feat: show full datetime for non-today messages in timeline and fork dialogues

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,

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} />

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"