diff --git a/src/components/moderation/FieldComparison.tsx b/src/components/moderation/FieldComparison.tsx
index 017cea2d..dd41e4a3 100644
--- a/src/components/moderation/FieldComparison.tsx
+++ b/src/components/moderation/FieldComparison.tsx
@@ -6,8 +6,8 @@ import { ArrayFieldDiff } from './ArrayFieldDiff';
 import { SpecialFieldDisplay } from './SpecialFieldDisplay';
 
 // Helper to format compact values (truncate long strings)
-function formatCompactValue(value: any, maxLength = 30): string {
-  const formatted = formatFieldValue(value);
+function formatCompactValue(value: any, precision?: 'day' | 'month' | 'year', maxLength = 30): string {
+  const formatted = formatFieldValue(value, precision);
   if (formatted.length > maxLength) {
     return formatted.substring(0, maxLength) + '...';
   }
@@ -20,7 +20,12 @@ interface FieldDiffProps {
 }
 
 export function FieldDiff({ change, compact = false }: FieldDiffProps) {
-  const { field, oldValue, newValue, changeType } = change;
+  const { field, oldValue, newValue, changeType, metadata } = change;
+
+  // Extract precision for date fields
+  const precision = metadata?.precision;
+  const oldPrecision = metadata?.oldPrecision;
+  const newPrecision = metadata?.newPrecision;
 
   // Check if this is an array field that needs special handling
   if (Array.isArray(oldValue) && Array.isArray(newValue)) {
@@ -55,7 +60,7 @@ export function FieldDiff({ change, compact = false }: FieldDiffProps) {
     if (changeType === 'added') {
       return (
         <Badge variant="outline" className={getChangeColor()}>
-          {fieldName}: + {formatCompactValue(newValue)}
+          {fieldName}: + {formatCompactValue(newValue, precision)}
         </Badge>
       );
     }
@@ -63,7 +68,7 @@ export function FieldDiff({ change, compact = false }: FieldDiffProps) {
     if (changeType === 'removed') {
       return (
         <Badge variant="outline" className={getChangeColor()}>
-          {fieldName}: <span className="line-through">{formatCompactValue(oldValue)}</span>
+          {fieldName}: <span className="line-through">{formatCompactValue(oldValue, precision)}</span>
         </Badge>
       );
     }
@@ -71,7 +76,7 @@ export function FieldDiff({ change, compact = false }: FieldDiffProps) {
     if (changeType === 'modified') {
       return (
         <Badge variant="outline" className={getChangeColor()}>
-          {fieldName}: {formatCompactValue(oldValue)} → {formatCompactValue(newValue)}
+          {fieldName}: {formatCompactValue(oldValue, oldPrecision || precision)} → {formatCompactValue(newValue, newPrecision || precision)}
         </Badge>
       );
     }
@@ -89,24 +94,24 @@ export function FieldDiff({ change, compact = false }: FieldDiffProps) {
       
       {changeType === 'added' && (
         <div className="text-sm text-green-600 dark:text-green-400">
-          + {formatFieldValue(newValue)}
+          + {formatFieldValue(newValue, precision)}
         </div>
       )}
       
       {changeType === 'removed' && (
         <div className="text-sm text-red-600 dark:text-red-400 line-through">
-          {formatFieldValue(oldValue)}
+          {formatFieldValue(oldValue, precision)}
         </div>
       )}
       
       {changeType === 'modified' && (
         <div className="flex items-center gap-2 text-sm">
           <span className="text-red-600 dark:text-red-400 line-through">
-            {formatFieldValue(oldValue)}
+            {formatFieldValue(oldValue, oldPrecision || precision)}
           </span>
           <ArrowRight className="h-3 w-3 text-muted-foreground" />
           <span className="text-green-600 dark:text-green-400">
-            {formatFieldValue(newValue)}
+            {formatFieldValue(newValue, newPrecision || precision)}
           </span>
         </div>
       )}
diff --git a/src/components/moderation/SpecialFieldDisplay.tsx b/src/components/moderation/SpecialFieldDisplay.tsx
index 296d0f24..0fd1a200 100644
--- a/src/components/moderation/SpecialFieldDisplay.tsx
+++ b/src/components/moderation/SpecialFieldDisplay.tsx
@@ -186,6 +186,11 @@ function StatusFieldDisplay({ change, compact }: { change: FieldChange; compact:
 }
 
 function DateFieldDisplay({ change, compact }: { change: FieldChange; compact: boolean }) {
+  // Extract precision from metadata
+  const precision = change.metadata?.precision;
+  const oldPrecision = change.metadata?.oldPrecision;
+  const newPrecision = change.metadata?.newPrecision;
+  
   if (compact) {
     return (
       <Badge variant="outline" className="text-teal-600 dark:text-teal-400">
@@ -204,29 +209,34 @@ function DateFieldDisplay({ change, compact }: { change: FieldChange; compact: b
       <div className="text-sm font-medium flex items-center gap-2">
         <Calendar className="h-4 w-4" />
         {formatFieldName(change.field)}
+        {precision && (
+          <Badge variant="outline" className="text-xs ml-2">
+            {precision === 'year' ? 'Year Only' : precision === 'month' ? 'Month & Year' : 'Full Date'}
+          </Badge>
+        )}
       </div>
       
       {change.changeType === 'modified' && (
         <div className="flex items-center gap-3 text-sm">
           <span className="text-red-600 dark:text-red-400 line-through">
-            {formatFieldValue(change.oldValue)}
+            {formatFieldValue(change.oldValue, oldPrecision || precision)}
           </span>
           <ArrowRight className="h-3 w-3 text-muted-foreground" />
           <span className="text-green-600 dark:text-green-400">
-            {formatFieldValue(change.newValue)}
+            {formatFieldValue(change.newValue, newPrecision || precision)}
           </span>
         </div>
       )}
 
