diff --git a/src/main/java/cz/smarteon/loxone/calendar/CalEntryBase.java b/src/main/java/cz/smarteon/loxone/calendar/CalEntryBase.java
index 5a9b91e..0788db7 100644
--- a/src/main/java/cz/smarteon/loxone/calendar/CalEntryBase.java
+++ b/src/main/java/cz/smarteon/loxone/calendar/CalEntryBase.java
@@ -32,6 +32,7 @@ public abstract class CalEntryBase {
 
     protected static final String CREATE_ENTRY = "calendarcreateentry/";
     protected static final String DELETE_ENTRY = "calendardeleteentry/";
+    protected static final String UPDATE_ENTRY = "calendarupdateentry/";
 
     /**
      * UUID of this calendar entry, should be unique.
@@ -95,5 +96,18 @@ public CalendarCommand<EmptyValue> deleteEntryCommand(){
      *
      * @return create calendar entry command
      */
-    abstract public CalendarCommand<EmptyValue> createEntryCommand();
+    public CalendarCommand<EmptyValue> createEntryCommand() {
+        return new CalendarCommand<>(CREATE_ENTRY + this, EmptyValue.class);
+    }
+
+    /**
+     * Creates update calendar entry command.
+     * Command updates an existing calendar entry with the given parameters.
+     *
+     * @return update calendar entry command
+     * @param uuid - uuid of an existing entry to be updated
+     */
+    public CalendarCommand<EmptyValue> updateEntryCommand(LoxoneUuid uuid) {
+        return new CalendarCommand<>(UPDATE_ENTRY + uuid + "/" + this, EmptyValue.class);
+    }
 }
diff --git a/src/main/java/cz/smarteon/loxone/calendar/CalEntryDayOfWeek.java b/src/main/java/cz/smarteon/loxone/calendar/CalEntryDayOfWeek.java
index 668dc63..ad2a639 100644
--- a/src/main/java/cz/smarteon/loxone/calendar/CalEntryDayOfWeek.java
+++ b/src/main/java/cz/smarteon/loxone/calendar/CalEntryDayOfWeek.java
@@ -5,7 +5,6 @@
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import cz.smarteon.loxone.LoxoneUuid;
-import cz.smarteon.loxone.user.EmptyValue;
 import lombok.AllArgsConstructor;
 import lombok.Getter;
 import lombok.Setter;
@@ -85,7 +84,8 @@ public CalEntryDayOfWeek(
         this.weekDayInMonth = weekDayInMonth.value;
     }
 
-    public CalendarCommand<EmptyValue> createEntryCommand(){
-        return new CalendarCommand<>(CREATE_ENTRY + name + "/" + operatingMode + "/" + CAL_MODE + "/" + weekDayInMonth + "/" + weekDay + "/" + startMonth, EmptyValue.class);
+    @Override
+    public String toString() {
+        return name + "/" + operatingMode + "/" + CAL_MODE + "/" + weekDayInMonth + "/" + weekDay + "/" + startMonth;
     }
 }
diff --git a/src/main/java/cz/smarteon/loxone/calendar/CalEntryEasterOffset.java b/src/main/java/cz/smarteon/loxone/calendar/CalEntryEasterOffset.java
index f3111c3..6577882 100644
--- a/src/main/java/cz/smarteon/loxone/calendar/CalEntryEasterOffset.java
+++ b/src/main/java/cz/smarteon/loxone/calendar/CalEntryEasterOffset.java
@@ -5,7 +5,6 @@
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import cz.smarteon.loxone.LoxoneUuid;
-import cz.smarteon.loxone.user.EmptyValue;
 import lombok.Getter;
 import lombok.Setter;
 import org.jetbrains.annotations.NotNull;
@@ -46,7 +45,8 @@ public CalEntryEasterOffset(
         this.easterOffset = easterOffset;
     }
 
