fix(formatter): don't use relative timestamps

Since we're not rerendering, relative timestamps don't make sense as
they don't update.

Author: cameronr

lua/opencode/ui/formatter.lua

@@ -194,7 +194,7 @@ function M._format_patch(output, part)
           '  %s Restore point `%s` - %s',
           icons.get('restore_point'),
           restore_point.id:sub(1, 8),
-          util.time_ago(restore_point.created_at)
+          util.format_time(restore_point.created_at)
         )
       )
       local restore_line = output:get_line_count()
@@ -235,7 +235,7 @@ function M.format_message_header(message)
   local icon = message.info.role == 'user' and icons.get('header_user') or icons.get('header_assistant')
 
   local time = message.info.time and message.info.time.created or nil
-  local time_text = (time and ' (' .. util.time_ago(time) .. ')' or '')
+  local time_text = (time and ' (' .. util.format_time(time) .. ')' or '')
   local role_hl = 'OpencodeMessageRole' .. role:sub(1, 1):upper() .. role:sub(2)
   local model_text = message.info.modelID and ' ' .. message.info.modelID or ''
   local debug_text = config.debug and ' [' .. message.info.id .. ']' or ''

lua/opencode/util.lua

@@ -187,6 +187,24 @@ function M.time_ago(timestamp)
   end
 end
 
+--- Format a timestamp as time (e.g., "10:23 AM" or "13 Oct 2025 03:32 PM")
+--- @param timestamp number
+--- @return string: Formatted time string
+function M.format_time(timestamp)
+  if timestamp > 1e12 then
+    timestamp = math.floor(timestamp / 1000)
+  end
+  
+  local now = os.time()
+  local today_start = os.time(os.date('*t', now)) - os.date('*t', now).hour * 3600 - os.date('*t', now).min * 60 - os.date('*t', now).sec
+  
+  if timestamp >= today_start then
+    return os.date('%I:%M %p', timestamp)
+  else
+    return os.date('%d %b %Y %I:%M %p', timestamp)
+  end
+end
+
 function M.index_of(tbl, value)
   for i, v in ipairs(tbl) do
     if v == value then

tests/helpers.lua

@@ -34,7 +34,7 @@ function M.replay_setup()
 
   renderer.reset()
 
-  M.mock_time_ago()
+  M.mock_time_utils()
 
   if not config.config then
     config.config = vim.deepcopy(config.defaults)
@@ -131,9 +131,10 @@ function M.mock_notify()
   }
 end
 
-function M.mock_time_ago()
+function M.mock_time_utils()
   local util = require('opencode.util')
   local original_time_ago = util.time_ago
+  local original_format_time = util.format_time
 
   ---@diagnostic disable-next-line: duplicate-set-field
   util.time_ago = function(timestamp)
@@ -142,9 +143,11 @@ function M.mock_time_ago()
     end
     return os.date('!%Y-%m-%d %H:%M:%S', timestamp)
   end
+  util.format_time = util.time_ago
 
   return function()
     util.time_ago = original_time_ago
+    util.format_time = original_format_time
   end
 end