From 0c5fef739de40a406d2db33c127c7234b73bd48d Mon Sep 17 00:00:00 2001
From: Ariane Emory <ariane.emory@protonmail.com>
Date: Sat, 21 Feb 2026 15:12:52 -0500
Subject: [PATCH] feat: show full datetime for non-today messages in timeline
 and fork dialogs

---
 .../session/dialog-fork-from-timeline.tsx     |  2 +-
 .../tui/routes/session/dialog-timeline.tsx    |  2 +-
 packages/opencode/src/util/locale.ts          | 21 +++++++++++++++++++
 3 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/packages/opencode/src/cli/cmd/tui/routes/session/dialog-fork-from-timeline.tsx b/packages/opencode/src/cli/cmd/tui/routes/session/dialog-fork-from-timeline.tsx
index 62154cce5636..d85a39a1a0f0 100644
--- a/packages/opencode/src/cli/cmd/tui/routes/session/dialog-fork-from-timeline.tsx
+++ b/packages/opencode/src/cli/cmd/tui/routes/session/dialog-fork-from-timeline.tsx
@@ -30,7 +30,7 @@ export function DialogForkFromTimeline(props: { sessionID: string; onMove: (mess
       result.push({
         title: part.text.replace(/\n/g, " "),
         value: message.id,
-        footer: Locale.time(message.time.created),
+        footer: Locale.shortDateTime(message.time.created),
         onSelect: async (dialog) => {
           const forked = await sdk.client.session.fork({
             sessionID: props.sessionID,
diff --git a/packages/opencode/src/cli/cmd/tui/routes/session/dialog-timeline.tsx b/packages/opencode/src/cli/cmd/tui/routes/session/dialog-timeline.tsx
index 87248a6a8ba6..2cf50ef2e42d 100644
--- a/packages/opencode/src/cli/cmd/tui/routes/session/dialog-timeline.tsx
+++ b/packages/opencode/src/cli/cmd/tui/routes/session/dialog-timeline.tsx
@@ -31,7 +31,7 @@ export function DialogTimeline(props: {
       result.push({
         title: part.text.replace(/\n/g, " "),
         value: message.id,
-        footer: Locale.time(message.time.created),
+        footer: Locale.shortDateTime(message.time.created),
         onSelect: (dialog) => {
           dialog.replace(() => (
             <DialogMessage messageID={message.id} sessionID={props.sessionID} setPrompt={props.setPrompt} />
diff --git a/packages/opencode/src/util/locale.ts b/packages/opencode/src/util/locale.ts
index 653da09a0b7d..26898c850482 100644
--- a/packages/opencode/src/util/locale.ts
+++ b/packages/opencode/src/util/locale.ts
@@ -1,4 +1,6 @@
 export namespace Locale {
+  const MONTHS = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
+
   export function titlecase(str: string) {
     return str.replace(/\b\w/g, (c) => c.toUpperCase())
   }
@@ -28,6 +30,25 @@ export namespace Locale {
     }
   }
 
+  export function shortDateTime(input: number): string {
+    const date = new Date(input)
+    const now = new Date()
+    const isToday =
+      date.getFullYear() === now.getFullYear() &&
+      date.getMonth() === now.getMonth() &&
+      date.getDate() === now.getDate()
+
+    const timeStr = time(input)
+
+    if (isToday) {
+      return timeStr
+    } else {
+      const month = MONTHS[date.getMonth()]
+      const day = date.getDate()
+      return `${month} ${day} ${timeStr}`
+    }
+  }
+
   export function number(num: number): string {
     if (num >= 1000000) {
       return (num / 1000000).toFixed(1) + "M"