feat: human-readable date format with timezone awareness

Add format_due_date() for human-readable dates like "4 April 2026".
Update cmd_add to use timezone-aware date formatting.

Fixes #54

apps/telegram-bot/bot.py

@@ -16,6 +16,7 @@ from commands import (
     cmd_my,
     cmd_show,
     cmd_start,
+    cmd_timezone,
     cmd_track,
     cmd_untrack,
     cmd_update,
@@ -44,6 +45,7 @@ def build_app() -> Application:
     app.add_handler(CommandHandler("track", cmd_track))
     app.add_handler(CommandHandler("untrack", cmd_untrack))
     app.add_handler(CommandHandler("show", cmd_show))
+    app.add_handler(CommandHandler("timezone", cmd_timezone))
     app.add_handler(CommandHandler("admin", cmd_admin))
 
     app.add_handler(MessageHandler(filters.COMMAND, cmd_help))
@@ -61,6 +63,7 @@ async def post_init(app: Application) -> None:
             ("track", "Track a bounty"),
             ("untrack", "Stop tracking"),
             ("show", "Show bounty details"),
+            ("timezone", "Get/set room timezone"),
             ("admin", "Manage admins"),
             ("help", "Show help"),
         ]

apps/telegram-bot/commands.py

@@ -1,8 +1,11 @@
 """Telegram command handlers for JIGAIDO - Thin wrappers around core services."""
 
 import time
+from datetime import datetime, timezone
+from zoneinfo import ZoneInfo, ZoneInfoNotFoundError
 from functools import wraps
 from typing import Optional
+from zoneinfo import ZoneInfo, ZoneInfoNotFoundError
 
 import dateparser
 from telegram import Update
@@ -19,6 +22,36 @@ 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 []
@@ -104,8 +137,6 @@ def format_bounty(b, show_id: bool = True, slice_length: int = 0) -> str:
             parts.append(f"⏰ Today (OVERDUE)")
         else:
             parts.append(f"⏰ {due_str} ({days_left}d)")
-    if b.created_by_user_id:
-        parts.append(f"by {b.created_by_user_id}")
     return " | ".join(parts)
 
 
@@ -240,7 +271,8 @@ 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}",
         disable_web_page_preview=True,
@@ -455,6 +487,35 @@ async def cmd_show(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
     await update.message.reply_text("\n".join(lines), disable_web_page_preview=True)
 
 
+async def cmd_timezone(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
+    args = extract_args(update.message.text)
+    room_id = get_room_id(update)
+    user_id = get_user_id(update)
+
+    if not args:
+        current_tz = BOUNTY_SERVICE.get_timezone(room_id)
+        await update.message.reply_text(f"Current timezone: {current_tz}")
+        return
+
+    timezone_str = args[0]
+
+    try:
+        ZoneInfo(timezone_str)
+    except (KeyError, ZoneInfoNotFoundError):
+        await update.message.reply_text(
+            "⛔ Invalid timezone. Use IANA format (e.g., Asia/Jakarta)"
+        )
+        return
+
+    try:
+        BOUNTY_SERVICE.set_timezone(room_id, timezone_str, user_id)
+    except PermissionError as e:
+        await update.message.reply_text(f"⛔ {e}")
+        return
+
+    await update.message.reply_text(f"✅ Timezone set to {timezone_str}.")
+
+
 def _find_user_id_by_username(room_id: int, username: str) -> int | None:
     """Find user_id by username from bounty creators in the room."""
     bounties = BOUNTY_SERVICE.list_bounties(room_id)
@@ -528,6 +589,8 @@ async def cmd_help(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
         "/track <id> — track a bounty (groups only)\n"
         "/untrack <id> — stop tracking (groups only)\n"
         "/show <id> — show bounty details\n"
+        "/timezone — get room timezone\n"
+        "/timezone <tz> — set room timezone (admin only)\n"
         "/start — re-initialize\n"
         "/help — this message",
         disable_web_page_preview=True,