Format the relative date
importance: 4
Write a function formatDate(date) that should format date as follows:
- If since
datepassed less than 1 second, then"right now". - Otherwise, if since
datepassed less than 1 minute, then"n sec. ago". - Otherwise, if less than an hour, then
"m min. ago". - Otherwise, the full date in the format
"DD.MM.YY HH:mm". That is:"day.month.year hours:minutes", all in 2-digit format, e.g.31.12.16 10:00.
For instance:
alert( formatDate(new Date(new Date - 1)) ); // "right now"
alert( formatDate(new Date(new Date - 30 * 1000)) ); // "30 sec. ago"
alert( formatDate(new Date(new Date - 5 * 60 * 1000)) ); // "5 min. ago"
// yesterday's date like 31.12.16 20:00
alert( formatDate(new Date(new Date - 86400 * 1000)) );To get the time from date till now – let’s substract the dates.
function formatDate(date) {
let diff = new Date() - date; // the difference in milliseconds
if (diff < 1000) { // less than 1 second
return 'right now';
}
let sec = Math.floor(diff / 1000); // convert diff to seconds
if (sec < 60) {
return sec + ' sec. ago';
}
let min = Math.floor(diff / 60000); // convert diff to minutes
if (min < 60) {
return min + ' min. ago';
}
// format the date
// add leading zeroes to single-digit day/month/hours/minutes
let d = date;
d = [
'0' + d.getDate(),
'0' + (d.getMonth() + 1),
'' + d.getFullYear(),
'0' + d.getHours(),
'0' + d.getMinutes()
].map(component => component.slice(-2)); // take last 2 digits of every component
// join the components into date
return d.slice(0, 3).join('.') + ' ' + d.slice(3).join(':');
}
alert( formatDate(new Date(new Date - 1)) ); // "right now"
alert( formatDate(new Date(new Date - 30 * 1000)) ); // "30 sec. ago"
alert( formatDate(new Date(new Date - 5 * 60 * 1000)) ); // "5 min. ago"
// yesterday's date like 31.12.2016 20:00
alert( formatDate(new Date(new Date - 86400 * 1000)) );Alternative solution:
function formatDate(date) {
let dayOfMonth = date.getDate();
let month = date.getMonth() + 1;
let year = date.getFullYear();
let hour = date.getHours();
let minutes = date.getMinutes();
let diffMs = new Date() - date;
let diffSec = Math.round(diffMs / 1000);
let diffMin = diffSec / 60;
let diffHour = diffMin / 60;
// formatting
year = year.toString().slice(-2);
month = month < 10 ? '0' + month : month;
dayOfMonth = dayOfMonth < 10 ? '0' + dayOfMonth : dayOfMonth;
hour = hour < 10 ? '0' + hour : hour;
minutes = minutes < 10 ? '0' + minutes : minutes;
if (diffSec < 1) {
return 'right now';
} else if (diffMin < 1) {
return `${diffSec} sec. ago`
} else if (diffHour < 1) {
return `${diffMin} min. ago`
} else {
return `${dayOfMonth}.${month}.${year} ${hour}:${minutes}`
}
}