feat: human-readable date format with timezone awareness

- Add format_due_date() function that formats dates as '4 April 2026'
  or '4 April 2026 14:30 (Asia/Jakarta)' with timezone support
- Update format_bounty() to use timezone-aware date formatting
- Update cmd_bounty, cmd_my, cmd_add to pass room_id for timezone
- Dates now display in room's configured timezone
- Fixes #54

apps/telegram-bot/commands.py

@@ -1,6 +1,7 @@
 """Telegram command handlers for JIGAIDO - Thin wrappers around core services."""
 
 import time
+from datetime import datetime
 from functools import wraps
 from typing import Optional
 from zoneinfo import ZoneInfo, ZoneInfoNotFoundError
@@ -20,6 +21,34 @@ TRACKING_SERVICE = TrackingService(TRACKING_STORAGE, ROOM_STORAGE)
 TELEGRAM_BOT_USERNAME = "your_bot_username"
 
 
+def format_due_date(due_date_ts: int | None, timezone_str: str) -> str:
+    """Format due date as human-readable with timezone.
+
+    Examples:
+        No due date:     (none shown)
+        Date only:       4 April 2026
+        Date + time:     4 April 2026 14:30
+        With timezone:   4 April 2026 14:30 (Asia/Jakarta)
+    """
+    if not due_date_ts:
+        return ""
+
+    try:
+        tz = ZoneInfo(timezone_str)
+    except (KeyError, ZoneInfoNotFoundError):
+        tz = ZoneInfo("UTC")
+
+    dt = datetime.fromtimestamp(due_date_ts, tz=tz)
+
+    date_str = dt.strftime("%-d %B %Y")
+
+    if dt.hour != 0 or dt.minute != 0:
+        date_str += f" {dt.strftime('%H:%M')}"
+        date_str += f" ({timezone_str})"
+
+    return date_str
+
+
 def extract_args(text: str) -> list[str]:
     if not text:
         return []
@@ -49,7 +78,7 @@ def parse_args(args: list[str]) -> tuple[Optional[str], Optional[str], Optional[
     return text, link, due_date_ts
 
 
-def format_bounty(b, show_id: bool = True) -> str:
+def format_bounty(b, show_id: bool = True, room_id: int | None = None) -> str:
     parts = []
     if show_id:
         parts.append(f"[#{b.id}]")
@@ -58,7 +87,11 @@ def format_bounty(b, show_id: bool = True) -> str:
     if b.link:
         parts.append(f"🔗 {b.link}")
     if b.due_date_ts:
-        due_str = time.strftime("%Y-%m-%d", time.localtime(b.due_date_ts))
+        timezone_str = "UTC"
+        if room_id is not None:
+            timezone_str = BOUNTY_SERVICE.get_timezone(room_id)
+
+        due_str = format_due_date(b.due_date_ts, timezone_str)
         days_left = (b.due_date_ts - int(time.time())) // 86400
         if days_left < 0:
             parts.append(f"⏰ {due_str} (OVERDUE)")
@@ -102,7 +135,7 @@ async def cmd_bounty(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
         await update.message.reply_text("No bounties yet.")
         return
 
-    lines = [format_bounty(b, show_id=True) for b in bounties]
+    lines = [format_bounty(b, show_id=True, room_id=room_id) for b in bounties]
     await update.message.reply_text("\n".join(lines), disable_web_page_preview=True)
 
 
@@ -112,6 +145,7 @@ async def cmd_my(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
     if is_group(update):
         group_id = get_group_id(update)
         bounties = TRACKING_SERVICE.get_tracked_bounties(group_id, user_id)
+        room_id = group_id
     else:
         room_id = get_room_id(update)
         bounties = BOUNTY_SERVICE.list_bounties(room_id)
@@ -125,7 +159,7 @@ async def cmd_my(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
         await update.message.reply_text(msg)
         return
 
-    lines = [format_bounty(b, show_id=True) for b in bounties]
+    lines = [format_bounty(b, show_id=True, room_id=room_id) for b in bounties]
     await update.message.reply_text("\n".join(lines), disable_web_page_preview=True)
 
 
@@ -156,7 +190,8 @@ async def cmd_add(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
 
     due_str = ""
     if due_date_ts:
-        due_str = f" | Due: {time.strftime('%Y-%m-%d', time.localtime(due_date_ts))}"
+        timezone_str = BOUNTY_SERVICE.get_timezone(room_id)
+        due_str = f" | Due: {format_due_date(due_date_ts, timezone_str)}"
 
     await update.message.reply_text(
         f"✅ Bounty added (#{bounty.id}){due_str}",