fix timezone shenanigans

README.md

@@ -22,7 +22,8 @@ services:
       - "8004:8000"
     environment:
       # FILL THESE IN
-      BEAVERHABITS_URL: ""
+      TIMEZONE: EST
+      BEAVERHABITS_URL: "" # no path, just the base URL
       BEAVERHABITS_USERNAME: "" # yes i know this is bad
       BEAVERHABITS_PASSWORD: "" # however, i don't care
     restart: unless-stopped

app.py

@@ -1,7 +1,8 @@
 import os
 import time
 import logging
-import datetime
+from datetime import datetime, timedelta, date
+from zoneinfo import ZoneInfo
 import threading
 
 from flask import Flask, request, Response, abort, jsonify
@@ -12,12 +13,14 @@ import requests
 # -----------------------------------------------------------------------------
 # Configuration via ENV
 # -----------------------------------------------------------------------------
-BEAVER_URL = os.getenv("BEAVERHABITS_URL", "")
+BEAVER_URL = os.getenv("BEAVERHABITS_URL", "http://beaverhabits.lan")
 USERNAME   = os.getenv("BEAVERHABITS_USERNAME", "")
 PASSWORD   = os.getenv("BEAVERHABITS_PASSWORD", "")
 # How long to reuse a token (secs)
 TOKEN_TTL  = int(os.getenv("BEAVERHABITS_TOKEN_TTL", "3600"))
 
+TZ = ZoneInfo(os.getenv("TIMEZONE", "UTC"))
+
 # -----------------------------------------------------------------------------
 # Logging
 # -----------------------------------------------------------------------------
@@ -35,6 +38,10 @@ NS = {"D": "DAV:", "C": "urn:ietf:params:xml:ns:caldav"}
 for p, uri in NS.items():
     ET.register_namespace(p, uri)
 
+def to_bytes(elem: ET.Element) -> bytes:
+    """Serialize an ElementTree Element to UTF-8 XML with declaration."""
+    return ET.tostring(elem, encoding="utf-8", xml_declaration=True)
+
 # -----------------------------------------------------------------------------
 # Beaver Habits token cache with TTL
 # -----------------------------------------------------------------------------
@@ -73,51 +80,85 @@ def beaver_headers() -> dict[str,str]:
     return {"Accept": "application/json",
             "Authorization": f"Bearer {get_token()}"}
 
+# -----------------------------------------------------------------------------
+# Utility: Datetime functions
+# -----------------------------------------------------------------------------
+
+def local_now() -> datetime:
+    """
+    Return “now” as an aware datetime in our configured TZ.
+    """
+    return datetime.now(TZ)
+
+
+def next_midnight_local(now: datetime) -> datetime:
+    """
+    Given an aware datetime ‘now’, return tomorrow at 00:00 in the same TZ.
+    """
+    tomorrow = now.date() + timedelta(days=1)
+    # Year, month, day at midnight
+    return datetime(tomorrow.year, tomorrow.month, tomorrow.day, tzinfo=TZ)
+
 # -----------------------------------------------------------------------------
 # Utility: build iCalendar VTODO
 # -----------------------------------------------------------------------------
+
 def make_vtodo(uid: str, summary: str, completed: bool) -> bytes:
+    """
+    Construct a VCALENDAR/VTODO where:
+     - DTSTAMP = local_now()
+     - DUE     = next_midnight_local(local_now())
+    """
+    now = local_now()
+    due = next_midnight_local(now)
+
     cal = Calendar()
     cal.add("prodid", "-//CalDAV⇆BeaverHabits Proxy//EN")
     cal.add("version", "2.0")
+
     todo = Todo()
     todo.add("uid", uid)
     todo.add("summary", summary)
-    now = datetime.datetime.now(datetime.timezone.utc)
     todo.add("dtstamp", now)
-    todo.add("due", now + datetime.timedelta(days=1))
+    # todo.add("due", due) # causes problems
     todo.add("status", "COMPLETED" if completed else "NEEDS-ACTION")
+
     cal.add_component(todo)
     return cal.to_ical()
 
-def to_bytes(elem: ET.Element) -> bytes:
-    return ET.tostring(elem, encoding="utf-8", xml_declaration=True)
-
 # -----------------------------------------------------------------------------
 # Helper: fetch habits + today's completion from Beaver
 # -----------------------------------------------------------------------------
+
 def fetch_tasks() -> dict[str, dict]:
-    """Return a dict of {habit_id: {SUMMARY, STATUS, DTSTAMP, DUE}}."""
+    """
+    Fetch habit list + today's completion from Beaver Habits.
+    Returns a dict:
+      { habit_id: { "SUMMARY": <name>, "STATUS": <flag> } }
+    DATES are handled later by make_vtodo().
+    """
     try:
-        r = _session.get(f"{BEAVER_URL}/api/v1/habits", headers=beaver_headers(), timeout=5)
+        r = _session.get(f"{BEAVER_URL}/api/v1/habits",
+                         headers=beaver_headers(), timeout=5)
         r.raise_for_status()
         habits = r.json()
     except Exception as e:
         log.error("Failed to list habits: %s", e)
         return {}
 
-    today = datetime.date.today().strftime("%d-%m-%Y")
+    # Use the same date format Beaver expects
+    today_str = local_now().strftime("%d-%m-%Y")
     out: dict[str, dict] = {}
+
     for h in habits:
-        hid = h["id"]
+        hid  = h["id"]
         name = h["name"]
-        # check completion for today
         try:
             params = {
                 "date_fmt": "%d-%m-%Y",
-                "date_start": today,
-                "date_end": today,
-                "sort": "asc"
+                "date_start": today_str,
+                "date_end": today_str,
+                "sort": "asc",
             }
             rc = _session.get(
                 f"{BEAVER_URL}/api/v1/habits/{hid}/completions",
@@ -127,19 +168,17 @@ def fetch_tasks() -> dict[str, dict]:
             )
             rc.raise_for_status()
             done_list = rc.json()
-            completed = today in done_list
+            completed = today_str in done_list
         except Exception:
-            log.warning("Failed to get completions for %s", hid)
+            log.warning("Failed to fetch completions for habit %s", hid)
             completed = False
 
         out[hid] = {
             "SUMMARY": name,
             "STATUS": "COMPLETED" if completed else "NEEDS-ACTION",
-            "DTSTAMP": datetime.datetime.now(datetime.timezone.utc),
-            "DUE": datetime.datetime.now(datetime.timezone.utc) + datetime.timedelta(days=1),
         }
-    return out
 
+    return out
 # -----------------------------------------------------------------------------
 # Standard PROPFIND / discovery endpoints
 # -----------------------------------------------------------------------------
@@ -256,7 +295,7 @@ def single_task(uid):
 
     summary = tasks_map[uid]["SUMMARY"]
     completed = (tasks_map[uid]["STATUS"] == "COMPLETED")
-    today = datetime.date.today()
+    today = date.today()
 
     if request.method == "GET":
         return Response(make_vtodo(uid, summary, completed),