22 lines
No EOL
854 B
TypeScript
22 lines
No EOL
854 B
TypeScript
import { getISOWeek, getISODay, subYears, setISOWeek, setISODay, isValid } from 'date-fns';
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export const getWeekNumber = (dateString: string): number => {
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const date = new Date(dateString);
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if (!isValid(date)) {
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throw new Error('Invalid date string provided.');
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}
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return getISOWeek(date);
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};
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export const getSameWeekDayLastYear = (dateString: string): string => {
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const baseDate = new Date(dateString);
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if (!isValid(baseDate)) {
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throw new Error('Invalid date string provided.');
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}
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const originalWeek = getISOWeek(baseDate);
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const originalDayOfWeek = getISODay(baseDate);
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const lastYearDate = subYears(baseDate, 1);
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const dateWithWeekSet = setISOWeek(lastYearDate, originalWeek);
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const finalDate = setISODay(dateWithWeekSet, originalDayOfWeek);
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return finalDate.toISOString().split('T')[0]; // Return as YYYY-MM-DD
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}; |