Javascript: get Monday and Sunday of the previous week

Question

I am using the following script to get Monday (first) and Sunday (last) for the previous week:

var curr = new Date; // get current date
var first = curr.getDate() - curr.getDay() - 6; // Gets day of the month (e.g. 21) - the day of the week (e.g. wednesday = 3) = Sunday (18th) - 6
var last = first + 6; // last day is the first day + 6
var startDate = new Date(curr.setDate(first));
var endDate = new Date(curr.setDate(last));

This works fine if last Monday and Sunday were also in the same month, but I just noticed today that it doesn't work if today is December and last Monday was in November.

I'm a total JS novice, is there another way to get these dates?

RobG · Answer 1 · 2012-12-03T11:21:51.600

You can get the previous Monday by getting the Monday of this week and subtracting 7 days. The Sunday will be one day before that, so:

var d = new Date();

// set to Monday of this week
d.setDate(d.getDate() - (d.getDay() + 6) % 7);

// set to previous Monday
d.setDate(d.getDate() - 7);

// create new date of day before
var sunday = new Date(d.getFullYear(), d.getMonth(), d.getDate() - 1);

For 2012-12-03 I get:

Mon 26 Nov 2012
Sun 25 Nov 2012

Is that what you want?

// Or new date for the following Sunday
var sunday = new Date(d.getFullYear(), d.getMonth(), d.getDate() + 6);

which gives

Sun 02 Dec 2012

In general, you can manipulate date objects by add and subtracting years, months and days. The object will handle negative values automatically, e.g.

var d = new Date(2012,11,0)

Will create a date for 2012-11-30 (noting that months are zero based so 11 is December). Also:

d.setMonth(d.getMonth() - 1); // 2012-10-30

d.setDate(d.getDate() - 30);  // 2012-09-30

Thanks Rob - this looks good - the dates I would need would be Mon 26 nov 2012 and Sun 2 December 2012. — user18577, Dec 03 '12 at 11:14
Good one. Start with good logic, then finish with simple code. Impressive... — Yohannes Kristiawan, Oct 25 '19 at 23:49

hereandnow78 · Accepted Answer · 2012-12-03T11:24:49.503

7

if you dont want to do it with an external library you should work with timestamps. i created a solution where you would substract 60*60*24*7*1000 (which is 604800000, which is 1 week in milliseconds) from the current Date and go from there:

var beforeOneWeek = new Date(new Date().getTime() - 60 * 60 * 24 * 7 * 1000)
  , day = beforeOneWeek.getDay()
  , diffToMonday = beforeOneWeek.getDate() - day + (day === 0 ? -6 : 1)
  , lastMonday = new Date(beforeOneWeek.setDate(diffToMonday))
  , lastSunday = new Date(beforeOneWeek.setDate(diffToMonday + 6));

edited Dec 03 '12 at 11:24

answered Dec 03 '12 at 11:19

hereandnow78

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Does not work in countries that use DST, because one week is not always 60*60*24*7*1000ms. For example at 2014-03-31 00:30:00 in France, lastMonday would be 2014-03-17 even though March 24th and March 31st are Mondays. – personne3000 Feb 22 '14 at 18:17

score 4 · Answer 3 · answered Dec 03 '12 at 11:01

4

You could use a library like moment.js. See the subtract method http://momentjs.com/docs/#/manipulating/subtract/

answered Dec 03 '12 at 11:01

Toni Toni Chopper

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can you explain how, other than just linking to moment? – chovy Dec 27 '15 at 09:16
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moment().day(-6) to get last monday and moment().day(-1) to get last sunday (where monday is the first day of the week and sunday is the last otherwise moment().day(-7) to get last sunday) – Toni Toni Chopper Dec 29 '15 at 08:29

score 3 · Answer 4 · answered Jun 12 '16 at 10:45

3

A few answers mentioned moment, but no one wrote about this simple method:

moment().day(-13) // Monday last week
moment().day(-7) // Sunday last week

.day sets a week day, so it doesn't matter what day is it today, only week matters.

