yee

.config/niri/backgrounds/f43.xml

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+<background>
+  <starttime>
+    <year>2025</year>
+    <month>10</month>
+    <day>28</day>
+    <hour>8</hour>
+    <minute>00</minute>
+    <second>00</second>
+  </starttime>
+<!-- This animation will start at 8 AM. -->
+
+<!-- We start with day at 8 AM. It will remain up for 10 hours. -->
+<static>
+<duration>36000.0</duration>
+<file>/usr/share/backgrounds/f43/default/f43-01-day.jxl</file>
+</static>
+
+<!-- Day ended and starts to transition to night at 6 PM. The transition lasts for 2 hours, ending at 8 PM. -->
+<transition type="overlay">
+<duration>7200.0</duration>
+<from>/usr/share/backgrounds/f43/default/f43-01-day.jxl</from>
+<to>/usr/share/backgrounds/f43/default/f43-01-night.jxl</to>
+</transition>
+
+<!-- It's 8 PM, we're showing the night till 6 AM. -->
+<static>
+<duration>36000.0</duration>
+<file>/usr/share/backgrounds/f43/default/f43-01-night.jxl</file>
+</static>
+
+<!-- It's 6 AM, and we're starting to transition to day. Transition completes at 8 AM. -->
+<transition type="overlay">
+<duration>7200.0</duration>
+<from>/usr/share/backgrounds/f43/default/f43-01-night.jxl</from>
+<to>/usr/share/backgrounds/f43/default/f43-01-day.jxl</to>
+</transition>
+
+</background>