Decrement the date by one day using javascript for loop? - javascript

$(document).ready(function() {
var date = new Date();
var data_new = [];var url ='http://www.domain.com /kjdshlka/api.php?date=2014-07-15';
$.getJSON(url,function(result) {
var elt = [date,result.requests];data_new.push(elt);console.log(data_new);
});
});
I am struggling to decrement the date by one day using javascript for loop.Here is my code,from the url im getting some requests.like if i decrease the date by one day other requests will come .Now i need this process for 7days using javascript for loop.Can anybody please tel me how to do ?

var date = new Date(); // Date you want, here I got the current date and time
date.setDate(date.getDate()-1);
getDate() will give you the date, then reduce it by 1 and using setDate() you can replace date again.

var today = new Date();
var yesterday = new Date(today.getTime() - (24 * 60 * 60 * 1000)); //(hours * minutes * seconds * milliseconds)
console.log(yesterday);

var now = new Date();
console.log(now);
var yesterday = new Date(now - 86400000);
console.log(yesterday);
/* In a Decrement Loop*/
for(var i=100;i>0;i--){
console.log(new Date(now - i*86400000));
}

Related

How to get date after n number of days in a date range?

Suppose I have a start date which is 3/Sep/2019 and end date 10/Sep/2019.
I want to get the date after 4 days from the starting date. So if my starting date is 3/sep/2019 I want to get 7/Sep/2019 but not 12/sep/2019 since this date comes after my end date.
How can I achieve this?
So far I'm getting dates after n number of dates like this:
var days = 7;
var date = new Date();
var res = date.setTime(date.getTime() + days * 24 * 60 * 60 * 1000);
date = new Date(res);
alert(date);
var days = 7;
var date = new Date();
var res = date.setDate(date.getDate() + days);
This is how you get a day 7 days after the date you already have. It wraps to the next month when appropriate as well.
Try the function I wrote below:
function getFutureDate(daysAhead) {
const date = new Date();
date.setDate(date.getDate() + daysAhead);
return date
}
const fourDays = getFutureDate(4)
console.log(fourDays)

how to use Date.toLocaleString() with changing timezones

I converted my start and end date to .ToLocalString and now I am trying to use math.abs to calculate difference between start and end date in numbers but its Value is NaN. Any suggestions on how to apply Math.abs in this situation are appreciated.
Note: Start date will be in EDT and EndDate will be in EST. But they
might or might not be in same timezone.
var startDate1 = new Date(homeCtrl.createStartDate);
var startDate = startDate1.toLocaleString();
var endDate1 = new Date(homeCtrl.createEndDate);
var endDate = endDate1.toLocaleString();
var timeDiff = Math.abs(endDate - startDate); //This is NaN
var diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24)); // Here it will add 1 extra day. Example: 11/06/2018 - 11/04/2018 = 2 days but this gives 3days are timezone change on 11/04/2018 and thats the issue.
I would use the unix timestamp.
var startDate1 = new Date(homeCtrl.createStartDate);
var startDate = startDate1.getTime();
var endDate1 = new Date(homeCtrl.createEndDate);
var endDate = endDate1.getTime();
var timeDiff = Math.abs(endDate - startDate);

