diff --git a/app/src/androidTest/java/org/tasks/opentasks/OpenTasksDueDateTests.kt b/app/src/androidTest/java/org/tasks/opentasks/OpenTasksDueDateTests.kt
index 75e3a3615..d3a3f25d1 100644
--- a/app/src/androidTest/java/org/tasks/opentasks/OpenTasksDueDateTests.kt
+++ b/app/src/androidTest/java/org/tasks/opentasks/OpenTasksDueDateTests.kt
@@ -1,6 +1,7 @@
 package org.tasks.opentasks
 
 import com.natpryce.makeiteasy.MakeItEasy.with
+import com.todoroo.astrid.data.Task
 import dagger.hilt.android.testing.HiltAndroidTest
 import dagger.hilt.android.testing.UninstallModules
 import kotlinx.coroutines.runBlocking
@@ -51,7 +52,7 @@ class OpenTasksDueDateTests : OpenTasksTest() {
 
         assertEquals(
                 1612137600000,
-                openTaskDao.getTask(listId.toLong(), "1234")?.task?.due?.date?.time
+                openTaskDao.getTask(listId, "1234")?.task?.due?.date?.time
         )
     }
 
@@ -87,7 +88,7 @@ class OpenTasksDueDateTests : OpenTasksTest() {
 
         assertEquals(
                 1612137600000,
-                openTaskDao.getTask(listId.toLong(), "1234")?.task?.due?.date?.time
+                openTaskDao.getTask(listId, "1234")?.task?.due?.date?.time
         )
     }
 
@@ -123,10 +124,60 @@ class OpenTasksDueDateTests : OpenTasksTest() {
 
         assertEquals(
                 1612137600000,
-                openTaskDao.getTask(listId.toLong(), "1234")?.task?.due?.date?.time
+                openTaskDao.getTask(listId, "1234")?.task?.due?.date?.time
         )
     }
 
