diff --git a/sdk/core/src/main/java/com/klaviyo/core/config/SystemClock.kt b/sdk/core/src/main/java/com/klaviyo/core/config/SystemClock.kt
index ff2d8fecd..855ffb9c7 100644
--- a/sdk/core/src/main/java/com/klaviyo/core/config/SystemClock.kt
+++ b/sdk/core/src/main/java/com/klaviyo/core/config/SystemClock.kt
@@ -3,14 +3,16 @@ package com.klaviyo.core.config
 import android.annotation.SuppressLint
 import java.text.SimpleDateFormat
 import java.util.Date
+import java.util.Locale
 import java.util.TimeZone
 import java.util.Timer
 import kotlin.concurrent.schedule
 
 internal object SystemClock : Clock {
 
+    // Explicitly set Locale.ENGLISH to ensure consistent formatting
     @SuppressLint("SimpleDateFormat")
-    private val format = SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ").apply {
+    private val format = SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ", Locale.ENGLISH).apply {
         timeZone = TimeZone.getTimeZone("UTC")
     }