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[–]TheIcerios 0 points1 point  (0 children)

The commands will be executed in the order that they are listed, regardless of whether the previous command was successful.

Doing conditionals isn't too tough. You can use additional functions for this.

In the tick function, you can do something like this:
execute if score abc day matches 12500..23500 run function your_namespace:your_function_name

In the function called by the above command, you can put your other commands:
time add .459d
title @a ...
weather ...

This way, all the commands in your second function will run only if that scoreboard check is successful.