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+---
+title: add_days
+tags: date,intermediate
+---
+
+Calculates the date of `n` days from the given date.
+
+- Use `datetime.timedelta` and the `+` operator to calculate the new `datetime.datetime` value after adding `n` days to `d`.
+- Omit the second argument, `d`, to use a default value of `datetime.today()`.
+
+```py
+from datetime import datetime, timedelta
+
+def add_days(n, d = datetime.today()):
+  return d + timedelta(n)
+```
+
+```py
+from datetime import date
+
+add_days(5, date(2020, 10, 25)) # date(2020, 10, 30)
+add_days(-5, date(2020, 10, 25)) # date(2020, 10, 20)
+```