如何计算和检查双周日期 [英] How to calculate and check for a bi-weekly date

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()+").");

jsFiddle

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