9b5c1f64ba
The correspondence timeline labels each row with its distance from today
("vor 86 Jahren"). Uses calendar-field math so the anniversary day
flips exactly — an ms-based 365.25d average misses by a day on leap
years. Invalid / future dates return "" so the caller can hide the
label rather than print "vor 0 Jahren".
Refs #305
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
31 lines
1.6 KiB
TypeScript
31 lines
1.6 KiB
TypeScript
import * as m from '$lib/paraglide/messages.js';
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export function relativeTimeDe(from: Date, now: Date = new Date()): string {
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const minutes = Math.round((now.getTime() - from.getTime()) / 60_000);
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// Malformed input (e.g. Invalid Date from a broken backend string) must not
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// crash the dashboard — fall back to "0 Minuten" rather than render NaN.
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if (!Number.isFinite(minutes)) return m.comment_time_minutes({ count: 0 });
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if (minutes < 60) return m.comment_time_minutes({ count: minutes });
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if (minutes < 1440) return m.comment_time_hours({ count: Math.round(minutes / 60) });
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return m.comment_time_days({ count: Math.round(minutes / 1440) });
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}
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// "vor N Jahren" for a historical letter date relative to now. Computed from
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// calendar fields (not a constant ms-per-year) so that a letter from exactly
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// one year ago reports "vor 1 Jahr" rather than falling on the wrong side of
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// a leap-year rounding. Returns "" for invalid or future dates — the caller
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// should then hide the relative-time label rather than render a misleading
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// "vor 0 Jahren".
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export function relativeYearsDe(from: Date, now: Date = new Date()): string {
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if (Number.isNaN(from.getTime()) || Number.isNaN(now.getTime())) return '';
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if (from.getTime() > now.getTime()) return '';
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let years = now.getUTCFullYear() - from.getUTCFullYear();
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const beforeAnniversary =
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now.getUTCMonth() < from.getUTCMonth() ||
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(now.getUTCMonth() === from.getUTCMonth() && now.getUTCDate() < from.getUTCDate());
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if (beforeAnniversary) years -= 1;
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if (years < 1) return 'vor weniger als 1 Jahr';
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if (years === 1) return 'vor 1 Jahr';
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return `vor ${years} Jahren`;
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}
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