I have to two dates from
and to
. I want to get all of the month names between these two dates.
Following is my code
var monthNames = [ "January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November", "December" ];
function diff(from, to) {
var datFrom = new Date('1 ' + from);
var datTo = new Date('1 ' + to);
var arr = monthNames.slice(datFrom.getMonth(), datTo.getMonth() + 1);
}
above code works for following inputs
diff('September 2013', 'December 2013');
but it does not work for this
diff('September 2013', 'February 2014');
How can I make it work?
I have to two dates from
and to
. I want to get all of the month names between these two dates.
Following is my code
var monthNames = [ "January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November", "December" ];
function diff(from, to) {
var datFrom = new Date('1 ' + from);
var datTo = new Date('1 ' + to);
var arr = monthNames.slice(datFrom.getMonth(), datTo.getMonth() + 1);
}
above code works for following inputs
diff('September 2013', 'December 2013');
but it does not work for this
diff('September 2013', 'February 2014');
How can I make it work?
Share Improve this question asked Jan 29, 2014 at 20:22 Om3gaOm3ga 33k45 gold badges149 silver badges230 bronze badges 3-
3
What would you want it to do for
diff('September 2013', 'February 2015')
? – lurker Commented Jan 29, 2014 at 20:24 - I want all the month names between those two dates. – Om3ga Commented Jan 29, 2014 at 20:25
- Do you want duplicated month names was the gist of the question I believe – Dexygen Commented Jan 29, 2014 at 20:36
5 Answers
Reset to default 7Mine is better: http://jsfiddle/kS73f/8/
var monthNames = [ "January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November", "December" ];
function diff(from, to) {
var arr = [];
var datFrom = new Date('1 ' + from);
var datTo = new Date('1 ' + to);
var fromYear = datFrom.getFullYear();
var toYear = datTo.getFullYear();
var diffYear = (12 * (toYear - fromYear)) + datTo.getMonth();
for (var i = datFrom.getMonth(); i <= diffYear; i++) {
arr.push(monthNames[i%12] + " " + Math.floor(fromYear+(i/12)));
}
return arr;
}
console.log(diff('September 2013', 'March 2014'));
You're going to have to do a more manual method than slice. Here's a starting point you can determine how to handle cases as mentioned in ments.
function diff(from, to) {
var result = [];
var datFrom = new Date('1 ' + from);
var datTo = new Date('1 ' + to);
if(datFrom < datTo) {
var month = datFrom.getMonth();
var toMonth = datTo.getMonth() + 1 + ((datTo.getYear() - datFrom.getYear())*12); //toMonth adjusted for year
for(; month < toMonth; month++) { //Slice around the corner...
result.push(monthNames[month % 12]);
}
}
return result;
}
diff('September 2013', 'February 2014'); //=["September", "October", "November", "December", "January", "February"]
var monthNames = [ "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" ];
function diff(from, to) {
var datFrom = new Date('1 ' + from);
var datTo = new Date('1 ' + to);
var arr;
if(datFrom > datTo) {
return diff(to, from);
}
var fromYear = datFrom.getFullYear();
var toYear = datTo.getFullYear();
if(fromYear === toYear) {
return monthNames.slice(datFrom.getMonth(), datTo.getMonth() + 1);
} else {
var arr = addYear(monthNames.slice(datFrom.getMonth(), new Date('1 December ' + fromYear)), fromYear);
for(var i = 1; i < (toYear - fromYear); i++) {
arr = arr.concat(addYear(monthNames, fromYear + i));
}
return arr.concat(addYear(monthNames.slice(new Date('1 January ' + fromYear).getMonth(), datTo.getMonth() + 1), toYear));
}
}
function addYear(arr, year) {
var updatedArr = [];
for(var i = 0; i < arr.length; i++) {
updatedArr[i] = arr[i] + ' ' + year;
}
return updatedArr;
}
Than try console.log(diff('September 2013', 'February 2015'))
to test it.
The following modifies the original function as little as possible, if that helps the OP from a prehension standpoint.
function diff(from, to) {
var datFrom = new Date('1 ' + from);
var datTo = new Date('1 ' + to);
var arr = monthNames.slice(datFrom.getMonth(), datTo.getMonth() + 1);
if (!arr.length) {
arr = monthNames.slice(datFrom.getMonth(), 12);
arr = arr.concat(monthNames.slice(0, datTo.getMonth() + 1));
}
return arr;
}
console.log(diff('December 2013', 'February 2014')); //["September", "October", "November", "December", "January", "February"]
Lazy answer:
var monthNames = [ "January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November", "December",
"January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November", "December" ];
function diff(from, to) {
var mFrom = new Date('1 ' + from).getMonth();
var mTo = new Date('1 ' + to).getMonth();
mTo = mTo < mFrom ? mTo + 12 : mTo;
return monthNames.slice(mFrom, mTo + 1);
}
alert(diff('September 2013', 'December 2013'));
alert(diff('September 2013', 'February 2014'));