Change exp leveling system

core/member_sync.py

@@ -2,9 +2,11 @@
 
 from __future__ import annotations
 
+import calendar
 import logging
 from datetime import datetime, date
 from dataclasses import dataclass, field
+from zoneinfo import ZoneInfo
 
 import discord
 
@@ -13,6 +15,20 @@ from . import sheets
 
 log = logging.getLogger(__name__)
 _PLACEHOLDER = {"-", "x", "n/a", "none", "ei"}
+_TZ = ZoneInfo("Europe/Tallinn")
+
+
+def today_local() -> date:
+    """Today's date in Europe/Tallinn — the bot's operational timezone, independent of host TZ."""
+    return datetime.now(_TZ).date()
+
+
+def _shift_year_safe(d: date, year: int) -> date:
+    """Move `d` to `year`; Feb 29 falls back to Feb 28 when the target year is non-leap."""
+    try:
+        return d.replace(year=year)
+    except ValueError:
+        return d.replace(year=year, day=28)
 
 
 def _is_placeholder(val: str) -> bool:
@@ -72,7 +88,7 @@ def _parse_birthday(raw: str) -> date | None:
     raw = str(raw).strip()
     if _is_placeholder(raw):
         return None
-    today = date.today()
+    today = today_local()
     for fmt, has_year in [("%d/%m/%Y", True), ("%Y-%m-%d", True), ("%m-%d", False)]:
         try:
             parsed = datetime.strptime(raw, fmt).date()
@@ -90,21 +106,32 @@ def _is_birthday_soon(birthday_str: str, window_days: int | None = None) -> bool
     if bday is None:
         return False
     window = window_days or config.BIRTHDAY_WINDOW_DAYS
-    today = date.today()
-    this_year_bday = bday.replace(year=today.year)
+    today = today_local()
+    this_year_bday = _shift_year_safe(bday, today.year)
     if this_year_bday < today:
-        this_year_bday = bday.replace(year=today.year + 1)
+        this_year_bday = _shift_year_safe(bday, today.year + 1)
     delta = (this_year_bday - today).days
     return 0 <= delta <= window
 
 
 def is_birthday_today(birthday_str: str) -> bool:
-    """Return True if today is the member's birthday (any supported date format)."""
+    """Return True if today is the member's birthday (any supported date format).
+
+    Feb 29 babies are observed on Feb 28 in non-leap years.
+    """
     bday = _parse_birthday(birthday_str)
     if bday is None:
         return False
-    today = date.today()
-    return bday.month == today.month and bday.day == today.day
+    today = today_local()
+    if bday.month == today.month and bday.day == today.day:
+        return True
+    if (
+        bday.month == 2 and bday.day == 29
+        and today.month == 2 and today.day == 28
+        and not calendar.isleap(today.year)
+    ):
+        return True
+    return False
 
 
 async def sync_member(