Function previousPeriod

apps/api/src/agents/tools/helpers.ts:236–244

(startDate: string, endDate: string)

 * Compute the immediately-preceding period given a (start, end) range.
 */
export function previousPeriod(startDate: string, endDate: string) {
  const start = new Date(startDate).getTime();
  const end = new Date(endDate).getTime();
  const span = end - start;
  return {
    startDate: new Date(start - span - 86_400_000).toISOString().slice(0, 10),
    endDate: new Date(start - 86_400_000).toISOString().slice(0, 10),
  };
}

/**
 * Build a clickable dashboard URL for a tool result.