diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/Common.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/Common.kt
index 8eaef26cfb..ff8adabedd 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/Common.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/Common.kt
@@ -163,6 +163,7 @@ const val ipAddressField = "ip_address"
 const val linkedChatIdField = "linked_chat_id"
 const val horizontalAccuracyField = "horizontal_accuracy"
 const val revokeMessagesField = "revoke_messages"
+const val messageAutoDeleteTimeField = "message_auto_delete_time"
 
 const val requestContactField = "request_contact"
 const val requestLocationField = "request_location"
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/ChatEvents/MessageAutoDeleteTimerChanged.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/ChatEvents/MessageAutoDeleteTimerChanged.kt
index e54c53fdd3..adbce62869 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/ChatEvents/MessageAutoDeleteTimerChanged.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/ChatEvents/MessageAutoDeleteTimerChanged.kt
@@ -1,10 +1,23 @@
 package dev.inmo.tgbotapi.types.message.ChatEvents
 
+import com.soywiz.klock.hours
 import dev.inmo.tgbotapi.types.Seconds
 import dev.inmo.tgbotapi.types.message.ChatEvents.abstracts.*
+import dev.inmo.tgbotapi.types.messageAutoDeleteTimeField
+import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 
+private val seconds24Hours: Seconds = 60 * 60 * 24
+private val seconds7Days: Seconds = seconds24Hours * 7
+
 @Serializable
 data class MessageAutoDeleteTimerChanged(
+    @SerialName(messageAutoDeleteTimeField)
     val newAutoDeleteTime: Seconds // TODO:: check that it is seconds
 ) : ChannelEvent, GroupEvent, SupergroupEvent
+
+val MessageAutoDeleteTimerChanged.is24Hours
+    get() = newAutoDeleteTime == seconds24Hours
+
+val MessageAutoDeleteTimerChanged.is7Days
+    get() = newAutoDeleteTime == seconds7Days