        public static bool TimePeriodsOverlap(DateTime startTime1, DateTime endTime1, DateTime startTime2, DateTime endTime2)
+        {
+            return (startTime1 <= startTime2 && endTime1 > startTime2 ||
+                startTime1 >= startTime2 && startTime1 < endTime2);
+        }
+
+        public static int GetNumberOfWeeks(DateTime startDate, DateTime endDate)
+        {
+            if (startDate == DateTime.MinValue && endDate == DateTime.MinValue)
+            {
+                startDate = DateTime.Today.Date;
+                endDate = startDate.AddMonths(1);
+            }
+
+            if (startDate == DateTime.MinValue || endDate == DateTime.MinValue || endDate < startDate)
+            {
+                return (0);
+            }
+
+            endDate = GetEndOfWeek(endDate, DateHelper.GetLastDayOfWeek());
+            startDate = GetDateForDayOfWeek(startDate, DateHelper.GetFirstDayOfWeek());
+
+            return ((int)Math.Max(Math.Ceiling(endDate.Subtract(startDate).TotalDays / 7), 1));
+        }
+
+        /// <summary>
+        /// Gets the abbreviated month name for
+        /// the given date
+        /// </summary>
+        /// <param name="date">Date</param>
+        /// <returns>Abbreviated name</returns>
+        public static string GetThreeLetterMonth(DateTime date)
+        {
+            CultureInfo ci = ScheduleSettings.GetActiveCulture();
+
+            return (ci.DateTimeFormat.GetAbbreviatedMonthName(date.Month));
+        }
+
+        /// <summary>
+        /// Gets the abbreviated day name for
+        /// the given date
+        /// </summary>
+        /// <param name="dayOfWeek">Day of week</param>
+        /// <returns>Abbreviated name</returns>
+        public static string GetThreeLetterDayOfWeek(DayOfWeek dayOfWeek)
+        {
+            CultureInfo ci = ScheduleSettings.GetActiveCulture();
+
+            return (ci.DateTimeFormat.GetAbbreviatedDayName(dayOfWeek));
+        }
+
+        #endregion
+    }
+}
+#endif