lib get-closing-period-start-date.ts

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  import { dayjs } from '@amalia/ext/dayjs';
import { type WorkflowDefinition } from '@amalia/payout-collaboration/workflows/types';

export const getClosingPeriodStartDate = (
  periodStartTimestamp: number,
  closingPeriodStartTimeframe: WorkflowDefinition['closingStartProps'],
) => {
  if (!closingPeriodStartTimeframe) {
    return null;
  }

  const periodStartDate = dayjs.utc(periodStartTimestamp, 'X');

  const dateForecastWithMonthAdded = periodStartDate.utc().add(closingPeriodStartTimeframe.months, 'month');

  const numberOfDaysInMonth = dateForecastWithMonthAdded.daysInMonth();

  const forecastedStartDate =
    closingPeriodStartTimeframe.days >= numberOfDaysInMonth
      ? dateForecastWithMonthAdded.utc().endOf('month').startOf('day')
      : dateForecastWithMonthAdded.utc().add(closingPeriodStartTimeframe.days, 'days');

  return forecastedStartDate.utc().toDate();
};