diff --git a/components.d.ts b/components.d.ts
index 3e65c3cc..d77d814b 100644
--- a/components.d.ts
+++ b/components.d.ts
@@ -135,13 +135,18 @@ declare module '@vue/runtime-core' {
     NConfigProvider: typeof import('naive-ui')['NConfigProvider']
     NDivider: typeof import('naive-ui')['NDivider']
     NEllipsis: typeof import('naive-ui')['NEllipsis']
+    NForm: typeof import('naive-ui')['NForm']
+    NFormItem: typeof import('naive-ui')['NFormItem']
     NH1: typeof import('naive-ui')['NH1']
     NH3: typeof import('naive-ui')['NH3']
     NIcon: typeof import('naive-ui')['NIcon']
     NLayout: typeof import('naive-ui')['NLayout']
     NLayoutSider: typeof import('naive-ui')['NLayoutSider']
     NMenu: typeof import('naive-ui')['NMenu']
+    NRadio: typeof import('naive-ui')['NRadio']
+    NRadioGroup: typeof import('naive-ui')['NRadioGroup']
     NSpace: typeof import('naive-ui')['NSpace']
+    NSwitch: typeof import('naive-ui')['NSwitch']
     NTable: typeof import('naive-ui')['NTable']
     NumeronymGenerator: typeof import('./src/tools/numeronym-generator/numeronym-generator.vue')['default']
     OtpCodeGeneratorAndValidator: typeof import('./src/tools/otp-code-generator-and-validator/otp-code-generator-and-validator.vue')['default']
diff --git a/src/tools/crontab-generator/crontab-generator.service.test.ts b/src/tools/crontab-generator/crontab-generator.service.test.ts
index 388a92bf..d45fadfe 100644
--- a/src/tools/crontab-generator/crontab-generator.service.test.ts
+++ b/src/tools/crontab-generator/crontab-generator.service.test.ts
@@ -4,6 +4,7 @@ import { getCronType, getLastExecutionTimes, isCronValid } from './crontab-gener
 describe('crontab-generator', () => {
   describe('isCronValid', () => {
     it('should return true for all valid formats', () => {
+      // standard format
       expect(isCronValid('0 0 * * 1-5')).toBe(true);
       expect(isCronValid('23 0-20/2 * * *')).toBe(true);
 
@@ -11,6 +12,24 @@ describe('crontab-generator', () => {
       expect(isCronValid('0 11-22 ? * MON-FRI *')).toBe(true);
       expect(isCronValid('0 0 ? * 1 *')).toBe(true);
     });
+    it('should check standard format', () => {
+      // standard format
+      expect(isCronValid('0 0 * * 1-5', 'standard')).toBe(true);
+      expect(isCronValid('23 0-20/2 * * *', 'standard')).toBe(true);
+
+      // AWS format
+      expect(isCronValid('0 11-22 ? * MON-FRI *', 'standard')).toBe(false);
+      expect(isCronValid('0 0 ? * 1 *', 'standard')).toBe(false);
+    });
+    it('should check aws format', () => {
+      // standard format
+      expect(isCronValid('0 0 * * 1-5', 'aws')).toBe(false);
+      expect(isCronValid('23 0-20/2 * * *', 'aws')).toBe(false);
+
+      // AWS format
+      expect(isCronValid('0 11-22 ? * MON-FRI *', 'aws')).toBe(true);
+      expect(isCronValid('0 0 ? * 1 *', 'aws')).toBe(true);
+    });
     it('should return false for all invalid formats', () => {
       expect(isCronValid('aert')).toBe(false);
       expect(isCronValid('40 *')).toBe(false);
diff --git a/src/tools/crontab-generator/crontab-generator.service.ts b/src/tools/crontab-generator/crontab-generator.service.ts
index 1d44405b..8e4b7b7e 100644
--- a/src/tools/crontab-generator/crontab-generator.service.ts
+++ b/src/tools/crontab-generator/crontab-generator.service.ts
@@ -1,6 +1,8 @@
 import { parseExpression } from 'cron-parser';
 import EventCronParser from 'event-cron-parser';
 
+export type CronType = 'standard' | 'aws';
+
 export function getLastExecutionTimes(cronExpression: string, tz: string | undefined = undefined, count: number = 5) {
   if (getCronType(cronExpression) === 'standard') {
     const interval = parseExpression(cronExpression, { tz });
@@ -22,18 +24,19 @@ export function getLastExecutionTimes(cronExpression: string, tz: string | undef
   return [];
 }
 
-export function isCronValid(v: string) {
-  return !!getCronType(v);
+export function isCronValid(cronExpression: string, cronType: CronType | 'any' = 'any') {
+  const expressionCronType = getCronType(cronExpression);
+  return cronType === 'any' ? !!expressionCronType : expressionCronType === cronType;
 }
 
