function yearToDay(time) {
var y = time.getFullYear(),
m = time.getMonth() 1,
d = time.getDate();
m = m < 10 ? "0" m : m;
d = d < 10 ? "0" d : d;
return y "-" m "-" d;
};
//2022-03-31
function yearToSecond(time) {
var h = time.getHours(),
i = time.getMinutes(),
s = time.getSeconds(),
h = h < 10 ? "0" h : h;
i = i < 10 ? "0" i : i;
s = s < 10 ? "0" s : s;
return yearToDay(time) ' ' h ':' i ':' s;
};
//2022-03-31 10:15:20
function yearToZero(){
return yearToDay(time) " 00:00:00"
}
//2022-03-31 00:00:00
let curDate = new Date()
var preDate = new Date(curDate.getTime() - 24*60*60*1000); //前一天
var nextDate = new Date(curDate.getTime() 24*60*60*1000);//后一天
console.log(yearToSecond(preDate))//前一天
console.log(yearToSecond(nextDate))//后一天
//2022-03-30 10:15:20
//2022-04-01 10:15:20
function getCurDay(){
let nowdays = new Date(),
year = nowdays.getFullYear(),
month = nowdays.getMonth() 1;
month = month > 9 ? month : "0" month;
let firstDayOfCurMonth = `${year}-${month}-01`,
lastDay = new Date(year, month, 0),
lastDayOfCurMonth = `${year}-${month}-${lastDay.getDate()}`;
return [firstDayOfCurMonth,lastDayOfCurMonth]
};
//['2022-03-01','2022-03-31']
function getPreDay() {
let nowdays = new Date(),
year = nowdays.getFullYear(),
month = nowdays.getMonth();
if (month == 0) {
month = 12;
year = year - 1;
}
month = month > 9 ? month : "0" month;
let firstDayOfPreMonth = `${year}-${month}-01`,
lastDay = new Date(year, month, 0),
lastDayOfPreMonth = `${year}-${month}-${lastDay.getDate()}`
return [firstDayOfPreMonth,lastDayOfPreMonth]
};
//['2022-02-01', '2022-02-28']
function getLast3Month() {
var now = new Date(),
year = now.getFullYear(),
month = now.getMonth() 1,
day = now.getDate(),
dateObj = {};
month = month > 9 ? month : "0" month;
day = day > 9 ? day : "0" day;
dateObj.now = year '-' month '-' day;
if (parseInt(month) == 1) {//如果是1月份，则取上一年的10月份
dateObj.last = (parseInt(year) - 1) '-10-' day;
return dateObj;
}
if (parseInt(month) == 2) {//如果是2月份，则取上一年的11月份
dateObj.last = (parseInt(year) - 1) '-11-' day;
return dateObj;
}
if (parseInt(month) == 3) {//如果是3月份，则取上一年的12月份
dateObj.last = (parseInt(year) - 1) '-12-' day;
return dateObj;
}
var preSize = new Date(year, parseInt(month) - 3, 0).getDate();//开始时间所在月的总天数
if (preSize < parseInt(day)) {
// 开始时间所在月的总天数<本月总天数，比如当前是5月30日，在2月中没有30，则取下个月的第一天(3月1日)为开始时间
let resultMonth = parseInt(month) - 2 < 10 ? ('0' parseInt(month) - 2) : (parseInt(month) - 2);
dateObj.last = year '-' resultMonth '-01';
return dateObj;
}
if (parseInt(month) <= 10) {
dateObj.last = year '-0' (parseInt(month) - 3) '-' day;
return dateObj;
} else {
dateObj.last = year '-' (parseInt(month) - 3) '-' day;
return dateObj;
}
};
//{last: "2021-12-31",now: "2022-03-31" }
没了，结束了，是不是很简单呐，如有问题，欢迎留言。如果此篇博文对您有帮助，还请动动小手点点关注 点点赞 收藏 ⭐留言呐~，谢谢 ~ ~
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