diff --git a/chrome/content/zotero/dateOverrides.js b/chrome/content/zotero/dateOverrides.js
new file mode 100644
index 0000000000..54e6ad6cdf
--- /dev/null
+++ b/chrome/content/zotero/dateOverrides.js
@@ -0,0 +1,18 @@
+/* eslint-disable no-extend-native */
+const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
+
+let originalToLocaleString = Date.prototype.toLocaleString;
+Date.prototype.toLocaleString = function (locales, options) {
+	if (locales === undefined || (Array.isArray(locales) && !locales.length)) {
+		locales = Services.locale.requestedLocales;
+	}
+	return originalToLocaleString.call(this, locales, options);
+};
+
+let originalToLocaleDateString = Date.prototype.toLocaleDateString;
+Date.prototype.toLocaleDateString = function (locales, options) {
+	if (locales === undefined || (Array.isArray(locales) && !locales.length)) {
+		locales = Services.locale.requestedLocales;
+	}
+	return originalToLocaleDateString.call(this, locales, options);
+};
diff --git a/chrome/content/zotero/zotero.mjs b/chrome/content/zotero/zotero.mjs
index 43063d9657..bc547cc7fe 100644
--- a/chrome/content/zotero/zotero.mjs
+++ b/chrome/content/zotero/zotero.mjs
@@ -221,6 +221,8 @@ XPCOMUtils.defineLazyModuleGetters(ZoteroContext.prototype, {
  * components may not have yet been initialized.
  */
 function makeZoteroContext() {
+	var subscriptLoader = Cc["@mozilla.org/moz/jssubscript-loader;1"].getService(Ci.mozIJSSubScriptLoader);
+	
 	if(zContext) {
 		// Swap out old zContext
 		var oldzContext = zContext;
@@ -232,10 +234,11 @@ function makeZoteroContext() {
 	} else {
 		zContext = new ZoteroContext();
 		zContext.Zotero = function() {};
+
+		// Override Date prototype to follow Zotero configured locale #3880
+		subscriptLoader.loadSubScript("chrome://zotero/content/dateOverrides.js");
 	}
 	
-	var subscriptLoader = Cc["@mozilla.org/moz/jssubscript-loader;1"].getService(Ci.mozIJSSubScriptLoader);
-	
 	// Load zotero.js first
 	subscriptLoader.loadSubScript("chrome://zotero/content/xpcom/" + xpcomFilesAll[0] + ".js", zContext, 'utf-8');