Write a new script to calculate next Sunday's date

Makefile

@@ -36,7 +36,7 @@ nethack-commit: $(NETHACK_LOGFILE_DATA_FILE)
 
 weeknotes: YEAR=$(shell date '+%Y')
 weeknotes: WEEK_NUMBER=$(shell date '+%V')
-weeknotes: UPCOMING_SUNDAY=$(shell date -v +Sun +%FT%T%z)
+weeknotes: UPCOMING_SUNDAY=$(shell scripts/next_sunday.py)
 weeknotes: PAGE_PATH=blog/$(YEAR)/weeknotes-$(YEAR)w$(WEEK_NUMBER).md
 weeknotes: $(CONTENT_PATH)/$(PAGE_PATH)
 	hugo new -k weeknotes --clock "$(UPCOMING_SUNDAY)" -c "$(CONTENT_PATH)" "$(PAGE_PATH)"

scripts/next_sunday.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+
+import datetime
+import time
+import zoneinfo
+
+def main():
+    today = datetime.date.today()
+
+    current_weekday = today.weekday()
+    if current_weekday == 6:
+        days_to_next_sunday = 6
+    else:
+        days_to_next_sunday = 6 - current_weekday
+
+    delta = datetime.timedelta(days=days_to_next_sunday)
+
+    noon = datetime.time(hour=12)
+
+    timezone = datetime.datetime.now().astimezone().tzinfo
+    next_sunday_noon = datetime.datetime.combine(
+        today + delta,
+        noon,
+        tzinfo=timezone
+    )
+
+    print(next_sunday_noon.isoformat())
+
+    return 0
+
+if __name__ == "__main__":
+    main()