如何在javascript中获取最后一小时,上个月和昨天？

Question

我试图从当前日期和时间到最后一个小时,上个月和昨天,我使用Date()对象来获取当前日期和时间:

function fetchCurrentDateTime() {
    var currentDateobj = new Date()
    var Day = currentDateobj.getDate()
    var Hour = currentDateobj.getHours()
    var Month = 1+(currentDateobj.getMonth())
    var Year = currentDateobj.getFullYear()
    console.log('Today is:', Day+'-'+Month+'-'+Year);
    console.log('yesterday was:', Day-1+'-'+Month+'-'+Year);
    console.log('Its', Hour, 'hrs');
    console.log('It was', Hour-1, 'an Hour back.');
    console.log('This is:', Month, 'Month');
    console.log('It was', Month-1, 'Month, a month ago.');
    console.log('It is', Year);
    }

我想要一个函数,它不仅可以返回日期或时间,还可以返回完整的日期时间,如:

Today: '2013-05-21 10:06:22'
Yesterday: '2013-05-20 10:06:22'
Current Hour: '2013-05-21 10:06:22'
Last Hour: '2013-05-21 09:06:22'
Current Month: '2013-05-21 10:06:22'
Last Month: '2013-04-21 10:06:22'

我还想问一下,如果是00:00:00小时,那么最后一小时会有什么结果呢？与月份和日期相同.

Answer 1

var today = new Date();
var yesterday = new Date(today.getTime() - (1000*60*60*24));
var hourago = new Date(today.getTime() - (1000*60*60));

console.log(today);
console.log(yesterday);
console.log(hourago);

getTime()返回Date对象的时间戳.然后,您可以减去适当的毫秒数,并从该数字中创建一个新对象.如果需要,您现在可以按照您希望的方式格式化日期.