-    public CalendarCommand<EmptyValue> createEntryCommand(){
-        return new CalendarCommand<>(CREATE_ENTRY + name + "/" + operatingMode + "/" + CAL_MODE + "/" + easterOffset, EmptyValue.class);
+    @Override
+    public String toString() {
+        return name + "/" + operatingMode + "/" + CAL_MODE + "/" + easterOffset;
     }
 }
diff --git a/src/main/java/cz/smarteon/loxone/calendar/CalEntryEveryYear.java b/src/main/java/cz/smarteon/loxone/calendar/CalEntryEveryYear.java
index e6e4a75..9014702 100644
--- a/src/main/java/cz/smarteon/loxone/calendar/CalEntryEveryYear.java
+++ b/src/main/java/cz/smarteon/loxone/calendar/CalEntryEveryYear.java
@@ -5,7 +5,6 @@
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import cz.smarteon.loxone.LoxoneUuid;
-import cz.smarteon.loxone.user.EmptyValue;
 import lombok.Getter;
 import lombok.Setter;
 import org.jetbrains.annotations.NotNull;
@@ -55,7 +54,8 @@ public CalEntryEveryYear(
         this.startDay = startDay;
     }
 
-    public CalendarCommand<EmptyValue> createEntryCommand(){
-        return new CalendarCommand<>(CREATE_ENTRY + name + "/" + operatingMode + "/" + CAL_MODE + "/" + startMonth + "/" + startDay, EmptyValue.class);
+    @Override
+    public String toString() {
+        return name + "/" + operatingMode + "/" + CAL_MODE + "/" + startMonth + "/" + startDay;
     }
 }
diff --git a/src/main/java/cz/smarteon/loxone/calendar/CalEntryPeriod.java b/src/main/java/cz/smarteon/loxone/calendar/CalEntryPeriod.java
index 88bfb3c..9865a3c 100644
--- a/src/main/java/cz/smarteon/loxone/calendar/CalEntryPeriod.java
+++ b/src/main/java/cz/smarteon/loxone/calendar/CalEntryPeriod.java
@@ -5,7 +5,6 @@
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import cz.smarteon.loxone.LoxoneUuid;
-import cz.smarteon.loxone.user.EmptyValue;
 import lombok.Getter;
 import lombok.Setter;
 import org.jetbrains.annotations.NotNull;
@@ -91,7 +90,8 @@ public CalEntryPeriod(
         this.endDay = endDay;
     }
 
-    public CalendarCommand<EmptyValue> createEntryCommand(){
-        return new CalendarCommand<>(CREATE_ENTRY + name + "/" + operatingMode + "/" + CAL_MODE + "/" + startYear + "/" + startMonth + "/" + startDay + "/" + endYear + "/" + endMonth + "/" + endDay, EmptyValue.class);
+    @Override
+    public String toString() {
+        return name + "/" + operatingMode + "/" + CAL_MODE + "/" + startYear + "/" + startMonth + "/" + startDay + "/" + endYear + "/" + endMonth + "/" + endDay;
     }
 }
diff --git a/src/main/java/cz/smarteon/loxone/calendar/CalEntryPeriodYearly.java b/src/main/java/cz/smarteon/loxone/calendar/CalEntryPeriodYearly.java
index 8d8aaf7..c7d647c 100644
--- a/src/main/java/cz/smarteon/loxone/calendar/CalEntryPeriodYearly.java
+++ b/src/main/java/cz/smarteon/loxone/calendar/CalEntryPeriodYearly.java
@@ -5,7 +5,6 @@
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import cz.smarteon.loxone.LoxoneUuid;
-import cz.smarteon.loxone.user.EmptyValue;
 import lombok.Getter;
 import lombok.Setter;
 import org.jetbrains.annotations.NotNull;
@@ -73,7 +72,8 @@ public CalEntryPeriodYearly(
         this.endDay = endDay;
     }
 
