macOS Mojave dynamic background re-implement as GTK+ background slideshow. Background images are changed to reflect the time of the day.

mojave.xml

<!-- Instructions:
- Download and unzip Mojave dynamic background here: https://files.rb.gd/mojave_dynamic.zip 
- Rename the extracted folder as "mojave-background" (Excuse the trouble but I renamed it on my machine and already use that path in the XML file)
- Save this xml file next to the Mojave background files
- Fix the path to the background images below (better using absolute path)
- Lastly, either: 
  + GNOME: Use gnome-tweaks tool to select this XML as wallpaper (as default wallpaper settings won't let you choose wallpaper from custom path)
  + MATE: Go to background setting (in Appearance) > Choose +Add... > make sure **All files** filter is selected at the bottom right > Then choose mojave.xml
-->
<background>
  <starttime>
    <year>2014</year>
    <month>01</month>
    <day>11</day>
    <hour>0</hour>
    <minute>00</minute>
    <second>00</second>
  </starttime>
  <!-- 00:00 -->
  <static>
    <duration>10795.0</duration>
    <file>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_15.jpeg</file>
  </static>
  <transition type="overlay">
    <duration>5.0</duration>
    <from>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_15.jpeg</from>
    <to>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_16.jpeg</to>
  </transition>
  <!-- 03:00 -->
  <static>
    <duration>10795.0</duration>
    <file>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_16.jpeg</file>
  </static>
  <transition type="overlay">
    <duration>5.0</duration>
    <from>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_16.jpeg</from>
    <to>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_1.jpeg</to>
  </transition>
  <!-- 05:00 -->
  <static>
    <duration>3595.0</duration>
    <file>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_1.jpeg</file>
  </static>
  <transition type="overlay">
    <duration>5.0</duration>
    <from>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_1.jpeg</from>
    <to>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_2.jpeg</to>
  </transition>
  <!-- 06:00 -->
  <static>
    <duration>3595.0</duration>
    <file>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_2.jpeg</file>
  </static>
  <transition type="overlay">
    <duration>5.0</duration>
    <from>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_2.jpeg</from>
    <to>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_3.jpeg</to>
  </transition>
  <!-- 07:00 -->
  <static>
    <duration>3595.0</duration>
    <file>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_3.jpeg</file>
  </static>
  <transition type="overlay">
    <duration>5.0</duration>
    <from>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_3.jpeg</from>
    <to>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_4.jpeg</to>
  </transition>
  <!-- 08:00 -->
  <static>
    <duration>3595.0</duration>
    <file>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_4.jpeg</file>
  </static>
  <transition type="overlay">
    <duration>5.0</duration>
    <from>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_4.jpeg</from>
    <to>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_5.jpeg</to>
  </transition>
  <!-- 09:00 -->
  <static>
    <duration>3595.0</duration>
    <file>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_5.jpeg</file>
  </static>
  <transition type="overlay">
    <duration>5.0</duration>
    <from>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_5.jpeg</from>
    <to>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_6.jpeg</to>
  </transition>
  <!-- 10:00 -->
  <static>
    <duration>3595.0</duration>
    <file>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_6.jpeg</file>
  </static>
  <transition type="overlay">
    <duration>5.0</duration>
    <from>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_6.jpeg</from>
    <to>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_7.jpeg</to>
  </transition>
  <!-- 11:00 -->
  <static>
    <duration>7195.0</duration>
    <file>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_7.jpeg</file>
  </static>
  <transition type="overlay">
    <duration>5.0</duration>
    <from>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_7.jpeg</from>
    <to>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_8.jpeg</to>
  </transition>
  <!-- 13:00 -->
  <static>
    <duration>3595.0</duration>
    <file>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_8.jpeg</file>
  </static>
  <transition type="overlay">
    <duration>5.0</duration>
    <from>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_8.jpeg</from>
    <to>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_9.jpeg</to>
  </transition>
  <!-- 14:00 -->
  <static>
    <duration>3595.0</duration>
    <file>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_9.jpeg</file>
  </static>
  <transition type="overlay">
    <duration>5.0</duration>
    <from>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_9.jpeg</from>
    <to>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_10.jpeg</to>
  </transition>
  <!-- 15:00 -->
  <static>
    <duration>3595.0</duration>
    <file>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_10.jpeg</file>
  </static>
  <transition type="overlay">
    <duration>5.0</duration>
    <from>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_10.jpeg</from>
    <to>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_11.jpeg</to>
  </transition>
  <!-- 16:00 -->
  <static>
    <duration>3595.0</duration>
    <file>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_11.jpeg</file>
  </static>
  <transition type="overlay">
    <duration>5.0</duration>
    <from>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_11.jpeg</from>
    <to>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_12.jpeg</to>
  </transition>
  <!-- 17:00 -->
  <static>
    <duration>3595.0</duration>
    <file>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_12.jpeg</file>
  </static>
  <transition type="overlay">
    <duration>5.0</duration>
    <from>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_12.jpeg</from>
    <to>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_13.jpeg</to>
  </transition>
  <!-- 18:00 -->
  <static>
    <duration>7195.0</duration>
    <file>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_13.jpeg</file>
  </static>
  <transition type="overlay">
    <duration>5.0</duration>
    <from>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_13.jpeg</from>
    <to>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_14.jpeg</to>
  </transition>
  <!-- 20:00 -->
  <static>
    <duration>10795.0</duration>
    <file>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_14.jpeg</file>
  </static>
  <transition type="overlay">
    <duration>5.0</duration>
    <from>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_14.jpeg</from>
    <to>/home/thanh/Pictures/wallpapers/mojave-background/mojave_dynamic_15.jpeg</to>
  </transition>
</background>

There seems to be a mismatch in the timings of the pictures written in the xml. Time starts with 00:00, then fast-forward to 3 hours (10795 seconds), it is 03:00. Then fast-forward 3 more hours (10795 seconds), and it is only 05:00? Shouldn't it be 06:00?

Guys lets hope he write a script to set this up

Here's a tip - everything works much smoother if you just move the jpeg files and the xml file to the top of the /Home/Pictures directory and modify the xml script appropriately, e.g for me lines 20-23:

 <!-- 00:00 -->
  <static>
    <duration>10795.0</duration>
    <file>/home/michaelb7/Pictures/mojave_dynamic_15.jpeg</file>
  </static>

of course all 48 file lines will need ot be changed. You can also use it for your lock screen, which is pretty cool. Use Tweak app to select xml file as before.

Anyone else having issues with smooth transitions? I'm on Ubuntu 20.04, and the pictures just abruptly change from one to another.

Hello dude, thanks fot this guide but I have error with day hour, when is day, the wallpaper is night and when is night, wallpaper is day. How I can fix this inverse hours?

Anyone else having issues with smooth transitions? I'm on Ubuntu 20.04, and the pictures just abruptly change from one to another.

hello @guvarallo, that's because of short transition time (only 5 sec), I edited this script, and added smooth transition. i will upload that script in my GitHub with bunch of other dynamic wallpapers ( here ). Also everyone can easily modify or make new wallpaper scripts with program called "Dynamic Wallpaper Editor", which is preinstalled on Manjaro gnome edition.