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export function toIso8601Full(date: Date): string {
const yearN = date.getFullYear();
const isNegativeYear = yearN <= 0;
const year = isNegativeYear ? pad(1 - yearN, 6) : pad(yearN, 6);
const signedYear = (isNegativeYear ? "-" : "+") + year;
const month = pad(date.getMonth() + 1);
const day = pad(date.getDate());
const hour = pad(date.getHours());
const minute = pad(date.getMinutes());
const second = pad(date.getSeconds());
const ms = pad(date.getMilliseconds(), 3);
const dateString =
`${signedYear}-${month}-${day}T${hour}:${minute}:${second}.${ms}`;
const tzOffset = -date.getTimezoneOffset();
if (tzOffset === 0) {
return `${dateString}Z`;
} else {
const offsetSign = tzOffset > 0 ? "+" : "-";
const offsetHours = pad(Math.floor(Math.abs(tzOffset) / 60));
const offsetMinutes = pad(Math.abs(tzOffset) % 60);
return `${dateString}${offsetSign}${offsetHours}:${offsetMinutes}`;
}
}
export function toIso8601FullUTC(date: Date): string {
const yearN = date.getUTCFullYear();
const isNegativeYear = yearN <= 0;
const year = isNegativeYear ? pad(1 - yearN, 6) : pad(yearN, 6);
const signedYear = (isNegativeYear ? "-" : "+") + year;
const month = pad(date.getUTCMonth() + 1);
const day = pad(date.getUTCDate());
const hour = pad(date.getUTCHours());
const minute = pad(date.getUTCMinutes());
const second = pad(date.getUTCSeconds());
const ms = pad(date.getUTCMilliseconds(), 3);
return `${signedYear}-${month}-${day}T${hour}:${minute}:${second}.${ms}Z`;
}
const pad = (num: number, len = 2) => String(Math.abs(num)).padStart(len, "0");
export function getRelativeTimeUnit(
date: Date,
now: Date = new Date(),
): Parameters<Intl.RelativeTimeFormat["format"]> {
const diffMs = date.getTime() - now.getTime();
const seconds = diffMs / 1000;
const minutes = seconds / 60;
const hours = minutes / 60;
const days = hours / 24;
const weeks = days / 7;
const months = days / 30;
const quarters = months / 3;
const years = days / 365;
if (Math.abs(years) >= 1) return [Math.round(years), "year"];
if (Math.abs(quarters) >= 1) return [Math.round(quarters), "quarter"];
if (Math.abs(months) >= 1) return [Math.round(months), "month"];
if (Math.abs(weeks) >= 1) return [Math.round(weeks), "week"];
if (Math.abs(days) >= 1) return [Math.round(days), "day"];
if (Math.abs(hours) >= 1) return [Math.round(hours), "hour"];
if (Math.abs(minutes) >= 1) return [Math.round(minutes), "minute"];
return [Math.round(seconds), "second"];
}
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