This filters out the list of files/directories in the given window. More details in: https://github.com/VagueCoder/Random-Go-Snippets/

filesFilteredByTimeWindow.go

package main

import (
	"fmt"
	"io/ioutil"
	"time"
)

func main() {
	// Not handling any errors since just demonstration
	start, _ := time.Parse("02-Jan-2006 15:04:05 MST", "12-May-2021 17:00:00 IST")
	end, _ := time.Parse("02-Jan-2006 15:04:05 MST", "12-May-2021 18:00:00 IST")
	files, _ := ioutil.ReadDir("folder")
	for _, file := range files {
		modifiedTime := file.ModTime()
		if modifiedTime.After(start) && modifiedTime.Before(end) {
			// Better to store the file instead of printing the filename
			fmt.Println(file.Name())
		}
	}
}