add to /etc/update-motd.d/99-countdown

countdown-motd.sh

#!/bin/bash

# Tanggal target (ganti dengan tanggal yang diinginkan)
target_date="2024-12-31"

# Hitung mundur sisa hari
current_date=$(date +%Y-%m-%d)
days_left=$(echo $(( ($(date -d "$target_date" +%s) - $(date -d "$current_date" +%s)) / 86400 )))

# Tampilkan pesan MOTD
echo "==============================================="
echo "           COUNTDOWN TO TARGET DATE            "
echo "==============================================="
echo ""
echo "  Target Date: $target_date"
echo "  Days Left   : $days_left"
echo ""
echo "==============================================="