Add mothers' day and fathers' day

Closes: #8

agenda/__init__.py

@@ -14,6 +14,7 @@ import holidays
 import pandas
 import pytz
 import requests
+from dateutil.easter import easter
 
 # from agenda import spacexdata
 
@@ -48,6 +49,55 @@ access_key = config.get("exchangerate", "access_key")
 data_dir = config.get("data", "dir")
 
 
+def next_uk_mothers_day() -> date:
+    """Calculate the date of the next UK Mother's Day from the current date."""
+    current_year = date.today().year
+
+    easter_date = easter(current_year)
+
+    # Calculate the date of Mother's Day, which is the fourth Sunday of Lent
+    mothers_day = easter_date + timedelta(weeks=3)
+
+    # Check if Mother's Day has already passed this year
+    today = date.today()
+    if today > mothers_day:
+        # If it has passed, calculate for the next year
+        current_year += 1
+        easter_date = easter(current_year)
+        mothers_day = easter_date + timedelta(weeks=3)
+
+    return mothers_day
+
+
+def next_uk_fathers_day() -> date:
+    """Calculate the date of the next UK Father's Day from the current date."""
+    # Get the current date
+    today = date.today()
+
+    # Calculate the day of the week for the current date (0 = Monday, 6 = Sunday)
+    current_day_of_week = today.weekday()
+
+    # Calculate the number of days until the next Sunday
+    days_until_sunday = (6 - current_day_of_week) % 7
+
+    # Calculate the date of the next Sunday
+    next_sunday = today + timedelta(days=days_until_sunday)
+
+    # Calculate the date of Father's Day, which is the third Sunday of June
+    fathers_day = date(next_sunday.year, 6, 1) + timedelta(
+        weeks=2, days=next_sunday.weekday()
+    )
+
+    # Check if Father's Day has already passed this year
+    if today > fathers_day:
+        # If it has passed, calculate for the next year
+        fathers_day = date(fathers_day.year + 1, 6, 1) + timedelta(
+            weeks=2, days=next_sunday.weekday()
+        )
+
+    return fathers_day
+
+
 def get_next_timezone_transition(tz_name: str) -> datetime:
     """Datetime of the next time the clocks change."""
     tz = pytz.timezone(tz_name)
@@ -188,6 +238,8 @@ def get_data() -> dict[str, str | object]:
         "stock_markets": stock_markets(),
         "uk_clock_change": get_next_timezone_transition("Europe/London"),
         "us_clock_change": get_next_timezone_transition("America/New_York"),
+        "mothers_day": next_uk_mothers_day(),
+        "fathers_day": next_uk_fathers_day(),
     }
 
     return reply

templates/index.html

@@ -19,6 +19,15 @@
       {{"{:.1f}".format(lockdown_days)}} days
       ({{"{:.2f}".format(lockdown_days / 7)}} weeks) so far</li> #}
     <li>The Economist: {{days(next_economist)}} (Thursday)</li>
+
+    <li>Mothers' day:
+      {{days(mothers_day)}}
+      {{mothers_day.strftime("%a, %d %b %Y")}}</li>
+
+    <li>Fathers' day:
+      {{days(fathers_day)}}
+      {{fathers_day.strftime("%a, %d %b %Y")}}</li>
+
     <li>UK bank holiday:
       {{days(bank_holiday["date"])}}
       {{bank_holiday["date"].strftime("%a, %d %b")}}