first commit

2026-07-13 13:19:26 +02:00
commit bd562b3da6
50 changed files with 2221 additions and 0 deletions
@@ -0,0 +1,2 @@
+def invoice_period(dt, split_day=15):
+    return f"{dt:%Y-%m}-01–{split_day:02d}" if dt.day <= split_day else f"{dt:%Y-%m}-{split_day + 1:02d}–koniec"