如何获取从过去日期到现在的月份和年份JavaScript

Question

我正试图弄清楚如何从过去的日期到现在获得年和月的组合。

比方说，过去的日期是

const date = "December 2019"

然后我需要一个阵列

const arrayOfMonths = [ "April 2020", "March 2020", "February 2020", "January 2020", "December 2019"]

Answer 1

您可以使用JavaScriptDate对象和while循环。

只需从当前月份减去一个月，直到你到达你想要的日期。

这样的东西应该行得通。

https://jsfiddle.net/wsf61jpk/5/

var date="December 2018";
var result=[];
//set both start and end date to first date of the month
const end_date = new Date(date.replace(" ", " ,1 "));
const start_date = new Date(new Date().getFullYear(), new Date().getMonth(), 1);

while(end_date<=start_date){
result.push(start_date.toLocaleString('default', { month: 'long' , year: 'numeric'}));
start_date.setMonth(start_date.getMonth() - 1);
}
console.log(result);

Answer 2

我利用javascript日期函数

var oldDate = "December 2019";
var old = new Date(Date.parse(oldDate));
var today = new Date();
var yearsCount= today.getFullYear() - old.getFullYear();
var monthsArr = [];
for(var i = 0; i<=yearsCount;i++){
for(var j = 0; j<12;j++){
//skipping the months before the month in old date and the after the month in the current day
if(i==0 && j<old.getMonth()) continue;
if(i==yearsCount && j>today.getMonth()) continue;
// creating a new date in the format : mm-dd-yyyy (with dd=01) 
var newDate = new Date((j+1)+"-01-"+(old.getFullYear()+i))
//using to localestring to transfrom the date created into format : month year
var newmonth = newDate.toLocaleString('default', { month: 'long',year:'numeric' });
//pushing to the array
monthsArr.push(newmonth);
}
}
console.log(monthsArr);

还有改进的余地，但它完成了任务

Answer 3

此函数生成月份和年份的列表，如您提供的示例所示。请注意，输入需要格式为MONTH FULLYEAR的字符串，而任何其他格式的字符串很可能会产生错误的结果。话虽如此，如果可能的话，我建议传递Date对象或时间戳

function generateMonthsAndYears(startingFromDateString) {
const cur = new Date(`15 ${startingFromDateString}`)
const untilDateString = new Date(new Date().getFullYear(), new Date().getMonth()+1, 15).toDateString();
const result = [];
for(; untilDateString !== cur.toDateString(); cur.setMonth(cur.getMonth()+1))
result.push(cur.toLocaleString('en-us', { month: 'long', year: 'numeric' }))
return result;
}
console.log(generateMonthsAndYears("December 2018"))