Timedelta

README.rst

@@ -166,7 +166,8 @@ The resulting ``events`` are a list of `icalendar events <https://icalendar.read
 
 ``between(start, end)`` returns all events happening between a start and an end time. Both arguments can be `datetime.datetime`_, `datetime.date`_, tuples of numbers passed as arguments to `datetime.datetime`_ or strings in the form of
 ``%Y%m%d`` (``yyyymmdd``) and ``%Y%m%dT%H%M%SZ`` (``yyyymmddThhmmssZ``).
-For examples, see ``at(a_date)`` above.
+Additionally, the ``end`` argument can be a ``datetime.timedelta`` to express that the end is relative to the ``start``.
+For examples of arguments, see ``at(a_date)`` above.
 
 .. code:: Python
 
@@ -394,6 +395,10 @@ These **Occurrences** are used internally and convert to **Components** for furt
 Changelog
 ---------
 
+- v3.2.0
+
+  - Allow ``datetime.timedelta`` as second argument to ``between(absolute_time, datetime.timedelta())``
+
 - v3.1.1
 
   - Fix: Remove duplication of modification with same sequence number, see `Issue 164 <https://github.com/niccokunzmann/python-recurring-ical-events/issues/164>`_

recurring_ical_events.py

@@ -327,7 +327,9 @@ def __init__(self, components: Sequence[ComponentAdapter]):
                     )
             else:
                 core = with_highest_sequence(core, component)
-        self.modifications: set[ComponentAdapter] = set(self.recurrence_id_to_modification.values())
+        self.modifications: set[ComponentAdapter] = set(
+            self.recurrence_id_to_modification.values()
+        )
         del component
         if core is None:
             raise InvalidCalendar(
@@ -718,6 +720,7 @@ def is_in_span(self, span_start: Time, span_stop: Time) -> bool:
         """Return whether the component is in the span."""
         return time_span_contains_event(span_start, span_stop, self.start, self.end)
 
+
 class EventAdapter(ComponentAdapter):
     """An icalendar event adapter."""
 
@@ -1031,9 +1034,15 @@ def at(self, date: DateArgument):
         dt = self.to_datetime(date)
         return self._between(dt, dt + self._DELTAS[len(date) - 3])
 
-    def between(self, start: DateArgument, stop: DateArgument):
+    def between(self, start: DateArgument, stop: DateArgument | datetime.timedelta):
         """Return events at a time between start (inclusive) and end (inclusive)"""
-        return self._between(self.to_datetime(start), self.to_datetime(stop))
+        start = self.to_datetime(start)
+        stop = (
+            start + stop
+            if isinstance(stop, datetime.timedelta)
+            else self.to_datetime(stop)
+        )
+        return self._between(start, stop)
 
     def _occurrences_to_components(
         self, occurrences: list[Occurrence]

test/test_issue_164_duplicated_event.py

@@ -3,12 +3,13 @@
 See https://github.com/niccokunzmann/python-recurring-ical-events/issues/164
 """
 
+
 def test_event_is_only_returned_once(calendars):
     """We should not see the same event twice!"""
-    events = calendars.issue_164_duplicated_event.at([2024,8])
+    events = calendars.issue_164_duplicated_event.at([2024, 8])
     for event in events:
         start = event["DTSTART"].dt
         duration = event["DTEND"].dt - event["DTSTART"].dt
-        print("start {} duration {}".format(start, duration))
+        print(f"start {start} duration {duration}")
         print(event.to_ical().decode())
-    assert len(events) == 2
+    assert len(events) == 2

test/test_timedelta_for_between.py

@@ -0,0 +1,27 @@
+"""This tests that a timedelta can be used as the second argument to between.
+
+This is useful when you do not want to calculate this yourself.
+"""
+
+from datetime import timedelta
+
+import pytest
+
+
+@pytest.mark.parametrize(
+    ("start", "delta", "count"),
+    [
+        ("20190301", timedelta(days=3), 0),
+        ("20190301", timedelta(days=5), 1),
+        ("20190301", timedelta(days=3, hours=8), 0),
+        ("20190301", timedelta(days=3, hours=9), 1),
+        ("20190301", timedelta(days=3, hours=8, seconds=1), 1),
+        ("20190304", timedelta(days=1), 1),
+        ("20190304", timedelta(hours=8), 0),
+        ("20190304", timedelta(hours=9), 1),
+    ],
+)
+def test_event_with_between_and_timedelta(calendars, start, delta, count):
+    """The event starts at 20190304T080000 and ends at 20190304T080000"""
+    events = calendars.one_event.between(start, delta)
+    assert len(events) == count