18 lines
614 B
TypeScript
18 lines
614 B
TypeScript
export default (date: Date): { weekYear: number, weekNum: number } => {
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const tempDate = new Date(date)
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tempDate.setHours(0, 0, 0, 0)
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tempDate.setDate(tempDate.getDate() + 3 - (tempDate.getDay() || 7))
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const firstThursday = new Date(tempDate.getFullYear(), 0, 4)
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firstThursday.setDate(firstThursday.getDate() + 3 - (firstThursday.getDay() || 7))
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const diffInDays = Math.floor((tempDate.getTime() - firstThursday.getTime()) / (24 * 60 * 60 * 1000))
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const weekNum = Math.ceil((diffInDays + 1) / 7)
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return {
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weekYear: weekNum === 53 ? tempDate.getFullYear() + 1 : tempDate.getFullYear(),
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weekNum
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}
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} |