diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index 257c9fd..ed79c9b 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -16,8 +16,14 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Install Dependencies
+        run: npm install
+
       - name: json-yaml-validate
         id: json-yaml-validate
         uses: GrantBirki/json-yaml-validate@v3.2.1
         with:
-          comment: "true"
\ No newline at end of file
+          comment: "true"
+      
+      - name: Validate Dates in data.yml
+        run: node validateDates.js
\ No newline at end of file
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..a818c5f
--- /dev/null
+++ b/package.json
@@ -0,0 +1,7 @@
+{
+  "name": "gowno",
+  "version": "1.0.0",
+  "dependencies": {
+    "js-yaml": "^4.1.0"
+  }
+}
diff --git a/validateDates.js b/validateDates.js
new file mode 100644
index 0000000..d5499c3
--- /dev/null
+++ b/validateDates.js
@@ -0,0 +1,34 @@
+const fs = require('fs');
+const jsyaml = require('js-yaml');
+
+function isValidDate(date) {
+    return date instanceof Date && !isNaN(date.getTime());
+}
+
+try {
+    const fileContent = fs.readFileSync('data.yml', 'utf8');
+    const data = jsyaml.load(fileContent);
+    let invalidDates = [];
+    for (let category in data) {
+        if (Array.isArray(data[category])) {
+            data[category].forEach(program => {
+                if (program.deadline) {
+                    const d = new Date(program.deadline);
+                    if (!isValidDate(d)) {
+                        invalidDates.push({ name: program.name, deadline: program.deadline });
+                    }
+                }
+            });
+        }
+    }
+    if (invalidDates.length) {
+        console.warn('Found invalid dates in data.yml:');
+        console.warn(invalidDates);
+        process.exit(1);
+    } else {
+        console.log('All dates are valid.');
+    }
+} catch (err) {
+    console.error(err);
+    process.exit(1);
+}