diff --git a/rules/windows/wmi_event/sysmon_wmi_susp_scripting.yml b/rules/windows/wmi_event/sysmon_wmi_susp_scripting.yml
index cd3dcfc43..005ea8e98 100644
--- a/rules/windows/wmi_event/sysmon_wmi_susp_scripting.yml
+++ b/rules/windows/wmi_event/sysmon_wmi_susp_scripting.yml
@@ -41,4 +41,4 @@ falsepositives:
 level: high
 tags:
     - attack.execution
-    - attack.t1059.005
\ No newline at end of file
+    - attack.t1059.005
diff --git a/tools/sigma/backends/fortisiem.py b/tools/sigma/backends/fortisiem.py
index cd3dd44fe..da8cb0882 100644
--- a/tools/sigma/backends/fortisiem.py
+++ b/tools/sigma/backends/fortisiem.py
@@ -743,8 +743,7 @@ class FortisemBackend(RulenameCommentMixin, BaseBackend, QuoteCharMixin):
 
         res,errMsg = self.generateEvtConstrForOneLogsource(sigmaparser);
         if errMsg is not None:
-            print(self.ymlFileName)
-            print(errMsg)
+            print("%s, %s" % (self.ymlFileName, errMsg))
             return None
 
         result.add(res)
diff --git a/tools/sigma/sigmac.py b/tools/sigma/sigmac.py
index b27bc57bc..d1f1bc3aa 100755
--- a/tools/sigma/sigmac.py
+++ b/tools/sigma/sigmac.py
@@ -35,6 +35,8 @@ from sigma.backends.exceptions import BackendError, NotSupportedError, PartialMa
 from sigma.parser.modifiers import modifiers
 import codecs
 import copy
+import time
+import datetime
 
 sys.stdout = codecs.getwriter('utf-8')(sys.stdout.detach())
 
@@ -111,6 +113,7 @@ def set_argparser():
             """)
     argparser.add_argument("--target", "-t", choices=backends.getBackendDict().keys(), help="Output target format")
     argparser.add_argument("--lists", "-l", action="store_true", help="List available output target formats and configurations")
+    argparser.add_argument("--lists-files-after-date", "-L",help="List yml files  which is modified/created after the date (Example of the date: 2022/02/01).")
     argparser.add_argument("--config", "-c", action="append", help="Configurations with field name and index mapping for target environment. Multiple configurations are merged into one. Last config is authoritative in case of conflicts.")
     argparser.add_argument("--output", "-o", default=None, help="Output file or filename prefix (if end with a '_','/' or '\\')")
     argparser.add_argument("--output-fields", "-of", help="""Enhance your output with additional fields from the Sigma rule (not only the converted rule itself). 
@@ -148,6 +151,32 @@ def list_modifiers(modifiers):
     for modifier_id, modifier in modifiers.items():
         print("{:>10} : {}".format(modifier_id, modifier.__doc__))
 
+def get_fileName_after_date(inputs, recurse, date):
+    #date: 2021/05/06
+    #modified: 2021/11/30
+    dateTime = time.mktime(datetime.datetime.strptime(date, "%Y/%m/%d").timetuple())
+    for sigmafile in get_inputs(inputs, recurse):
+        f = sigmafile.open(encoding='utf-8')
+        yamls = yaml.safe_load_all(f)
+        datestr = None
+        modifiedstr = None
+        for data in yamls:
+            modifiedstr = data.get("modified", None)
+            datestr = data.get("date", None)
+            if not modifiedstr and not datestr:
+                continue;
+
+        if not modifiedstr and not datestr:
+            print("%s, No date" % sigmafile)
+            continue
+
+        if not modifiedstr:
+            modifiedstr = datestr
+
+        modified = time.mktime(datetime.datetime.strptime(modifiedstr, "%Y/%m/%d").timetuple())
+        if modified > dateTime:
+            print("%s, Updated" % sigmafile)
+
 def main():
     argparser = set_argparser()
     cmdargs = argparser.parse_args()
@@ -175,6 +204,10 @@ def main():
         argparser.print_usage()
         sys.exit(0)
 
+    if cmdargs.lists_files_after_date is not None:
+        get_fileName_after_date(cmdargs.inputs, cmdargs.recurse, cmdargs.lists_files_after_date)
+        sys.exit(0)
+
     if cmdargs.target is None:
         print("No target selected, select one with -t/--target")
         argparser.print_usage()