| 1 | import moment from 'moment';
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| 2 |
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| 3 | function getBlankDaysBeforeFirstDay(firstDayOfMonth, firstDayOfWeek) {
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| 4 | const weekDayDiff = firstDayOfMonth.day() - firstDayOfWeek;
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| 5 | return (weekDayDiff + 7) % 7;
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| 6 | }
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| 7 |
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| 8 | export default function getNumberOfCalendarMonthWeeks(
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| 9 | month,
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| 10 | firstDayOfWeek = moment.localeData().firstDayOfWeek(),
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| 11 | ) {
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| 12 | const firstDayOfMonth = month.clone().startOf('month');
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| 13 | const numBlankDays = getBlankDaysBeforeFirstDay(firstDayOfMonth, firstDayOfWeek);
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| 14 | return Math.ceil((numBlankDays + month.daysInMonth()) / 7);
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| 15 | }
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