answered Jun 12 '16 at 10:45

Alex Lapa

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So if i run -7 on a monday, then on a tuesday.. wont i end up with two different days? – Angry 84 Jan 31 '17 at 07:04
@Mayhem no, it will always be Sunday, unless it's locale dependant, I don't quite remember. But it definitely doesn't depend on current date, you can test it yourself. – Alex Lapa Feb 01 '17 at 00:31
This is so much easier, love it. – Nicholas Porter Mar 22 '19 at 05:31

score 2 · Answer 5 · answered Jan 29 '20 at 06:03

This is the general solution of find any day of any week.

function getParticularDayTimestamp(lastWeekDay) {
  var currentWeekMonday = new Date().getDate() - new Date().getDay() + 1;
  return new Date().setDate(currentWeekMonday - lastWeekDay);
}

console.log(getParticularDayTimestamp(7)) // for last week monday
console.log(getParticularDayTimestamp(1)) // for last week sunday
console.log(getParticularDayTimestamp(14)) // for last to last week monday
console.log(getParticularDayTimestamp(8)) // for last to last week sunday

score 1 · Answer 6 · answered Jan 21 '16 at 22:53

Using Moment you can do the following

  var lastWeek          = moment().isoWeek(moment().subtract(1,'w').week());
  var mondayDifference  = lastWeek.dayOfYear() - lastWeek.weekday() + 1;
  var sundayDifference  = mondayDifference - 1;

  var lastMonday        = moment().dayOfYear(mondayDifference);
  var lastSunday        = moment().dayOfYear(sundayDifference  );

score 1 · Answer 7 · edited Jun 11 '19 at 18:31

1

it can be this simple.

var today = new Date();
var sunday = new Date(this.today.getFullYear(), this.today.getMonth(), this.today.getDate() - this.today.getDay());

edited Jun 11 '19 at 18:31

Jimmy Kane

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answered Mar 21 '19 at 16:39

WebBuild Tech

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score 0 · Answer 8 · edited May 23 '17 at 11:46

Here you have a multi-purpose function:

 function getThe(numOfWeeks, weekday, tense, fromDate) { 
 // for instance: var lastMonday = getThe(1,"Monday","before",new Date()) 
      var targetWeekday = -1;  
      var dateAdjustment = clone(fromDate);  
      var result = clone(fromDate);

      switch (weekday) {
        case "Monday": targetWeekday = 8; break;
        case "Tuesday": targetWeekday = 2; break;
        case "Wednesday": targetWeekday = 3; break;
        case "Thursday": targetWeekday = 4; break;
        case "Friday": targetWeekday = 5; break;
        case "Saturday": targetWeekday = 6; break;
        case "Sunday": targetWeekday = 7;
      }

      var adjustment = 7 * (numOfWeeks - 1);
      if (tense == "after") adjustment = -7 * numOfWeeks;

      dateAdjustment.setDate(fromDate.getDate() - targetWeekday);
      var weekday = dateAdjustment.getDay();

      result.setDate(fromDate.getDate() - weekday - adjustment);
      result.setHours(0,0,0,0);
      return result;
  }

You can find the "clone(obj)" function in the next post: https://stackoverflow.com/a/728694/6751764

score 0 · Answer 9 · answered Aug 10 '22 at 08:32

You can use a third party date library to deal with dates. For example:

var startOfWeek = moment().startOf('week').toDate();
var endOfWeek   = moment().endOf('week').toDate();

if you want to use JavaScript then use the below code

var curr = new Date; // get current date
      var first = curr.getDate() - curr.getDay()+1; // First day is the day of the month - the day of the week
      var last = first + 6; // last day is the first day + 6
      var startDate = new Date(curr.setDate(first));
      startDate = ""+startDate.getFullYear()+"-"+ (startDate.getMonth() + 1) + "-" + startDate.getDate() 

      var endDate = new Date(curr.setDate(last));
      endDate = "" + (endDate.getMonth() + 1) + "/" + endDate.getDate() + "/" + endDate.getFullYear();
      
       alert(startDate+" ,   "+endDate)

Javascript: get Monday and Sunday of the previous week

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