relative static method
e.g. "2 hours ago", "3 days ago", "just now"
Implementation
static String relative(DateTime dateTime) {
final now = DateTime.now();
final diff = now.difference(dateTime);
if (diff.inSeconds < 60) return 'Just now';
if (diff.inMinutes < 60) return '${diff.inMinutes}m ago';
if (diff.inHours < 24) return '${diff.inHours}h ago';
if (diff.inDays < 7) return '${diff.inDays}d ago';
return absolute(dateTime);
}