diff --git a/src/main/kotlin/uk/gov/communities/prsdb/webapp/constants/InvitationLifetimeConstants.kt b/src/main/kotlin/uk/gov/communities/prsdb/webapp/constants/InvitationLifetimeConstants.kt
index c6a0469de7..a0be34b51d 100644
--- a/src/main/kotlin/uk/gov/communities/prsdb/webapp/constants/InvitationLifetimeConstants.kt
+++ b/src/main/kotlin/uk/gov/communities/prsdb/webapp/constants/InvitationLifetimeConstants.kt
@@ -1,4 +1,4 @@
 package uk.gov.communities.prsdb.webapp.constants
 
 const val LOCAL_COUNCIL_INVITATION_LIFETIME_IN_HOURS: Int = 48
-const val JOINT_LANDLORD_INVITATION_LIFETIME_IN_HOURS: Int = 672 // 28 days
+const val JOINT_LANDLORD_INVITATION_LIFETIME_IN_DAYS = 28
diff --git a/src/main/kotlin/uk/gov/communities/prsdb/webapp/database/entity/JointLandlordInvitation.kt b/src/main/kotlin/uk/gov/communities/prsdb/webapp/database/entity/JointLandlordInvitation.kt
index 3c9376ce79..a8004502d9 100644
--- a/src/main/kotlin/uk/gov/communities/prsdb/webapp/database/entity/JointLandlordInvitation.kt
+++ b/src/main/kotlin/uk/gov/communities/prsdb/webapp/database/entity/JointLandlordInvitation.kt
@@ -7,6 +7,12 @@ import jakarta.persistence.GenerationType
 import jakarta.persistence.Id
 import jakarta.persistence.JoinColumn
 import jakarta.persistence.ManyToOne
+import kotlinx.datetime.DatePeriod
+import kotlinx.datetime.LocalDate
+import kotlinx.datetime.plus
+import kotlinx.datetime.toKotlinInstant
+import uk.gov.communities.prsdb.webapp.constants.JOINT_LANDLORD_INVITATION_LIFETIME_IN_DAYS
+import uk.gov.communities.prsdb.webapp.helpers.DateTimeHelper
 import java.util.UUID
 
 @Entity
@@ -45,6 +51,15 @@ class JointLandlordInvitation(
         this.invitingLandlord = invitingLandlord
     }
 
+    val expiresOnDate: LocalDate
+        get() =
+            DateTimeHelper
+                .getDateInUK(createdDate.toKotlinInstant())
+                .plus(DatePeriod(days = JOINT_LANDLORD_INVITATION_LIFETIME_IN_DAYS))
+
+    val isExpired: Boolean
+        get() = DateTimeHelper().getCurrentDateInUK() > expiresOnDate
+
     constructor(
         id: Long,
         token: UUID,
diff --git a/src/test/kotlin/uk/gov/communities/prsdb/webapp/database/entity/JointLandlordInvitationTests.kt b/src/test/kotlin/uk/gov/communities/prsdb/webapp/database/entity/JointLandlordInvitationTests.kt
new file mode 100644
index 0000000000..bc15372639
--- /dev/null
+++ b/src/test/kotlin/uk/gov/communities/prsdb/webapp/database/entity/JointLandlordInvitationTests.kt
@@ -0,0 +1,35 @@
+package uk.gov.communities.prsdb.webapp.database.entity
+
+import org.junit.jupiter.api.Assertions.assertFalse
+import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.Test
+import uk.gov.communities.prsdb.webapp.constants.JOINT_LANDLORD_INVITATION_LIFETIME_IN_DAYS
+import uk.gov.communities.prsdb.webapp.testHelpers.mockObjects.MockJointLandlordData
+import java.time.Instant
+import java.time.temporal.ChronoUnit
+
+class JointLandlordInvitationTests {
+    @Test
+    fun `isExpired returns false when the current day is earlier than the expiry date`() {
+        val createdDate = Instant.now().minus((JOINT_LANDLORD_INVITATION_LIFETIME_IN_DAYS - 1).toLong(), ChronoUnit.DAYS)
+        val invitation = MockJointLandlordData.createJointLandlordInvitation(createdDate = createdDate)
+
+        assertFalse(invitation.isExpired)
+    }
+
+    @Test
+    fun `isExpired returns false when the current day equals the expiry date`() {
+        val createdDate = Instant.now().minus(JOINT_LANDLORD_INVITATION_LIFETIME_IN_DAYS.toLong(), ChronoUnit.DAYS)
+        val invitation = MockJointLandlordData.createJointLandlordInvitation(createdDate = createdDate)
+
+        assertFalse(invitation.isExpired)
+    }
+
+    @Test
+    fun `isExpired returns true when the current day is later than the expiry date`() {
+        val createdDate = Instant.now().minus((JOINT_LANDLORD_INVITATION_LIFETIME_IN_DAYS + 1).toLong(), ChronoUnit.DAYS)
+        val invitation = MockJointLandlordData.createJointLandlordInvitation(createdDate = createdDate)
+
+        assertTrue(invitation.isExpired)
+    }
+}