如何使用批处理文件在特定时间更改壁纸？

I'm very new to using batch files and programming in cmd. After failing to find a free wallpaper program that would set a specific wallpaper at a specific time, and supported dual monitors, I decided to create a batch file that pulls the time of day (in military format) and uses if statements to set the appropriate wallpaper if it hasn't already been set. Here's a section of the code so far:I'm very new to using batch files and programmi