All files / src/date-range-picker/utils day-offset.js

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/**
 *
 * @param {string} firstDayOfWeek
 *
 * @returns {number} - 0 | 1 | 2 | 3 | 4 | 5 | 6
 */
export const dayOffset = firstDayOfWeek =>
  [
    "sunday",
    "monday",
    "tuesday",
    "wednesday",
    "thursday",
    "friday",
    "saturday"
  ].indexOf(firstDayOfWeek.toLocaleLowerCase(window.__locale__))