app/lib/utils.ts


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export function formatDuration(months: number): string {
  const years = Math.floor(months / 12);
  const m = months % 12;
  if (years === 0) return `${m}ヶ月`;
  if (m === 0) return `${years}年`;
  return `${years}年${m}ヶ月`;
}