+    @Test
+    fun startTimeEqualsDueTime() = runBlocking {
+        val (listId, list) = openTaskDao.insertList()
+        val task = newTask(
+                with(TaskMaker.HIDE_TYPE, Task.HIDE_UNTIL_DUE_TIME),
+                with(TaskMaker.DUE_TIME, DateTime(2021, 2, 1, 16, 0))
+        )
+        taskDao.createNew(task)
+        caldavDao.insert(newCaldavTask(
+                with(CaldavTaskMaker.CALENDAR, list.uuid),
+                with(CaldavTaskMaker.REMOTE_ID, "1234"),
+                with(CaldavTaskMaker.TASK, task.id)
+        ))
+
+        synchronizer.sync()
+
+        assertEquals(
+                1612216800000,
+                openTaskDao.getTask(listId, "1234")?.task?.dtStart?.date?.time
+        )
+        assertEquals(
+                1612216801000,
+                openTaskDao.getTask(listId, "1234")?.task?.due?.date?.time
+        )
+    }
+
+    @Test
+    fun startTimeEqualDueTime() = runBlocking {
+        val (_, list) = withVtodo(START_TIME_DUE_TIME)
+
+        synchronizer.sync()
+
+        val caldavTask = caldavDao.getTaskByRemoteId(list.uuid!!, "2009955511573185442")
+        val task = taskDao.fetch(caldavTask!!.task)!!
+        assertEquals(DateTime(2021, 2, 4, 8, 0, 1, 0).millis, task.dueDate)
+        assertEquals(task.dueDate, task.hideUntil)
+    }
+
+    @Test
+    fun startTimeEqualDueTimeNoOffset() = runBlocking {
+        val (_, list) = withVtodo(START_TIME_DUE_TIME_NO_OFFSET)
+
+        synchronizer.sync()
+
+        val caldavTask = caldavDao.getTaskByRemoteId(list.uuid!!, "2009955511573185442")
+        val task = taskDao.fetch(caldavTask!!.task)!!
+        assertEquals(DateTime(2021, 2, 4, 8, 0, 1, 0).millis, task.dueDate)
+        assertEquals(task.dueDate, task.hideUntil)
+    }
+
     companion object {
         private val BERLIN = TimeZone.getTimeZone("Europe/Berlin")
         private val LONDON = TimeZone.getTimeZone("Europe/London")
@@ -146,5 +197,39 @@ class OpenTasksDueDateTests : OpenTasksTest() {
             END:VTODO
             END:VCALENDAR
         """.trimIndent()
+
+        private val START_TIME_DUE_TIME = """
+            BEGIN:VCALENDAR
+            VERSION:2.0
+            PRODID:+//IDN tasks.org//android-110305//EN
+            BEGIN:VTODO
+            DTSTAMP:20210203T164753Z
+            UID:2009955511573185442
+            CREATED:20210203T164728Z
+            LAST-MODIFIED:20210203T164750Z
+            SUMMARY:Start time
+            X-APPLE-SORT-ORDER:-5
+            DUE;TZID=America/Chicago:20210204T080001
+            DTSTART;TZID=America/Chicago:20210204T080000
+            END:VTODO
+            END:VCALENDAR
+        """.trimIndent()
+
+        private val START_TIME_DUE_TIME_NO_OFFSET = """
+            BEGIN:VCALENDAR
+            VERSION:2.0
+            PRODID:+//IDN tasks.org//android-110305//EN
+            BEGIN:VTODO
+            DTSTAMP:20210203T164753Z
+            UID:2009955511573185442
+            CREATED:20210203T164728Z
+            LAST-MODIFIED:20210203T164750Z
+            SUMMARY:Start time
+            X-APPLE-SORT-ORDER:-5
+            DUE;TZID=America/Chicago:20210204T080000
+            DTSTART;TZID=America/Chicago:20210204T080000
+            END:VTODO
+            END:VCALENDAR
+        """.trimIndent()
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/org/tasks/caldav/iCalendar.kt b/app/src/main/java/org/tasks/caldav/iCalendar.kt
index 40c5f3ba2..0a1ce00c1 100644
--- a/app/src/main/java/org/tasks/caldav/iCalendar.kt
+++ b/app/src/main/java/org/tasks/caldav/iCalendar.kt
@@ -30,6 +30,7 @@ import org.tasks.location.GeofenceApi
 import org.tasks.preferences.Preferences
 import org.tasks.time.DateTime.UTC
 import org.tasks.time.DateTimeUtils.startOfDay
+import org.tasks.time.DateTimeUtils.startOfMinute
 import timber.log.Timber
 import java.io.ByteArrayOutputStream
 import java.io.StringReader
@@ -305,7 +306,11 @@ class iCalendar @Inject constructor(
             description = task.notes
             val allDay = !task.hasDueTime() && !task.hasStartTime()
             val dueDate = if (task.hasDueTime()) task.dueDate else task.dueDate.startOfDay()
-            var startDate = if (task.hasStartTime()) task.hideUntil else task.hideUntil.startOfDay()
+            var startDate = if (task.hasStartTime()) {
+                task.hideUntil.startOfMinute()
+            } else {
+                task.hideUntil.startOfDay()
+            }
             due = if (dueDate > 0) {
                 startDate = min(dueDate, startDate)
                 Due(if (allDay) getDate(dueDate) else getDateTime(dueDate))
diff --git a/app/src/main/java/org/tasks/time/DateTimeUtils.kt b/app/src/main/java/org/tasks/time/DateTimeUtils.kt
index 648a2f219..9f5f72237 100644
--- a/app/src/main/java/org/tasks/time/DateTimeUtils.kt
+++ b/app/src/main/java/org/tasks/time/DateTimeUtils.kt
@@ -37,5 +37,7 @@ object DateTimeUtils {
     @JvmStatic
     fun Long.startOfDay(): Long = if (this > 0) toDateTime().startOfDay().millis else 0
 
+    fun Long.startOfMinute(): Long = if (this > 0) toDateTime().startOfMinute().millis else 0
+
     fun Long.millisOfDay(): Int = if (this > 0) toDateTime().millisOfDay else 0
 }
\ No newline at end of file