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/**
Takes a relative date and an optional date parameter, and returns a human-readable string representing the difference between the two dates.
@function
@param {number|Date} relativeDate - The relative date (can be a number
representing an UTC timestamp, or a Date object).
@param {Date} [date=new Date()] - An optional date parameter to compare the
relative date to. Defaults to the current date and time.
@returns {string} A human-readable string representing the difference between
the two dates (e.g., "in 3 months", "5 hours ago", etc.). Returns "-" if the input date is invalid or not yet loaded.
@example
const timestamp = Date.now() / 1000 + 60 * 60 * 24 * 3; // UTC timestamp 3 days from now
console.log(getRelativeTime(timestamp)); // Output: "in 3 days"
*/
export const getRelativeTime = (relativeDate, date = new Date()) => {
// if relativeDate is a number, we assume it is an UTC timestamp
if (typeof relativeDate === 'number') {
// count charachters to check if in seconds or milliseconds
if (relativeDate.toString().length < 13) {
relativeDate = relativeDate * 1000;
}
// convert to date object
relativeDate = new Date(relativeDate);
}
if (!(relativeDate instanceof Date)) {
// invalid date, probably still loading
return '-';
}
let units = {
year : 24 * 60 * 60 * 1000 * 365,
month : 24 * 60 * 60 * 1000 * 365/12,
day : 24 * 60 * 60 * 1000,
hour : 60 * 60 * 1000,
minute: 60 * 1000,
second: 1000
}
let rtf = new Intl.RelativeTimeFormat('en', { numeric: 'auto' })
let elapsed = relativeDate - date
// "Math.abs" accounts for both "past" & "future" scenarios
for (let u in units) {
if (Math.abs(elapsed) > units[u] || u === 'second') {
return rtf.format(Math.round(elapsed/units[u]), u)
}
}
}