32 lines
846 B
TypeScript
32 lines
846 B
TypeScript
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/**
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* Formats a PocketBase date string into a localized year string or "Present".
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* @throws {Error} if any date is invalid or if the range is logically impossible.
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*/
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export function formatYearRange(start: string, end: string | null): string {
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const startDate = new Date(start);
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if (Number.isNaN(startDate.getTime())) {
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throw new Error('Invalid start date');
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}
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const startYear = startDate.getFullYear();
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if (end === null) {
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return `${startYear} — Present`;
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}
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const endDate = new Date(end);
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if (Number.isNaN(endDate.getTime())) {
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throw new Error('Invalid end date');
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}
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const endYear = endDate.getFullYear();
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if (startYear > endYear) {
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throw new Error('Start year cannot be after end year');
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}
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if (startYear === endYear) {
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return `${startYear}`;
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}
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return `${startYear} — ${endYear}`;
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}
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