diff --git a/pkg/grid/src/components/TreatyMeta.tsx b/pkg/grid/src/components/TreatyMeta.tsx
index baa9d861a..00974bb70 100644
--- a/pkg/grid/src/components/TreatyMeta.tsx
+++ b/pkg/grid/src/components/TreatyMeta.tsx
@@ -1,5 +1,5 @@
 import React from 'react';
-import { Treaty } from '@urbit/api';
+import { daToDate, Treaty } from '@urbit/api';
 
 import moment from 'moment';
 import { Attribute } from './Attribute';
@@ -15,7 +15,7 @@ export function TreatyMeta(props: { treaty: Treaty }) {
         {ship}/{desk}
       </Attribute>
       <Attribute title="Last Software Update" attr="case">
-        {moment(cass.da).format('YYYY.MM.DD')}
+        {moment(daToDate(cass.da)).format('YYYY.MM.DD')}
       </Attribute>
       {meta.map((d) => (
         <Attribute key={d} attr={d}>
diff --git a/pkg/npm/api/hood/types.ts b/pkg/npm/api/hood/types.ts
index 4b561d15b..4e59cb0bd 100644
--- a/pkg/npm/api/hood/types.ts
+++ b/pkg/npm/api/hood/types.ts
@@ -113,12 +113,12 @@ export interface Cass {
    */
   ud: number;
   /**
-   * Timestamp of revision, as unix timestamp
+   * Timestamp of revision, as stringifed `@da`
    *
    * @remarks
    * If \@da is outside valid positive unix timestamp, value will be zero
    */
-  da: number;
+  da: string;
 }
 
 /**