Update examples/units.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: bkeepers

examples/units.ts

@@ -1,10 +1,13 @@
 import { getExtremesPrediction } from 'neaps'
 
+const start = new Date()
+const end = new Date(start.getTime() + 24 * 60 * 60 * 1000)
+
 const options = {
   latitude: 22.24,
   longitude: -75.75,
-  start: new Date('2026-01-06T00:00:00Z'),
-  end: new Date('2026-01-07T00:00:00Z')
+  start,
+  end
 }
 
 const inMeters = getExtremesPrediction(options)