Branding: adjust duration string for 1-day events

Instead of:
  'January 1 - January 1'
Do:
  'January 1'

1 files changed, 5 insertions, 0 deletions

diff --git a/bot/exts/backend/branding/_cog.py b/bot/exts/backend/branding/_cog.py
index fdc4a4167..47c379a34 100644
--- a/bot/exts/backend/branding/_cog.py
+++ b/bot/exts/backend/branding/_cog.py
@@ -58,6 +58,8 @@ def extract_event_duration(event: Event) -> str:
     Extract a human-readable, year-agnostic duration string from `event`.
 
     In the case that `event` is a fallback event, resolves to 'Fallback'.
+
+    For 1-day events, only the single date is shown, instead of a period.
     """
     if event.meta.is_fallback:
         return "Fallback"
@@ -66,6 +68,9 @@ def extract_event_duration(event: Event) -> str:
     start_date = event.meta.start_date.strftime(fmt)
     end_date = event.meta.end_date.strftime(fmt)
 
+    if start_date == end_date:
+        return start_date
+
     return f"{start_date} - {end_date}"