Add months_diff

snippets/months_diff.md

@@ -0,0 +1,22 @@
+---
+title: months_diff
+tags: date,beginner
+---
+
+Calculates the month difference between two dates.
+
+- Subtract `start` from `end` and use `datetime.timedelta.days` to get the day difference.
+- Divide by `30` and use `math.ceil()` to get the difference in months (rounded up).
+
+```py
+from math import ceil
+
+def months_diff(start, end):
+  return ceil((end - start).days / 30)
+```
+
+```py
+from datetime import date
+
+months_diff(date(2020, 10, 28), date(2020, 11, 25)) # 1
+```