res += hours + "h ";
if (days == 0 && minutes > 0)
res += (hours > 0 ? padDigits(minutes) + "m " : minutes + ":");
if (days == 0 && hours == 0)
res += hours + "h ";
if (days == 0 && minutes > 0)
res += (hours > 0 ? padDigits(minutes) + "m " : minutes + ":");
if (days == 0 && hours == 0)