-    public CalendarCommand<EmptyValue> createEntryCommand(){
-        return new CalendarCommand<>(CREATE_ENTRY + name + "/" + operatingMode + "/" + CAL_MODE + "/" + startMonth + "/" + startDay + "/" + endMonth + "/" + endDay, EmptyValue.class);
+    @Override
+    public String toString() {
+        return name + "/" + operatingMode + "/" + CAL_MODE + "/" + startMonth + "/" + startDay + "/" + endMonth + "/" + endDay;
     }
 }
diff --git a/src/main/java/cz/smarteon/loxone/calendar/CalEntrySingleDay.java b/src/main/java/cz/smarteon/loxone/calendar/CalEntrySingleDay.java
index ee9416f..8474041 100644
--- a/src/main/java/cz/smarteon/loxone/calendar/CalEntrySingleDay.java
+++ b/src/main/java/cz/smarteon/loxone/calendar/CalEntrySingleDay.java
@@ -5,7 +5,6 @@
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import cz.smarteon.loxone.LoxoneUuid;
-import cz.smarteon.loxone.user.EmptyValue;
 import lombok.Getter;
 import lombok.Setter;
 import org.jetbrains.annotations.NotNull;
@@ -64,7 +63,8 @@ public CalEntrySingleDay(
         this.startDay = startDay;
     }
 
-    public CalendarCommand<EmptyValue> createEntryCommand(){
-        return new CalendarCommand<>(CREATE_ENTRY + name + "/" + operatingMode + "/" + CAL_MODE + "/" + startYear + "/" + startMonth + "/" + startDay, EmptyValue.class);
+    @Override
+    public String toString() {
+        return name + "/" + operatingMode + "/" + CAL_MODE + "/" + startYear + "/" + startMonth + "/" + startDay;
     }
 }
diff --git a/src/main/java/cz/smarteon/loxone/calendar/CalendarCommand.java b/src/main/java/cz/smarteon/loxone/calendar/CalendarCommand.java
index 0348afd..9cfbda6 100644
--- a/src/main/java/cz/smarteon/loxone/calendar/CalendarCommand.java
+++ b/src/main/java/cz/smarteon/loxone/calendar/CalendarCommand.java
@@ -11,7 +11,7 @@ public class CalendarCommand<V extends LoxoneValue> extends LoxoneMessageCommand
 
     private static final String GET_ENTRIES = "calendargetentries/";
 
-    private static final String COMMAND_PREFIX = "jdev/sps/";
+    protected static final String COMMAND_PREFIX = "jdev/sps/";
 
     protected CalendarCommand(String operation, Class<V> valueType) {
         super(requireNonNull(operation, "operation can't be null"),
diff --git a/src/test/kotlin/calendar/CalEntryDayOfWeekTest.kt b/src/test/kotlin/calendar/CalEntryDayOfWeekTest.kt
index c568f6a..4c210c0 100644
--- a/src/test/kotlin/calendar/CalEntryDayOfWeekTest.kt
+++ b/src/test/kotlin/calendar/CalEntryDayOfWeekTest.kt
@@ -22,6 +22,7 @@ class CalEntryDayOfWeekTest {
                 get { weekDayInMonth}.isEqualTo(1)
                 get { weekDay }.isEqualTo(2)
                 get { createEntryCommand().command }.isEqualTo("jdev/sps/calendarcreateentry/Day of week test/1/5/1/2/7")
+                get { updateEntryCommand(this.uuid).command }.isEqualTo("jdev/sps/calendarupdateentry/1b6f49d6-030f-9bc2-ffff504f94a03d3e/Day of week test/1/5/1/2/7")
             }
     }
 
diff --git a/src/test/kotlin/calendar/CalEntryEasterOffsetTest.kt b/src/test/kotlin/calendar/CalEntryEasterOffsetTest.kt
index 6268a95..2d1ae02 100644
--- a/src/test/kotlin/calendar/CalEntryEasterOffsetTest.kt
+++ b/src/test/kotlin/calendar/CalEntryEasterOffsetTest.kt
@@ -20,6 +20,7 @@ class CalEntryEasterOffsetTest {
                 get { calMode }.isEqualTo(1)
                 get { easterOffset }.isEqualTo(11)
                 get { createEntryCommand().command }.isEqualTo("jdev/sps/calendarcreateentry/Eastern offset test/1/1/11")
+                get { updateEntryCommand(this.uuid).command }.isEqualTo("jdev/sps/calendarupdateentry/1b6f47dd-0243-9b2c-ffff504f94a03d3e/Eastern offset test/1/1/11")
             }
     }
 
