如何计算和检查双周日期 [英] How to calculate and check for a bi-weekly date
本文介绍了如何计算和检查双周日期的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我真的需要您的帮助,
我的分界开始日期为:2016年12月19日,由变量 x定义
Let's say my demarcation start date is: December 19, 2016 as defined by the variable x
我该如何编写JavaScript函数,以便它将根据 x
,并将当前日期与重复日期为 x
的十四天(由变量 y
定义)相比。
How can I write a JavaScript function, such that it will check the present date against x
and the present date against what the recurrence date will be (14) days from x
as defined by the variable y
.
var y = recurrence is every 14 days, thereafter from the date (x) with no end date specified (unlimited)
Ex。
function() {
if (present date == x) { alert(true) }
if (present date == y) { alert(true) }
}
推荐答案
您可以获取开始日期和当前日期之间的天数差,然后检查该数字是否为14的倍数。
You could get the number of days difference between your start date and the current date then check if that number is a multiple of 14.
function treatAsUTC(date) {
var result = new Date(date);
result.setMinutes(result.getMinutes() - result.getTimezoneOffset());
return result;
}
function daysBetween(startDate, endDate) {
var millisecondsPerDay = 24 * 60 * 60 * 1000;
return Math.floor((treatAsUTC(endDate) - treatAsUTC(startDate)) / millisecondsPerDay);
}
var demarcationdate = new Date("2016-12-19"),
today = new Date(),
days = daysBetween(demarcationdate,today),
daystill = 14 - days%14,
rec = days%14==0,
d = new Date();
d.setDate(today.getDate() + daystill);
var nextDate = (d.getDate() + "/" + (d.getMonth() + 1) + "/" + d.getFullYear());
console.log("Days diff = "+days+". Recurs today = "+rec+". Next in "+daystill+" days ("+nextDate.toString()+").");
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