diff --git a/projects/scully-sitemap/README.md b/projects/scully-sitemap/README.md
index 92a6eb2..5caac7d 100644
--- a/projects/scully-sitemap/README.md
+++ b/projects/scully-sitemap/README.md
@@ -40,13 +40,15 @@ setPluginConfig(SitemapPlugin, {
     trailingSlash: false,
     changeFreq: 'monthly',
     priority: ['1.0', '0.9', '0.8', '0.7', '0.6', '0.5', '0.4', '0.3', '0.2', '0.1', '0.0'],
-    ignoredRoutes: ['/404'],
+    ignoredRoutes: ['/404', '/testing/.*'],
+    lastMod: new Date().toISOString(),
     routes: {
         '/products/:productId': {
             changeFreq: 'daily',
             priority: '0.9',
             sitemapFilename: 'sitemap-products.xml',
-            merge: true
+            merge: true,
+            lastMod: new Date().toISOString()
         },
     }
 });
diff --git a/projects/scully-sitemap/src/lib/index.ts b/projects/scully-sitemap/src/lib/index.ts
index 63a14fc..af5e494 100644
--- a/projects/scully-sitemap/src/lib/index.ts
+++ b/projects/scully-sitemap/src/lib/index.ts
@@ -48,7 +48,8 @@ const configForRoute = (config: SitemapConfig, route: HandledRoute) => {
           sitemapFilename: routeConfig.sitemapFilename || config.sitemapFilename,
           merge: routeConfig.merge || config.merge,
           changeFreq: routeConfig.changeFreq || config.changeFreq,
-          priority: routeConfig.priority || config.priority
+          priority: routeConfig.priority || config.priority,
+          lastMod: routeConfig.lastMod || config.lastMod
         };
       }
     }
@@ -60,7 +61,8 @@ const configForRoute = (config: SitemapConfig, route: HandledRoute) => {
     sitemapFilename: config.sitemapFilename,
     merge: config.merge,
     changeFreq: config.changeFreq,
-    priority: config.priority
+    priority: config.priority,
+    lastMod: config.lastMod
   };
 };
 
@@ -164,8 +166,14 @@ export const sitemapPlugin = async (routes?: HandledRoute[]): Promise<void> => {
   const maps = {};
 
   routes.forEach((route: HandledRoute) => {
-    if ( config.ignoredRoutes && config.ignoredRoutes.includes(route.route) ) {
-      return;
+    if ( config.ignoredRoutes ) {
+      const ignore = config.ignoredRoutes.reduce((prev, curr) => {
+        if (typeof curr === 'string') {
+          return prev || route.route === curr;
+        }
+        return prev || curr.test(route.route);
+      }, false);
+      if (ignore) return;
     }
     const routeConfig = configForRoute(config, route);
     const map = getMapForRoute(maps, routeConfig);
@@ -177,7 +185,7 @@ export const sitemapPlugin = async (routes?: HandledRoute[]): Promise<void> => {
     map[loc] = {
       loc,
       changefreq: routeConfig.changeFreq,
-      lastmod: today.toISOString(),
+      lastmod: routeConfig.lastMod ?? today.toISOString(),
       priority: priorityForLocation(route.route, routeConfig)
     };
   });
diff --git a/projects/scully-sitemap/src/lib/sitemap-config.ts b/projects/scully-sitemap/src/lib/sitemap-config.ts
index 075d1b4..0861568 100644
--- a/projects/scully-sitemap/src/lib/sitemap-config.ts
+++ b/projects/scully-sitemap/src/lib/sitemap-config.ts
@@ -24,6 +24,8 @@ export class SitemapRoute {
   /** would you like to append a trailing slash to the url */
   trailingSlash?: boolean;
 
+  /** Last modification datetime (YYYY-MM-DDTHH:mm:ss.sssZ = date.toISOString()) */
+  lastMod?: string;
 }
 
 /**
@@ -49,8 +51,11 @@ export class SitemapConfig {
   /** A list of priorities to set based on number of segments in the route */
   priority?: string | string[];
 
+  /** Last modification datetime (YYYY-MM-DDTHH:mm:ss.sssZ = date.toISOString()) */
+  lastMod?: string;
+
   /** A list of routes not to include in the sitemap */
-  ignoredRoutes?: string[];
+  ignoredRoutes?: (string | RegExp)[];
 
   /** If `true`, the plugin will not log status messages to the console. */
   suppressLog?: boolean;