在javascript中查找上个月的第一天 [英] Find first day of previous month in javascript

问题描述

给定日期对象，如何在javascript中获取上个月的第一天

Given a date object, how to get its previous month's first day in javascript

推荐答案

function firstDayInPreviousMonth(yourDate) {
    var d = new Date(yourDate);
    d.setDate(1);
    d.setMonth(d.getMonth() - 1);
    return d;
}

编辑：好吧......我肯定在这里学到了一些东西。我认为这是涵盖所有情况的最简单的解决方案（是的，它适用于1月）：

Alright... I've definitely learned something here. I think that this is the simplest solution that covers all cases (and yes, it does work for January):

function firstDayInPreviousMonth(yourDate) {
    return new Date(yourDate.getFullYear(), yourDate.getMonth() - 1, 1);
}

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