Change photo with every hour automatically

Hi!

First you need the current hour as a number (so for example at 22:54 it would return 22). In Javascript, you can simply call

var currentTime = new Date().getHours();

Then, make an array of textures to pick from, and use that 'currentTime' variable as the index:

var currentTexture = script.textures[currentTime];

And then to set the texture to an Image Component, use:

script.image.mainPass.baseTex = currentTexture;

Here's the full code including the inputs to use in the Inspector:

//@input Component.Image image // select the Image Component to display the texture on
//@input Asset.Texture[] textures // place all your textures here, in order

var currentTime = new Date().getHours(); // this will be a whole number ranging from 0-23, depending on the time of day
var currentTexture = script.textures[currentTime]; // this gets the current texture based on the hour
script.image.mainPass.baseTex = currentTexture; // this applies the current texture to the image component

And this is a screenshot of that script (taken at 22:51 my time), so only the 22nd texture has to be filled to see it in the preview:

Yeah! The new Date() class has many options, you can see all of them on this page!
For example, for the current minute of the hour, use

var currentMinute = new Date().getMinutes()

Which you could then use, for example, to check if it's between 0-30 or 30-60

if(currentMinute < 30){
    // first half of this hour    
}else{
    // second half of this hour
}

If you want a lot of time slots at specific dates, this method would get a bit annoying to work with.
In that case, I'd advice making a table of epoch times of all the time points you have!
Epoch times are timezone-independent, it is the amount of milliseconds since January 1st, 1970, 00:00:00UTC.
So it gives you a really long number, like '1649368198' (this is the time as I'm currently writing this).
If you use Date.now(), you get the time in epoch format, so checking if another epoch time is in the past or in the future is just a matter of checking if it is lesser or greater than it!
You can use this website to convert 'human readable' times to epoch format.

Hope this helps!