-export function getCronType(v: string) {
+export function getCronType(cronExpression: string) {
   try {
-    parseExpression(v);
+    parseExpression(cronExpression);
     return 'standard';
   }
   catch (_) {
     try {
-      const parsed = new EventCronParser(v);
+      const parsed = new EventCronParser(cronExpression);
       parsed.validate();
       return 'aws';
     }
diff --git a/src/tools/crontab-generator/crontab-generator.vue b/src/tools/crontab-generator/crontab-generator.vue
index 654e278a..4dc48123 100644
--- a/src/tools/crontab-generator/crontab-generator.vue
+++ b/src/tools/crontab-generator/crontab-generator.vue
@@ -2,7 +2,7 @@
 import cronstrue from 'cronstrue';
 import ctz from 'countries-and-timezones';
 import getTimezoneOffset from 'get-timezone-offset';
-import { getCronType, getLastExecutionTimes, isCronValid } from './crontab-generator.service';
+import { type CronType, getLastExecutionTimes, isCronValid } from './crontab-generator.service';
 import { useStyleStore } from '@/stores/style.store';
 import { useQueryParamOrStorage } from '@/composable/queryParams';
 
@@ -20,10 +20,13 @@ const cronstrueConfig = reactive({
 
 // getTimezoneOffset(tz.name, now) / 60
 const browserTimezone = Intl.DateTimeFormat().resolvedOptions().timeZone;
-const allTimezones = Object.values(ctz.getAllTimezones()).map(tz => ({
-  value: tz.name,
-  label: `${tz.name === browserTimezone ? 'Browser TZ - ' : ''}${tz.name} (${tz.utcOffset === tz.dstOffset ? tz.utcOffsetStr : `${tz.utcOffsetStr}/${tz.dstOffsetStr}`})`,
-}));
+const allTimezones = Object.values(ctz.getAllTimezones()).map((tz) => {
+  const timezoneUTCDSTOffset = tz.utcOffset === tz.dstOffset ? tz.utcOffsetStr : `${tz.utcOffsetStr}/${tz.dstOffsetStr}`;
+  return {
+    value: tz.name,
+    label: `${tz.name === browserTimezone ? 'Browser TZ - ' : ''}${tz.name} (${timezoneUTCDSTOffset})`,
+  };
+});
 const currentTimezone = useQueryParamOrStorage({ name: 'tz', storageName: 'crongen:tz', defaultValue: browserTimezone });
 watchEffect(() => {
   cronstrueConfig.tzOffset = -getTimezoneOffset(currentTimezone.value, new Date()) / 60;
@@ -136,19 +139,24 @@ const awsHelpers = [
   },
 ];
 
-const cronType = computed({
-  get() {
-    return getCronType(cron.value);
-  },
-  set(newCronType) {
+const defaultAWSCronExpression = '0 0 ? * 1 *';
+const defaultStandardCronExpression = '40 * * * *';
+const cronType = ref<CronType>('standard');
+watch(cronType,
+  (newCronType) => {
     if (newCronType === 'aws') {
-      cron.value = '0 0 ? * 1 *';
+      if (!cron.value || cron.value === defaultStandardCronExpression) {
+        cron.value = defaultAWSCronExpression;
+      }
     }
-    else {
-      cron.value = '40 * * * *';
+    else if (newCronType === 'standard') {
+      if (!cron.value || cron.value === defaultAWSCronExpression) {
+        cron.value = defaultStandardCronExpression;
+      }
     }
   },
-});
+);
+
 const getHelpers = computed(() => {
   if (cronType.value === 'aws') {
     return awsHelpers;
@@ -165,7 +173,7 @@ const cronString = computed(() => {
 
 const cronValidationRules = [
   {
-    validator: (value: string) => isCronValid(value),
+    validator: (value: string) => isCronValid(value, cronType.value),
     message: 'This cron is invalid',
   },
 ];
@@ -245,7 +253,7 @@ const executionTimesString = computed(() => {
   </c-card>
   <c-card>
     <pre v-if="cronType === 'standard'">
--- Standard CRON Syntax --
+      -- Standard CRON Syntax --
 ┌──────────── [optional] seconds (0 - 59)
 | ┌────────── minute (0 - 59)
 | | ┌──────── hour (0 - 23)
@@ -256,7 +264,7 @@ const executionTimesString = computed(() => {
 * * * * * * command</pre>
 
     <pre v-if="cronType === 'aws'">
--- AWS CRON Syntax --
+      -- AWS CRON Syntax --
 ┌──────────── minute (0 - 59)
 | ┌────────── hour (0 - 23)
 | | ┌──────── day of month (1 - 31) OR ? OR L OR W