JS的Date函数Date方法的相关汇总

涂煌

2023-12-01

一、常用date方法

var myDate = new Date();
myDate.getYear(); //获取当前年份(2位)
myDate.getFullYear(); //获取完整的年份(4位,1970-???)
myDate.getMonth(); //获取当前月份(0-11,0代表1月)
myDate.getDate(); //获取当前日(1-31)
myDate.getDay(); //获取当前星期X(0-6,0代表星期天)
myDate.getTime(); //获取当前时间(从1970.1.1开始的毫秒数)
myDate.getHours(); //获取当前小时数(0-23)
myDate.getMinutes(); //获取当前分钟数(0-59)
myDate.getSeconds(); //获取当前秒数(0-59)
myDate.getMilliseconds(); //获取当前毫秒数(0-999)
myDate.toLocaleDateString(); //获取当前日期
var mytime=myDate.toLocaleTimeString(); //获取当前时间
myDate.toLocaleString( ); //获取日期与时间

二、Date函数

1.获取当前年月日

function getYearDate() {
    let tempDate = null;
    let d = new Date;var year = d.getFullYear();
    let month = (d.getMonth() + 1) >=10? (d.getMonth() + 1) : "0" + (d.getMonth() + 1);
    let date = d.getDate() >=10 ? d.getDate() : "0" + d.getDate();
    return tempDate = year + "-" + month + "-" + date;
}
console.log(getYearDate()); //"2020-09-07"

2.获取当前时间

function getNowTime(){
    let date=new Date();
    return date.getFullYear()+"-"
        +(date.getMonth()+1).toString().padStart(2,"0")+"-"
        +date.getDate().toString().padStart(2,"0")
        +" "+date.getHours().toString().padStart(2,"0")
        +":"+date.getMinutes().toString().padStart(2,"0")
        +":"+date.getSeconds().toString().padStart(2,"0");
}
console.log(getNowTime()); //"2020-09-07 14:19:28"

3.获取给定时间戳的时间

function formatDateTime(timestamp) {
    let date = new Date(timestamp);
    let y = date.getFullYear();
    let m = date.getMonth() + 1;
    m = m < 10 ? ('0' + m) : m;
    let d = date.getDate();
    d = d < 10 ? ('0' + d) : d;
    let h = date.getHours();
    h = h < 10 ? ('0' + h) : h;
    let minute = date.getMinutes();
    let second = date.getSeconds();
    minute = minute < 10 ? ('0' + minute) : minute;
    second = second < 10 ? ('0' + second) : second;
    return y + '-' + m + '-' + d+' '+h+':'+minute+':'+second;
};
console.log(formatDateTime(1599459858000)); //"2020-09-07 14:24:18"

4.获取当前时间前后的时间

function formatDateTime(timestamp) {
    let date = new Date(timestamp);
    let y = date.getFullYear();
    let m = date.getMonth() + 1;
    m = m < 10 ? ('0' + m) : m;
    let d = date.getDate();
    d = d < 10 ? ('0' + d) : d;
    let h = date.getHours();
    h = h < 10 ? ('0' + h) : h;
    let minute = date.getMinutes();
    let second = date.getSeconds();
    minute = minute < 10 ? ('0' + minute) : minute;
    second = second < 10 ? ('0' + second) : second;
    return y + '-' + m + '-' + d+' '+h+':'+minute+':'+second;
};
console.log(formatDateTime(1599459858000)); //"2020-09-07 14:24:18"

5.获取当前年份前后的年份

function formatDateTime(timestamp) {
    let date = new Date(timestamp);
    let y = date.getFullYear();
    let m = date.getMonth() + 1;
    m = m < 10 ? ('0' + m) : m;
    let d = date.getDate();
    d = d < 10 ? ('0' + d) : d;
    let h = date.getHours();
    h = h < 10 ? ('0' + h) : h;
    let minute = date.getMinutes();
    let second = date.getSeconds();
    minute = minute < 10 ? ('0' + minute) : minute;
    second = second < 10 ? ('0' + second) : second;
    return y + '-' + m + '-' + d+' '+h+':'+minute+':'+second;
};
console.log(formatDateTime(1599459858000)); //"2020-09-07 14:24:18"

6.获取当前时间的前一个小时时间

function formatDateTime(timestamp) {
    let date = new Date(timestamp);
    let y = date.getFullYear();
    let m = date.getMonth() + 1;
    m = m < 10 ? ('0' + m) : m;
    let d = date.getDate();
    d = d < 10 ? ('0' + d) : d;
    let h = date.getHours();
    h = h < 10 ? ('0' + h) : h;
    let minute = date.getMinutes();
    let second = date.getSeconds();
    minute = minute < 10 ? ('0' + minute) : minute;
    second = second < 10 ? ('0' + second) : second;
    return y + '-' + m + '-' + d+' '+h+':'+minute+':'+second;
};
console.log(formatDateTime(1599459858000)); //"2020-09-07 14:24:18"

7.将时间分隔符去除

function formatDateTime(timestamp) {
    let date = new Date(timestamp);
    let y = date.getFullYear();
    let m = date.getMonth() + 1;
    m = m < 10 ? ('0' + m) : m;
    let d = date.getDate();
    d = d < 10 ? ('0' + d) : d;
    let h = date.getHours();
    h = h < 10 ? ('0' + h) : h;
    let minute = date.getMinutes();
    let second = date.getSeconds();
    minute = minute < 10 ? ('0' + minute) : minute;
    second = second < 10 ? ('0' + second) : second;
    return y + '-' + m + '-' + d+' '+h+':'+minute+':'+second;
};
console.log(formatDateTime(1599459858000)); //"2020-09-07 14:24:18"

8.开始日期到截至日期的天数

function formatDateTime(timestamp) {
    let date = new Date(timestamp);
    let y = date.getFullYear();
    let m = date.getMonth() + 1;
    m = m < 10 ? ('0' + m) : m;
    let d = date.getDate();
    d = d < 10 ? ('0' + d) : d;
    let h = date.getHours();
    h = h < 10 ? ('0' + h) : h;
    let minute = date.getMinutes();
    let second = date.getSeconds();
    minute = minute < 10 ? ('0' + minute) : minute;
    second = second < 10 ? ('0' + second) : second;
    return y + '-' + m + '-' + d+' '+h+':'+minute+':'+second;
};
console.log(formatDateTime(1599459858000)); //"2020-09-07 14:24:18"

三、方法注意点

1.getYear和getFullYear两种方法返回区别

首先，无论何时都应使用getFullYear来替代getYear方法。

var d=new Date; 
alert(d.getYear())
// =>IE中返回 2021，在Firefox中会返回121
// （2021-1900=121）
alert(d.getFullYear())
// =>IE和FF中都会返回2021

2.getMonth获取月份需要加1

var d=new Date; 
alert(d.getMonth())
// =>返回值0-11