Add days_diff

snippets/days_diff.md

@@ -0,0 +1,19 @@
+---
+title: days_diff
+tags: date,beginner
+---
+
+Calculates the day difference between two dates.
+
+- Subtract `start` from `end` and use `datetime.timedelta.days` to get the day difference.
+
+```py
+def days_diff(start, end):
+  return (end - start).days
+```
+
+```py
+from datetime import date
+
+days_diff(date(2020, 10, 25), date(2020, 10, 28)) # 3
+```