const units: { unit: Intl.RelativeTimeFormatUnit; ms: number }[] = [
{ unit: "year", ms: 31536000000 },
{ unit: "month", ms: 2628000000 },
{ unit: "day", ms: 86400000 },
{ unit: "hour", ms: 3600000 },
{ unit: "minute", ms: 60000 },
{ unit: "second", ms: 1000 },
];
const rtf = new Intl.RelativeTimeFormat("en", { numeric: "auto" });
/**
* Get language-sensitive relative time message from Dates.
* @param relative - the relative dateTime, generally is in the past or future
* @param pivot - the dateTime of reference, generally is the current time
*/
export function relativeTimeFromDates(relative: Date | null, pivot: Date = new Date()): string {
if (!relative) return "";
const elapsed = relative.getTime() - pivot.getTime();
return relativeTimeFromElapsed(elapsed);
}
/**
* Get language-sensitive relative time message from elapsed time.
* @param elapsed - the elapsed time in milliseconds
*/
export function relativeTimeFromElapsed(elapsed: number): string {
for (const { unit, ms } of units) {
if (Math.abs(elapsed) >= ms || unit === "second") {
return rtf.format(Math.round(elapsed / ms), unit);
}
}
return "";
}
const units: { unit: Intl.RelativeTimeFormatUnit; ms: number }[] = [
{ unit: "year", ms: 31536000000 },
{ unit: "month", ms: 2628000000 },
{ unit: "day", ms: 86400000 },
{ unit: "hour", ms: 3600000 },
{ unit: "minute", ms: 60000 },
{ unit: "second", ms: 1000 },
];
const rtf = new Intl.RelativeTimeFormat("en", { numeric: "auto" });
/**
* Get language-sensitive relative time message from Dates.
* @param relative - the relative dateTime, generally is in the past or future
* @param pivot - the dateTime of reference, generally is the current time
*/
export function relativeTimeFromDates(relative: Date | null, pivot: Date = new Date()): string {
if (!relative) return "";
const elapsed = relative.getTime() - pivot.getTime();
return relativeTimeFromElapsed(elapsed);
}
/**
* Get language-sensitive relative time message from elapsed time.
* @param elapsed - the elapsed time in milliseconds
*/
export function relativeTimeFromElapsed(elapsed: number): string {
for (const { unit, ms } of units) {
if (Math.abs(elapsed) >= ms || unit === "second") {
return rtf.format(Math.round(elapsed / ms), unit);
}
}
return "";
}
