diff --git a/VisualCard.Calendar/Parts/Implementations/RecDateInfo.cs b/VisualCard.Calendar/Parts/Implementations/RecDateInfo.cs
index a61aeec..b8e0eee 100644
--- a/VisualCard.Calendar/Parts/Implementations/RecDateInfo.cs
+++ b/VisualCard.Calendar/Parts/Implementations/RecDateInfo.cs
@@ -36,7 +36,7 @@ public class RecDateInfo : BaseCalendarPartInfo, IEquatable<RecDateInfo>
         /// <summary>
         /// The recurrence date list
         /// </summary>
-        public DateTimeOffset[]? RecDates { get; }
+        public TimePeriod[]? RecDates { get; }
 
         internal static BaseCalendarPartInfo FromStringVcalendarStatic(string value, string[] finalArgs, string[] elementTypes, string valueType, Version cardVersion) =>
             new RecDateInfo().FromStringVcalendarInternal(value, finalArgs, elementTypes, valueType, cardVersion);
@@ -48,20 +48,44 @@ internal override string ToStringVcalendarInternal(Version cardVersion)
 
             var builder = new StringBuilder();
             if (cardVersion.Major == 1)
-                builder.Append(string.Join(";", RecDates.Select((dt) => VcardCommonTools.SavePosixDate(dt))));
+                builder.Append(string.Join(";", RecDates.Select((dt) => VcardCommonTools.SavePosixDate(dt.StartDate))));
             else
-                builder.Append(VcardCommonTools.SavePosixDate(RecDates[0]));
+            {
+                builder.Append(VcardCommonTools.SavePosixDate(RecDates[0].StartDate));
+                if (RecDates[0].StartDate != RecDates[0].EndDate)
+                    builder.Append("/" + VcardCommonTools.SavePosixDate(RecDates[0].EndDate));
+            }
             return builder.ToString();
         }
 
         internal override BaseCalendarPartInfo FromStringVcalendarInternal(string value, string[] finalArgs, string[] elementTypes, string valueType, Version cardVersion)
         {
             // Populate the fields
-            var recDateStrings =
-                cardVersion.Major == 1 ?
-                Regex.Unescape(value).Split(';') :
-                [Regex.Unescape(value)];
-            var recDates = recDateStrings.Select((date) => VcardCommonTools.ParsePosixDate(date)).ToArray();
+            TimePeriod[] recDates = [];
+            if (cardVersion.Major == 1)
+            {
+                var recDateStrings = Regex.Unescape(value).Split(';');
+                recDates = recDateStrings.Select((date) =>
+                {
+                    var parsedDate = VcardCommonTools.ParsePosixDate(date);
+                    return new TimePeriod(parsedDate, parsedDate);
+                }).ToArray();
+            }
+            else
+            {
+                // Check to see if it's a period
+                try
+                {
+                    var parsedPeriod = VcardCommonTools.GetTimePeriod(value);
+                    recDates = [parsedPeriod];
+                }
+                catch
+                {
+                    // Not a period. Continue using normal date and time
+                    var parsedDate = VcardCommonTools.ParsePosixDate(value);
+                    recDates = [new TimePeriod(parsedDate, parsedDate)];
+                }
+            }
 
             // Add the fetched information
             RecDateInfo _time = new([], elementTypes, valueType, recDates);
@@ -103,7 +127,7 @@ public override int GetHashCode()
         {
             int hashCode = 498518712;
             hashCode = hashCode * -1521134295 + base.GetHashCode();
-            hashCode = hashCode * -1521134295 + EqualityComparer<DateTimeOffset[]?>.Default.GetHashCode(RecDates);
+            hashCode = hashCode * -1521134295 + EqualityComparer<TimePeriod[]?>.Default.GetHashCode(RecDates);
             return hashCode;
         }
 
@@ -120,7 +144,7 @@ internal override bool EqualsInternal(BaseCalendarPartInfo source, BaseCalendarP
 
         internal RecDateInfo() { }
 
-        internal RecDateInfo(string[] arguments, string[] elementTypes, string valueType, DateTimeOffset[] recDates) :
+        internal RecDateInfo(string[] arguments, string[] elementTypes, string valueType, TimePeriod[] recDates) :
             base(arguments, elementTypes, valueType)
         {
             RecDates = recDates;
diff --git a/VisualCard/Parsers/VcardCommonTools.cs b/VisualCard/Parsers/VcardCommonTools.cs
index 136a9f4..20a91fd 100644
--- a/VisualCard/Parsers/VcardCommonTools.cs
+++ b/VisualCard/Parsers/VcardCommonTools.cs
@@ -166,6 +166,7 @@ public static string SaveUtcOffset(TimeSpan utcOffsetRepresentation)
         /// <param name="duration">Duration specifier in the ISO-8601:2004 format</param>
         /// <param name="modern">Whether to disable parsing years and months or not</param>
         /// <param name="utc">Whether to use UTC</param>
+        /// <param name="source">Source date/time</param>
         /// <returns>A date/time offset instance and a time span instance from the duration specifier</returns>
         /// <exception cref="ArgumentException"></exception>
         public static (DateTimeOffset result, TimeSpan span) GetDurationSpan(string duration, bool modern = false, bool utc = true, DateTimeOffset? source = null)