diff --git a/package.json b/package.json
index 4d622b82..27464022 100644
--- a/package.json
+++ b/package.json
@@ -59,7 +59,7 @@
   "dependencies": {
     "@azure/cosmos": "^3.11.5",
     "@pagopa/io-functions-commons": "^20.6.6",
-    "@pagopa/ts-commons": "^9.4.1",
+    "@pagopa/ts-commons": "^9.6.0",
     "applicationinsights": "^1.7.4",
     "azure-storage": "^2.10.4",
     "cors": "^2.8.4",
diff --git a/utils/config.ts b/utils/config.ts
index f8b000d7..5fb9e5f1 100644
--- a/utils/config.ts
+++ b/utils/config.ts
@@ -8,10 +8,13 @@
 import { ServiceId } from "@pagopa/io-functions-commons/dist/generated/definitions/ServiceId";
 import { MailerConfig } from "@pagopa/io-functions-commons/dist/src/mailer";
 import { fromNullable } from "fp-ts/lib/Option";
+import { fromNullable as fromNullableE } from "fp-ts/lib/Either";
 import * as t from "io-ts";
 import { readableReport } from "italia-ts-commons/lib/reporters";
 import { NonEmptyString } from "italia-ts-commons/lib/strings";
-import { UTCISODateFromString } from "@pagopa/ts-commons/lib/dates";
+import { DateFromTimestamp } from "@pagopa/ts-commons/lib/dates";
+import { NumberFromString } from "@pagopa/ts-commons/lib/numbers";
+import { identity } from "fp-ts/lib/function";
 import { CommaSeparatedListOf } from "./comma-separated-list";
 
 // global app configuration
@@ -34,7 +37,7 @@ export const IConfig = t.intersection([
     IO_FUNCTIONS_ADMIN_BASE_URL: NonEmptyString,
 
     MESSAGE_CONTAINER_NAME: NonEmptyString,
-    OPT_OUT_EMAIL_SWITCH_DATE: UTCISODateFromString,
+    OPT_OUT_EMAIL_SWITCH_DATE: DateFromTimestamp,
 
     QueueStorageConnection: NonEmptyString,
 
@@ -53,7 +56,7 @@ export const IConfig = t.intersection([
   MailerConfig
 ]);
 
-const DEFAULT_OPT_OUT_EMAIL_SWITCH_DATE = "1970-01-01T00:00:00Z";
+const DEFAULT_OPT_OUT_EMAIL_SWITCH_DATE = 1625781600000;
 
 // No need to re-evaluate this object for each call
 const errorOrConfig: t.Validation<IConfig> = IConfig.decode({
@@ -69,9 +72,15 @@ const errorOrConfig: t.Validation<IConfig> = IConfig.decode({
   )
     .map(_ => _.toLowerCase() === "true")
     .getOrElse(false),
-  OPT_OUT_EMAIL_SWITCH_DATE: fromNullable(
+  OPT_OUT_EMAIL_SWITCH_DATE: fromNullableE(DEFAULT_OPT_OUT_EMAIL_SWITCH_DATE)(
     process.env.OPT_OUT_EMAIL_SWITCH_DATE
-  ).getOrElse(DEFAULT_OPT_OUT_EMAIL_SWITCH_DATE),
+  )
+    .chain(_ =>
+      NumberFromString.decode(_).mapLeft(
+        () => DEFAULT_OPT_OUT_EMAIL_SWITCH_DATE
+      )
+    )
+    .fold(identity, identity),
   isProduction: process.env.NODE_ENV === "production"
 });
 
diff --git a/yarn.lock b/yarn.lock
index 10099754..00c0ad8e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -669,24 +669,24 @@
     node-fetch "^2.6.0"
     validator "^10.1.0"
 
-"@pagopa/ts-commons@^9.4.1":
-  version "9.4.1"
-  resolved "https://registry.yarnpkg.com/@pagopa/ts-commons/-/ts-commons-9.4.1.tgz#cc2c1c08c84fb6fa55a99c506227b8c2dcc69c01"
-  integrity sha512-wA/eInP9l0vPovR4+50vpVxHdUr/el0xUrJ0LoRJv6qAErS9NzGIDwyg4ZjW6SHxDGzN4PpIFSb0QFki27wswg==
+"@pagopa/ts-commons@^9.5.1":
+  version "9.5.1"
+  resolved "https://registry.yarnpkg.com/@pagopa/ts-commons/-/ts-commons-9.5.1.tgz#a1285589265560a1a96b4d389da2e37f9209ec58"
+  integrity sha512-Eqozj079y/oyLZwh6I/WBWsUKJ6rFOj5wGTXaYmVffxFHWXstQiSqw5S6cFAKK5/LA9lL9ro+zk3+lUKi+/Fow==
   dependencies:
     abort-controller "^3.0.0"
-    agentkeepalive "^4.1.2"
-    applicationinsights "^1.7.4"
+    agentkeepalive "^4.1.4"
+    applicationinsights "^1.8.10"
     fp-ts "1.17.4"
     io-ts "1.8.5"
-    json-set-map "^1.0.2"
+    json-set-map "^1.1.2"
     node-fetch "^2.6.0"
     validator "^10.1.0"
 
-"@pagopa/ts-commons@^9.5.1":
-  version "9.5.1"
-  resolved "https://registry.yarnpkg.com/@pagopa/ts-commons/-/ts-commons-9.5.1.tgz#a1285589265560a1a96b4d389da2e37f9209ec58"
-  integrity sha512-Eqozj079y/oyLZwh6I/WBWsUKJ6rFOj5wGTXaYmVffxFHWXstQiSqw5S6cFAKK5/LA9lL9ro+zk3+lUKi+/Fow==
+"@pagopa/ts-commons@^9.6.0":
+  version "9.6.0"
+  resolved "https://registry.yarnpkg.com/@pagopa/ts-commons/-/ts-commons-9.6.0.tgz#dbc837e8afa0aa66ab174d49757321a9fe18e416"
+  integrity sha512-GrXz6qFtBeRPS7reVxLEze6OvHUNMlCp4Ksbqwijl8xdkXD9ETCgU+9nKjGSPS6fOz2pUIOuIcts72HX7wlGmA==
   dependencies:
     abort-controller "^3.0.0"
     agentkeepalive "^4.1.4"