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copied!<p>Based on Joaquim's answer, but fixing the calculation when end date month is less than start date month, and adding code to handle end date before start date:</p> <pre><code> public static class GeneralHelper { public static int GetYears(DateTime startDate, DateTime endDate) { if (endDate < startDate) return -GetYears(endDate, startDate); int years = (endDate.Year - startDate.Year); if (endDate.Year == startDate.Year) return years; if (endDate.Month < startDate.Month) return years - 1; if (endDate.Month == startDate.Month && endDate.Day < startDate.Day) return years - 1; return years; } public static int GetMonths(DateTime startDate, DateTime endDate) { if (startDate > endDate) return -GetMonths(endDate, startDate); int months = 12 * GetYears(startDate, endDate); if (endDate.Month > startDate.Month) months = months + endDate.Month - startDate.Month; else months = 12 - startDate.Month + endDate.Month; if (endDate.Day < startDate.Day) months = months - 1; return months; } } [TestClass()] public class GeneralHelperTest { [TestMethod] public void GetYearsTest() { Assert.AreEqual(0, GeneralHelper.GetYears(new DateTime(2000, 5, 5), new DateTime(2000, 12, 31))); Assert.AreEqual(0, GeneralHelper.GetYears(new DateTime(2000, 5, 5), new DateTime(2001, 4, 4))); Assert.AreEqual(0, GeneralHelper.GetYears(new DateTime(2000, 5, 5), new DateTime(2001, 5, 4))); Assert.AreEqual(1, GeneralHelper.GetYears(new DateTime(2000, 5, 5), new DateTime(2001, 5, 5))); Assert.AreEqual(1, GeneralHelper.GetYears(new DateTime(2000, 5, 5), new DateTime(2001, 12, 31))); Assert.AreEqual(0, GeneralHelper.GetYears(new DateTime(2000, 12, 31), new DateTime(2000, 5, 5))); Assert.AreEqual(0, GeneralHelper.GetYears(new DateTime(2001, 4, 4), new DateTime(2000, 5, 5))); Assert.AreEqual(0, GeneralHelper.GetYears(new DateTime(2001, 5, 4), new DateTime(2000, 5, 5))); Assert.AreEqual(-1, GeneralHelper.GetYears(new DateTime(2001, 5, 5), new DateTime(2000, 5, 5))); Assert.AreEqual(-1, GeneralHelper.GetYears(new DateTime(2001, 12, 31), new DateTime(2000, 5, 5))); } [TestMethod] public void GetMonthsTest() { Assert.AreEqual(0, GeneralHelper.GetMonths(new DateTime(2000, 5, 5), new DateTime(2000, 6, 4))); Assert.AreEqual(1, GeneralHelper.GetMonths(new DateTime(2000, 5, 5), new DateTime(2000, 6, 5))); Assert.AreEqual(1, GeneralHelper.GetMonths(new DateTime(2000, 5, 5), new DateTime(2000, 6, 6))); Assert.AreEqual(11, GeneralHelper.GetMonths(new DateTime(2000, 5, 5), new DateTime(2001, 5, 4))); Assert.AreEqual(12, GeneralHelper.GetMonths(new DateTime(2000, 5, 5), new DateTime(2001, 5, 5))); Assert.AreEqual(13, GeneralHelper.GetMonths(new DateTime(2000, 5, 5), new DateTime(2001, 6, 6))); Assert.AreEqual(0, GeneralHelper.GetMonths(new DateTime(2000, 6, 4), new DateTime(2000, 5, 5))); Assert.AreEqual(-1, GeneralHelper.GetMonths(new DateTime(2000, 6, 5), new DateTime(2000, 5, 5))); Assert.AreEqual(-1, GeneralHelper.GetMonths(new DateTime(2000, 6, 6), new DateTime(2000, 5, 5))); Assert.AreEqual(-11, GeneralHelper.GetMonths(new DateTime(2001, 5, 4), new DateTime(2000, 5, 5))); Assert.AreEqual(-12, GeneralHelper.GetMonths(new DateTime(2001, 5, 5), new DateTime(2000, 5, 5))); Assert.AreEqual(-13, GeneralHelper.GetMonths(new DateTime(2001, 6, 6), new DateTime(2000, 5, 5))); } } </code></pre> <p><strong>EDIT</strong> No that still doesn't work. It fails this test:</p> <pre><code>Assert.AreEqual(24, GeneralHelper.GetMonths(new DateTime(2000, 5, 5), new DateTime(2003, 5, 5))); </code></pre> <p>Expected:<24>. Actual:<12></p>

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