Don't print that form link after the end of month.

src/pip/_internal/commands/install.py

@@ -21,6 +21,7 @@ from pip._internal.locations import distutils_scheme
 from pip._internal.operations.check import check_install_conflicts
 from pip._internal.req import install_given_reqs
 from pip._internal.req.req_tracker import get_requirement_tracker
+from pip._internal.utils.datetime import today_is_later_than
 from pip._internal.utils.deprecation import deprecated
 from pip._internal.utils.distutils_args import parse_distutils_args
 from pip._internal.utils.filesystem import test_writable_dir
@@ -557,7 +558,7 @@ class InstallCommand(RequirementCommand):
                 "your packages with the new resolver before it becomes the "
                 "default.\n"
             )
-        else:
+        elif not today_is_later_than(year=2020, month=7, day=31):
             # NOTE: trailing newlines here are intentional
             parts.append(
                 "Pip will install or upgrade your package(s) and its "

src/pip/_internal/utils/datetime.py

@@ -0,0 +1,12 @@
+"""For when pip wants to check the date or time.
+"""
+
+import datetime
+
+
+def today_is_later_than(year, month, day):
+    # type: (int, int, int) -> bool
+    today = datetime.date.today()
+    given = datetime.date(year, month, day)
+
+    return today > given