diff --git a/src/test/kotlin/calendar/CalEntryEveryYearTest.kt b/src/test/kotlin/calendar/CalEntryEveryYearTest.kt
index 859f29d..ba67f04 100644
--- a/src/test/kotlin/calendar/CalEntryEveryYearTest.kt
+++ b/src/test/kotlin/calendar/CalEntryEveryYearTest.kt
@@ -21,6 +21,7 @@ class CalEntryEveryYearTest {
                 get { startMonth }.isEqualTo(4)
                 get { startDay }.isEqualTo(1)
                 get { createEntryCommand().command }.isEqualTo("jdev/sps/calendarcreateentry/Every year test/1/0/4/1")
+                get { updateEntryCommand(this.uuid).command }.isEqualTo("jdev/sps/calendarupdateentry/1b6f47bd-0390-9b1e-ffff504f94a03d3e/Every year test/1/0/4/1")
             }
     }
 
diff --git a/src/test/kotlin/calendar/CalEntryPeriodTest.kt b/src/test/kotlin/calendar/CalEntryPeriodTest.kt
index e7b25b5..09ed88e 100644
--- a/src/test/kotlin/calendar/CalEntryPeriodTest.kt
+++ b/src/test/kotlin/calendar/CalEntryPeriodTest.kt
@@ -25,6 +25,7 @@ class CalEntryPeriodTest {
                 get { endMonth }.isEqualTo(8)
                 get { endDay }.isEqualTo(4)
                 get { createEntryCommand().command }.isEqualTo("jdev/sps/calendarcreateentry/Period test/1/3/2024/8/3/2024/8/4")
+                get { updateEntryCommand(this.uuid).command }.isEqualTo("jdev/sps/calendarupdateentry/1b6f480b-0393-9b59-ffff504f94a03d3e/Period test/1/3/2024/8/3/2024/8/4")
             }
     }
 
diff --git a/src/test/kotlin/calendar/CalEntryPeriodYearlyTest.kt b/src/test/kotlin/calendar/CalEntryPeriodYearlyTest.kt
index 2dddef7..05993e1 100644
--- a/src/test/kotlin/calendar/CalEntryPeriodYearlyTest.kt
+++ b/src/test/kotlin/calendar/CalEntryPeriodYearlyTest.kt
@@ -23,6 +23,7 @@ class CalEntryPeriodYearlyTest {
                 get { endMonth }.isEqualTo(7)
                 get { endDay }.isEqualTo(6)
                 get { createEntryCommand().command }.isEqualTo("jdev/sps/calendarcreateentry/Period every year test/1/4/7/1/7/6")
+                get { updateEntryCommand(this.uuid).command }.isEqualTo("jdev/sps/calendarupdateentry/1b6f49be-025c-9ba0-ffff504f94a03d3e/Period every year test/1/4/7/1/7/6")
             }
     }
 
diff --git a/src/test/kotlin/calendar/CalEntrySingleDayTest.kt b/src/test/kotlin/calendar/CalEntrySingleDayTest.kt
index 9934654..42475b1 100644
--- a/src/test/kotlin/calendar/CalEntrySingleDayTest.kt
+++ b/src/test/kotlin/calendar/CalEntrySingleDayTest.kt
@@ -22,6 +22,7 @@ class CalEntrySingleDayTest {
                 get { startMonth }.isEqualTo(8)
                 get { startDay }.isEqualTo(3)
                 get { createEntryCommand().command }.isEqualTo("jdev/sps/calendarcreateentry/Single day test/1/2/2024/8/3")
+                get { updateEntryCommand(this.uuid).command }.isEqualTo("jdev/sps/calendarupdateentry/1b6f47f0-03b0-9b3d-ffff504f94a03d3e/Single day test/1/2/2024/8/3")
             }
     }