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Extended the implementation of the EssentialsMonth class
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‎src/Skybrud.Essentials/Time/EssentialsMonth.cs‎

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using System;
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using System.Collections.Generic;
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namespace Skybrud.Essentials.Time {
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@@ -99,6 +100,87 @@ public EssentialsMonth(EssentialsTime timestamp, TimeZoneInfo timeZone) {
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#endregion
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#region Member methods
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/// <summary>
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/// Returns a new instance representing the previous month, according to the local time zone.
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/// </summary>
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/// <returns>An instance of <see cref="EssentialsMonth"/>.</returns>
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public EssentialsMonth GetPrevious() {
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return new EssentialsMonth(Start.GetStartOfMonth(TimeZoneInfo.Local).AddDays(-1));
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}
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/// <summary>
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/// Returns a new instance representing the previous month, according to the specified <paramref name="timeZone"/>.
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/// </summary>
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/// <param name="timeZone">The time zone to be used for calculating the start and end dates.</param>
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/// <returns>An instance of <see cref="EssentialsMonth"/>.</returns>
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public EssentialsMonth GetPrevious(TimeZoneInfo timeZone) {
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return new EssentialsMonth(Start.GetStartOfMonth(timeZone).AddDays(-1));
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}
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/// <summary>
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/// Returns a new instance representing the next month, according to the local time zone.
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/// </summary>
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/// <returns>An instance of <see cref="EssentialsMonth"/>.</returns>
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public EssentialsMonth GetNext() {
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return new EssentialsMonth(End.GetEndOfMonth(TimeZoneInfo.Local).AddDays(+1));
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}
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/// <summary>
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/// Returns a new instance representing the next month, according to the specified <paramref name="timeZone"/>.
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/// </summary>
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/// <param name="timeZone">The time zone to be used for calculating the start and end dates.</param>
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/// <returns>An instance of <see cref="EssentialsMonth"/>.</returns>
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public EssentialsMonth GetNext(TimeZoneInfo timeZone) {
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return new EssentialsMonth(End.GetEndOfMonth(timeZone).AddDays(+1));
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}
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#endregion
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#region Static methods
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/// <summary>
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/// Returns an array with the months from <paramref name="startYear"/> and <paramref name="startMonth"/>.
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///
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/// Start and end dates of each month are calculated based on <see cref="TimeZoneInfo.Local"/>.
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/// </summary>
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/// <param name="startYear">The year of the starting month.</param>
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/// <param name="startMonth">The starting month.</param>
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/// <param name="months">The amount of month, including the start month.</param>
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/// <returns>An array of <see cref="EssentialsMonth"/>.</returns>
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public static EssentialsMonth[] GetMonths(int startYear, int startMonth, int months) {
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return GetMonths(startYear, startMonth, months, TimeZoneInfo.Local);
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}
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/// <summary>
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/// Returns an array with the months from <paramref name="startYear"/> and <paramref name="startMonth"/>.
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///
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/// Start and end dates of each month are calculated based on <paramref name="timeZone"/>.
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/// </summary>
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/// <param name="startYear">The year of the starting month.</param>
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/// <param name="startMonth">The starting month.</param>
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/// <param name="months">The amount of month, including the start month.</param>
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/// <param name="timeZone">The time zone to be used for calculating the start and end dates.</param>
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/// <returns>An array of <see cref="EssentialsMonth"/>.</returns>
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public static EssentialsMonth[] GetMonths(int startYear, int startMonth, int months, TimeZoneInfo timeZone) {
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List<EssentialsMonth> temp = new List<EssentialsMonth>();
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int year = startYear;
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for (int i = 0; i < months; i++) {
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int month = (startMonth + i - 1) % 12 + 1;
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if (i > 0 && month == 1) year++;
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temp.Add(new EssentialsMonth(year, month, timeZone));
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}
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return temp.ToArray();
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}
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#endregion
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}
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}

