Remove tmux sessions older than a specific date

rm_tmux.sh

#!/bin/bash

# Usage: ./rm_tmux.sh 2020-01-01
tmux ls | tr -d '()' |  awk -v dateA=$1 '{
        cmd ="date \"+%Y-%m-%d\" -d \""$6" "$7" "$8" "$9"\""
        cmd | getline dd
        if (FNR>1 && dd<=dateA) {
                print $1
        }
        close(cmd)
}' | tr -d ':' | while read line
do
        echo "killing $line"
        tmux kill-session -t $line
done