diff --git a/.github/workflows/main-deploy.yml b/.github/workflows/main-deploy.yml
index fe96e9d..6ec749b 100644
--- a/.github/workflows/main-deploy.yml
+++ b/.github/workflows/main-deploy.yml
@@ -15,6 +15,7 @@ jobs:
     secrets:
       GH_DEPLOY_TOKEN: ${{ secrets.GH_DEPLOY_TOKEN }}
       NPM_ORG_OGS_GMBH_CI: ${{ secrets.NPM_ORG_OGS_GMBH_CI }}
+      MS_TEAMS_URL: ${{ secrets.MS_TEAMS_URL }}
     with:
       release_please_config_file: ".release-please/main-config.json"
       release_please_manifest_file: ".release-please/main-manifest.json"
diff --git a/.github/workflows/next-deploy.yml b/.github/workflows/next-deploy.yml
index 4feafbd..c684b96 100644
--- a/.github/workflows/next-deploy.yml
+++ b/.github/workflows/next-deploy.yml
@@ -15,6 +15,7 @@ jobs:
     secrets:
       GH_DEPLOY_TOKEN: ${{ secrets.GH_DEPLOY_TOKEN }}
       NPM_ORG_OGS_GMBH_CI: ${{ secrets.NPM_ORG_OGS_GMBH_CI }}
+      MS_TEAMS_URL: ${{ secrets.MS_TEAMS_URL }}
     with:
       release_please_config_file: ".release-please/next-config.json"
       release_please_manifest_file: ".release-please/next-manifest.json"
diff --git a/src/date/iso-date.ts b/src/date/iso-date.ts
index 1768831..d72cdad 100644
--- a/src/date/iso-date.ts
+++ b/src/date/iso-date.ts
@@ -1,4 +1,9 @@
-function toISOStringDate (this: Date): string {
+function toISOStringDate (this: Date, isLocal: boolean = false): string {
+  if (isLocal) {
+    return `${ this.getFullYear() }-${ (this.getMonth() + 1).toString().padStart(2, "0") }-${ this.getDate().toString()
+      .padStart(2, "0") }`;
+  }
+
   const ISO_TIME_SEPARATOR: string = "T";
 
   /* eslint-disable-next-line @tseslint/no-non-null-assertion */
@@ -13,3 +18,4 @@ Object.defineProperty(Date.prototype, "toISOStringDate", {
   configurable: false,
   enumerable: false
 });
+
diff --git a/src/public-api.ts b/src/public-api.ts
index 37c9a28..d621e75 100644
--- a/src/public-api.ts
+++ b/src/public-api.ts
@@ -17,7 +17,14 @@ declare global {
   }
 
   interface Date {
-    toISOStringDate(): string;
+    /**
+     * @param isLocal Indicates whether the date should be returned in local time. If omitted, the date is returned in UTC.
+     * @returns date in ISO-8601 format (`YYYY-MM-DD`)
+     *
+     * @author Ian Wenneckers
+     * @since 1.1.0
+     */
+    toISOStringDate(isLocal?: boolean): string;
   }
 
   interface Map<K, V> {