‎src/UnitTestProject1/Time/Time/EssentialMonthTests.cs‎

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}
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[TestMethod]
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public void GetPrevious1() {
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TimeZoneInfo romance = TimeZoneInfo.FindSystemTimeZoneById("Romance Standard Time");
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EssentialsMonth month = new EssentialsMonth(2021, 4, romance);
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Assert.AreEqual("2021-04-01T00:00:00+02:00", month.Start.Iso8601);
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Assert.AreEqual("2021-04-30T23:59:59+02:00", month.End.Iso8601);
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EssentialsMonth previous = month.GetPrevious(romance);
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Assert.AreEqual("2021-03-01T00:00:00+01:00", previous.Start.Iso8601);
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Assert.AreEqual("2021-03-31T23:59:59+02:00", previous.End.Iso8601);
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}
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[TestMethod]
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public void GetNext1() {
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TimeZoneInfo romance = TimeZoneInfo.FindSystemTimeZoneById("Romance Standard Time");
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EssentialsMonth month = new EssentialsMonth(2021, 3, romance);
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Assert.AreEqual("2021-03-01T00:00:00+01:00", month.Start.Iso8601);
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Assert.AreEqual("2021-03-31T23:59:59+02:00", month.End.Iso8601);
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EssentialsMonth next = month.GetNext(romance);
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Assert.AreEqual("2021-04-01T00:00:00+02:00", next.Start.Iso8601);
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Assert.AreEqual("2021-04-30T23:59:59+02:00", next.End.Iso8601);
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}
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[TestMethod]
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public void GetMonths1() {
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TimeZoneInfo romance = TimeZoneInfo.FindSystemTimeZoneById("Romance Standard Time");
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var period = EssentialsMonth.GetMonths(2021, 1, 12, romance);
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Assert.AreEqual(12, period.Length);
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Assert.AreEqual(2021, period[0].Year);
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Assert.AreEqual(1, period[0].Month);
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Assert.AreEqual(2021, period[1].Year);
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Assert.AreEqual(2, period[1].Month);
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Assert.AreEqual(2021, period[2].Year);
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Assert.AreEqual(3, period[2].Month);
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Assert.AreEqual(2021, period[3].Year);
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Assert.AreEqual(4, period[3].Month);
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Assert.AreEqual(2021, period[4].Year);
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Assert.AreEqual(5, period[4].Month);
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Assert.AreEqual(2021, period[5].Year);
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Assert.AreEqual(6, period[5].Month);
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Assert.AreEqual(2021, period[6].Year);
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Assert.AreEqual(7, period[6].Month);
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Assert.AreEqual(2021, period[7].Year);
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Assert.AreEqual(8, period[7].Month);
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Assert.AreEqual(2021, period[8].Year);
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Assert.AreEqual(9, period[8].Month);
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Assert.AreEqual(2021, period[9].Year);
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Assert.AreEqual(10, period[9].Month);
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Assert.AreEqual(2021, period[10].Year);
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Assert.AreEqual(11, period[10].Month);
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Assert.AreEqual(2021, period[11].Year);
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Assert.AreEqual(12, period[11].Month);
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}
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[TestMethod]
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public void GetMonths2() {
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TimeZoneInfo romance = TimeZoneInfo.FindSystemTimeZoneById("Romance Standard Time");
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var period = EssentialsMonth.GetMonths(2021, 7, 12, romance);
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Assert.AreEqual(12, period.Length);
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Assert.AreEqual(2021, period[0].Year);
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Assert.AreEqual(7, period[0].Month);
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Assert.AreEqual(2021, period[1].Year);
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Assert.AreEqual(8, period[1].Month);
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Assert.AreEqual(2021, period[2].Year);
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Assert.AreEqual(9, period[2].Month);
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Assert.AreEqual(2021, period[3].Year);
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Assert.AreEqual(10, period[3].Month);
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Assert.AreEqual(2021, period[4].Year);
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Assert.AreEqual(11, period[4].Month);
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Assert.AreEqual(2021, period[5].Year);
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Assert.AreEqual(12, period[5].Month);
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Assert.AreEqual(2022, period[6].Year);
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Assert.AreEqual(1, period[6].Month);
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Assert.AreEqual(2022, period[7].Year);
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Assert.AreEqual(2, period[7].Month);
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Assert.AreEqual(2022, period[8].Year);
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Assert.AreEqual(3, period[8].Month);
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Assert.AreEqual(2022, period[9].Year);
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Assert.AreEqual(4, period[9].Month);
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Assert.AreEqual(2022, period[10].Year);
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Assert.AreEqual(5, period[10].Month);
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Assert.AreEqual(2022, period[11].Year);
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Assert.AreEqual(6, period[11].Month);
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}
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}
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}

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