diff --git a/README.md b/README.md
index a42e488..69bbc83 100644
--- a/README.md
+++ b/README.md
@@ -71,6 +71,7 @@ if __name__ == '__main__':
             'https://mytestsite.com/photos/',
             'https://mytestsite.com/git/',
         ],
+        use_lastmodified=False,
         headers={'User-Agent': 'Crawler'},
         # TZ offset in hours
         timezone_offset=3,
diff --git a/pysitemap/__init__.py b/pysitemap/__init__.py
index cc47875..196feab 100644
--- a/pysitemap/__init__.py
+++ b/pysitemap/__init__.py
@@ -6,8 +6,8 @@ from pysitemap.base_crawler import Crawler
 def crawler(
     root_url, out_file, out_format='xml',
     maxtasks=10, exclude_urls=[], exclude_imgs=[], image_root_urls=[],
-    verifyssl=True, findimages=True, images_this_domain=True, headers=None,
-    timezone_offset=0, changefreq=None, priorities=None):
+    use_lastmodified=True, verifyssl=True, findimages=True, images_this_domain=True,
+    headers=None, timezone_offset=0, changefreq=None, priorities=None):
     """
     run crowler
     :param root_url: Site root url
@@ -17,6 +17,7 @@ def crawler(
     :param exclude_urls: excludable url paths
     :param exclude_imgs: excludable img url paths
     :param image_root_urls: recognized image root urls on the domain
+    :param use_lastmodified: enable or disable timestamps for fetched urls?
     :param verifyssl: verify website certificate?
     :param findimages: Find images references?
     :param images_this_domain: Find images which refer to this domain only?
@@ -30,9 +31,9 @@ def crawler(
 
     c = Crawler(root_url, out_file=out_file, out_format=out_format,
                 maxtasks=maxtasks, exclude_urls=exclude_urls, exclude_imgs=exclude_imgs,
-                image_root_urls=image_root_urls, verifyssl=verifyssl, findimages=findimages,
-                images_this_domain=images_this_domain, headers=headers, timezone_offset=timezone_offset,
-                changefreq=changefreq, priorities=priorities)
+                image_root_urls=image_root_urls, use_lastmodified=use_lastmodified, verifyssl=verifyssl,
+                findimages=findimages, images_this_domain=images_this_domain, headers=headers,
+                timezone_offset=timezone_offset, changefreq=changefreq, priorities=priorities)
 
     loop.run_until_complete(c.run())
 
diff --git a/pysitemap/base_crawler.py b/pysitemap/base_crawler.py
index ceabea7..f2d3983 100644
--- a/pysitemap/base_crawler.py
+++ b/pysitemap/base_crawler.py
@@ -15,8 +15,9 @@ class Crawler:
     }
 
     def __init__(self, rooturl, out_file, out_format='xml', maxtasks=10, exclude_urls=[], exclude_imgs=[],
-                 image_root_urls=[], verifyssl=True, findimages=True, images_this_domain=True, headers=None, timezone_offset=0,
-                 changefreq=None, priorities=None, todo_queue_backend=set, done_backend=dict, done_images=list):
+                 image_root_urls=[], use_lastmodified=True, verifyssl=True, findimages=True, images_this_domain=True,
+                 headers=None, timezone_offset=0, changefreq=None, priorities=None, todo_queue_backend=set,
+                 done_backend=dict, done_images=list):
         """
         Crawler constructor
         :param rooturl: root url of site
@@ -33,6 +34,8 @@ class Crawler:
         :type exclude_imgs: list
         :param image_root_urls: recognized image root urls on the domain
         :type image_root_urls: list
+        :param use_lastmodified: enable or disable timestamps for fetched urls?
+        :type use_lastmodified: bool
         :param verifyssl: verify website certificate?
         :type verifyssl: bool
         :param findimages: Find images references?
@@ -49,6 +52,7 @@ class Crawler:
         self.rooturl = rooturl
         self.exclude_urls = exclude_urls
         self.exclude_imgs = exclude_imgs
+        self.use_lastmodified = use_lastmodified
         self.image_root_urls = image_root_urls
         self.findimages = findimages
         self.images_this_domain = images_this_domain
@@ -281,7 +285,8 @@ class Crawler:
                 data = (await resp.read()).decode('utf-8', 'replace')
                 urls = re.findall(r'(?i)href=["\']?([^\s"\'<>]+)', data)
 
-                lastmod = resp.headers.get('last-modified')
+                if self.use_lastmodified:
+                    lastmod = resp.headers.get('last-modified')
 
                 if self.findimages:
                     # Ref: https://support.google.com/webmasters/answer/178636?hl=en
diff --git a/run.py b/run.py
index e0a0aa1..0815fbd 100644
--- a/run.py
+++ b/run.py
@@ -30,6 +30,7 @@ if __name__ == '__main__':
             'https://mytestsite.com/photos/',
             'https://mytestsite.com/git/',
         ],
+        use_lastmodified=False,
         headers={'User-Agent': 'Crawler'},
         # TZ offset in hours
         timezone_offset=3,