       {change.changeType === 'added' && (
         <div className="text-sm text-green-600 dark:text-green-400">
-          + {formatFieldValue(change.newValue)}
+          + {formatFieldValue(change.newValue, precision)}
         </div>
       )}
 
       {change.changeType === 'removed' && (
         <div className="text-sm text-red-600 dark:text-red-400 line-through">
-          {formatFieldValue(change.oldValue)}
+          {formatFieldValue(change.oldValue, precision)}
         </div>
       )}
     </div>
diff --git a/src/lib/entityValidationSchemas.ts b/src/lib/entityValidationSchemas.ts
index a9b4fd8d..57186cde 100644
--- a/src/lib/entityValidationSchemas.ts
+++ b/src/lib/entityValidationSchemas.ts
@@ -101,18 +101,10 @@ export const companyValidationSchema = z.object({
   company_type: z.enum(['manufacturer', 'designer', 'operator', 'property_owner']),
   description: z.string().max(2000, 'Description must be less than 2000 characters').optional(),
   person_type: z.enum(['company', 'individual', 'firm', 'organization']),
-  founded_year: z.string()
-    .optional()
-    .transform(val => {
-      if (!val || val.trim() === '') return undefined;
-      const num = Number(val);
-      return isNaN(num) ? undefined : num;
-    })
-    .refine(val => val === undefined || (typeof val === 'number' && val >= 1800 && val <= currentYear), {
-      message: `Founded year must be between 1800 and ${currentYear}`
-    }),
+  // Support both founded_date (preferred) and founded_year (legacy)
   founded_date: z.string().optional(),
   founded_date_precision: z.enum(['day', 'month', 'year']).optional(),
+  founded_year: z.number().int().min(1800).max(currentYear).optional().nullable(),
   headquarters_location: z.string().max(200, 'Location must be less than 200 characters').optional(),
   website_url: z.string().optional().refine((val) => {
     if (!val || val === '') return true;
diff --git a/src/lib/submissionChangeDetection.ts b/src/lib/submissionChangeDetection.ts
index e51b93ee..50addf49 100644
--- a/src/lib/submissionChangeDetection.ts
+++ b/src/lib/submissionChangeDetection.ts
@@ -8,6 +8,9 @@ export interface FieldChange {
   changeType: 'added' | 'removed' | 'modified';
   metadata?: {
     isCreatingNewLocation?: boolean;
+    precision?: 'day' | 'month' | 'year';
+    oldPrecision?: 'day' | 'month' | 'year';
+    newPrecision?: 'day' | 'month' | 'year';
   };
 }
 
@@ -234,28 +237,32 @@ export async function detectChanges(
 
       // Check for changes
       if (!isEqual(oldValue, newValue)) {
-        if (oldEmpty && !newEmpty) {
-          fieldChanges.push({
-            field: key,
-            oldValue,
-            newValue,
-            changeType: 'added',
-          });
-        } else if (newEmpty && !oldEmpty) {
-          fieldChanges.push({
-            field: key,
-            oldValue,
-            newValue,
-            changeType: 'removed',
-          });
-        } else {
-          fieldChanges.push({
-            field: key,
-            oldValue,
-            newValue,
-            changeType: 'modified',
-          });
+        const fieldChange: FieldChange = {
+          field: key,
+          oldValue,
+          newValue,
+          changeType: oldEmpty && !newEmpty ? 'added' : 
+                     newEmpty && !oldEmpty ? 'removed' : 
+                     'modified',
+        };
+        
+        // Add precision metadata for date fields
+        if (key.endsWith('_date') && !key.endsWith('_precision')) {
+          const precisionKey = `${key}_precision`;
+          const newPrecision = itemData[precisionKey];
+          const oldPrecision = originalData[precisionKey];
+          
+          if (newPrecision || oldPrecision) {
+            fieldChange.metadata = {
+              ...fieldChange.metadata,
+              precision: newPrecision || oldPrecision,
+              oldPrecision,
+              newPrecision,
+            };
+          }
         }
+        
+        fieldChanges.push(fieldChange);
       }
     });
 
@@ -490,14 +497,23 @@ function formatEntityType(entityType: string): string {
 /**
  * Format field value for display
  */
-export function formatFieldValue(value: any): string {
+export function formatFieldValue(value: any, precision?: 'day' | 'month' | 'year'): string {
   if (value === null || value === undefined) return 'None';
   if (typeof value === 'boolean') return value ? 'Yes' : 'No';
   
-  // Handle dates
+  // Handle dates with precision support
   if (value instanceof Date || (typeof value === 'string' && /^\d{4}-\d{2}-\d{2}/.test(value))) {
     try {
       const date = new Date(value);
+      
+      // Apply precision if provided
+      if (precision === 'year') {
+        return date.getFullYear().toString();
+      } else if (precision === 'month') {
+        return date.toLocaleDateString('en-US', { year: 'numeric', month: 'long' });
+      }
+      
+      // Default: full date
       return date.toLocaleDateString('en-US', { year: 'numeric', month: 'long', day: 'numeric' });
     } catch {
       return String(value);
@@ -525,6 +541,15 @@ export function formatFieldValue(value: any): string {
     return entries.map(([k, v]) => `${k}: ${v}`).join(', ');
   }
   
+  // Handle year-like numbers (prevent comma formatting for founded_year)
+  if (typeof value === 'number') {
+    const currentYear = new Date().getFullYear();
+    if (value >= 1800 && value <= currentYear + 10) {
+      return value.toString(); // Don't add commas for year values
+    }
+    return value.toLocaleString(); // Add commas for other numbers
+  }
+  
   // Handle URLs
   if (typeof value === 'string' && value.startsWith('http')) {
     try {