diff --git a/Corona-Warn-App/src/main/java/de/rki/coronawarnapp/bugreporting/debuglog/internal/LogSnapshotter.kt b/Corona-Warn-App/src/main/java/de/rki/coronawarnapp/bugreporting/debuglog/internal/LogSnapshotter.kt
index fee05ee7047486d5abeb73265adfac940e12194d..cbbd0e13e69cce358e844b948e19b2cbdef41aa1 100644
--- a/Corona-Warn-App/src/main/java/de/rki/coronawarnapp/bugreporting/debuglog/internal/LogSnapshotter.kt
+++ b/Corona-Warn-App/src/main/java/de/rki/coronawarnapp/bugreporting/debuglog/internal/LogSnapshotter.kt
@@ -34,7 +34,8 @@ class LogSnapshotter @Inject constructor(
         }
 
         val now = timeStamper.nowUTC.toUserTimeZone()
-        val formatter = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss.SSS")
+        // Avoid ":" in filename since it is a reserved character in Microsoft Windows
+        val formatter = DateTimeFormat.forPattern("yyyy-MM-dd HH_mm_ss.SSS")
         val formattedFileName = "CWA Log ${now.toString(formatter)}"
         if (!snapshotDir.exists() && snapshotDir.mkdirs()) {
             Timber.tag(TAG).v("Created %s", snapshotDir)
diff --git a/Corona-Warn-App/src/test/java/de/rki/coronawarnapp/bugreporting/debuglog/internal/LogSnapshotterTest.kt b/Corona-Warn-App/src/test/java/de/rki/coronawarnapp/bugreporting/debuglog/internal/LogSnapshotterTest.kt
index b4ccfd775f08b740cb3f13e00e4ee8e1b7c3384f..0bba493b4fee073d7150fd8fa0bd294693a80f55 100644
--- a/Corona-Warn-App/src/test/java/de/rki/coronawarnapp/bugreporting/debuglog/internal/LogSnapshotterTest.kt
+++ b/Corona-Warn-App/src/test/java/de/rki/coronawarnapp/bugreporting/debuglog/internal/LogSnapshotterTest.kt
@@ -2,12 +2,13 @@ package de.rki.coronawarnapp.bugreporting.debuglog.internal
 
 import android.content.Context
 import de.rki.coronawarnapp.bugreporting.debuglog.DebugLogger
+import de.rki.coronawarnapp.util.TimeAndDateExtensions.toUserTimeZone
 import de.rki.coronawarnapp.util.TimeStamper
 import io.kotest.matchers.shouldBe
 import io.mockk.MockKAnnotations
 import io.mockk.every
 import io.mockk.impl.annotations.MockK
-import org.joda.time.Instant
+import org.joda.time.DateTime
 import org.junit.jupiter.api.AfterEach
 import org.junit.jupiter.api.BeforeEach
 import org.junit.jupiter.api.Test
@@ -26,7 +27,7 @@ class LogSnapshotterTest : BaseIOTest() {
     private val runningLogFake = File(testDir, "running.log")
 
     private val snapshotDir = File(cacheDir, "debuglog_snapshots")
-    private val expectedSnapshot = File(snapshotDir, "CWA Log 1970-01-01 00:00:00.000.zip")
+    private val expectedSnapshot = File(snapshotDir, "CWA Log 1970-01-01 00_00_00.000.zip")
 
     @BeforeEach
     fun setup() {
@@ -38,7 +39,7 @@ class LogSnapshotterTest : BaseIOTest() {
         testDir.exists() shouldBe true
 
         every { debugLogger.runningLog } returns runningLogFake
-        every { timeStamper.nowUTC } returns Instant.EPOCH
+        every { timeStamper.nowUTC.toUserTimeZone() } returns DateTime.parse("1970-01-01T00:00:00.000Z")
 
         runningLogFake.parentFile!!.mkdirs()
         runningLogFake.writeText("1 Doge = 1 Doge")