Javascript - Find out if date is between two dates, ignoring year

I need to find out if my date is between two dates (for checking birthday whether its between +/- 10 days of current date) without taking care of year (because for birthday we don't need year).
I have tried the following but its typical match and will not ignore year. If i ll compare only date and month then overlap on month end makes problems.
(moment(new Date()).isBetween(moment(date).add(10, 'days'), moment(date).subtract(10, 'days')));
Here is the solution that i was end up with.
const birthDate= new Date(birthDate);
birthDate.setFullYear(new Date().getFullYear());
const isBirthdayAround = Math.abs(birthday - new Date) < 10*24*60*60*1000;
And if you are using moment then:
const birthDate= new Date(birthDate);
birthDate.setFullYear(new Date().getFullYear());
const isBirthdayAround = moment(new Date()).isBetween(moment(birthDate).subtract(10, 'days'), moment(birthDate).add(10, 'days'));
if(Math.abs(birthday - new Date) < 10/*d*/ * 24/*h*/ * 60/*min*/ * 60/*secs*/ * 1000/*ms*/)
alert("somewhat in the range");
You can just work with dates as if they were milliseconds. Just get the difference by subtracting them, then check if its smaller than 10 days in milliseconds.
You can use momentjs with methods subtract and add to find any date you want.
Example:
moment().add(7, 'days'); // next 7 days
moment().subtract(7, 'days'); // 7 days ago
This may be help you.
var birthDate = new Date("05/16/1993");
var day = birthDate.getDate();
var month = birthDate.getMonth();
var currentDate = new Date();
var tempDate = new Date();
var oneDay = 1000 * 60 * 60 * 24
var dayDifference = 10 // you can set here difference
tempDate = new Date(tempDate.setMonth(month,day))
var timeDiff = tempDate.getTime() - currentDate.getTime();
timeDiff = Math.round(timeDiff / oneDay)
if(-dayDifference <= timeDiff && timeDiff <=dayDifference){
alert("matched")
}
else{
alert("not matched")
}

JavaScript, get date of the next day [duplicate]

This question already has answers here:
Incrementing a date in JavaScript
(19 answers)
Closed 8 years ago.
I have the following script which returns the next day:
function today(i)
{
var today = new Date();
var dd = today.getDate()+1;
var mm = today.getMonth()+1;
var yyyy = today.getFullYear();
today = dd+'/'+mm+'/'+yyyy;
return today;
}
By using this:
today.getDate()+1;
I am getting the next day of the month (for example today would get 16).
My problem is that this could be on the last day of the month, and therefore end up returning 32/4/2014
Is there a way I can get the guaranteed correct date for the next day?
You can use:
var tomorrow = new Date();
tomorrow.setDate(tomorrow.getDate()+1);
For example, since there are 30 days in April, the following code will output May 1:
var day = new Date('Apr 30, 2000');
console.log(day); // Apr 30 2000
var nextDay = new Date(day);
nextDay.setDate(day.getDate() + 1);
console.log(nextDay); // May 01 2000
See fiddle.
Copy-pasted from here:
Incrementing a date in JavaScript
Three options for you:
Using just JavaScript's Date object (no libraries):
var today = new Date();
var tomorrow = new Date(today.getTime() + (24 * 60 * 60 * 1000));
One-liner
const tomorrow = new Date(new Date().getTime() + (24 * 60 * 60 * 1000));
Or if you don't mind changing the date in place (rather than creating
a new date):
var dt = new Date();
dt.setTime(dt.getTime() + (24 * 60 * 60 * 1000));
Edit: See also Jigar's answer and David's comment below: var tomorrow
= new Date(); tomorrow.setDate(tomorrow.getDate() + 1);
Using MomentJS:
var today = moment();
var tomorrow = moment(today).add(1, 'days');
(Beware that add modifies the instance you call it on, rather than
returning a new instance, so today.add(1, 'days') would modify today.
That's why we start with a cloning op on var tomorrow = ....)
Using DateJS, but it hasn't been updated in a long time:
var today = new Date(); // Or Date.today()
var tomorrow = today.add(1).day();
Using Date object guarantees that. For eg if you try to create April 31st :
new Date(2014,3,31) // Thu May 01 2014 00:00:00
Please note that it's zero indexed, so Jan. is 0, Feb. is 1 etc.

Efficiently create Javascript Date from Today -1 Years (time) in Unix time

I currently am using this to create a Unix time stamp for time (now) -1 year's time.
Can someone please share a better and more efficient way to do this?
var currentDate = new Date();
var currentYear = currentDate.getFullYear();
var lastYear = parseInt(currentYear) - 1;
var lastYearDateObj = new Date(lastYear, currentDate.getMonth(), currentDate.getDate(), currentDate.getHours(), currentDate.getMinutes());
var lastYearTime = lastYearDateObj.getTime() / 1000;
Thank you!
I don't understand what your division by 1000 is about. You can add it to the end if you like:
var date = new Date();
date.setFullYear(date.getFullYear() - 1);
// date.getTime() / 1000 // if you want.

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