diff --git a/salt/modules/x509.py b/salt/modules/x509.py
index 5a40eff67a9..59cf6d3403f 100644
--- a/salt/modules/x509.py
+++ b/salt/modules/x509.py
@@ -1537,7 +1537,7 @@ def create_certificate(path=None, text=False, overwrite=True, ca_server=None, **
     if "not_before" in kwargs:
         try:
             time = datetime.datetime.strptime(kwargs["not_before"], fmt)
-        except:
+        except ValueError:
             raise salt.exceptions.SaltInvocationError(
                 "not_before: {} is not in required format {}".format(
                     kwargs["not_before"], fmt
@@ -1555,7 +1555,7 @@ def create_certificate(path=None, text=False, overwrite=True, ca_server=None, **
     if "not_after" in kwargs:
         try:
             time = datetime.datetime.strptime(kwargs["not_after"], fmt)
-        except:
+        except ValueError:
             raise salt.exceptions.SaltInvocationError(
                 "not_after: {} is not in required format {}".format(
                     kwargs["not_after"], fmt