js最近日期获取汇总

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常用日期汇总

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* 获取近半年日期
function halfYear() {
  // 先获取当前时间
  let curDate = (new Date()).getTime();
  // 将半年的时间单位换算成毫秒
  let halfYear = 365 / 2 * 24 * 3600 * 1000;
  // 半年前的时间（毫秒单位）
  let pastResult = curDate - halfYear;
  // 日期函数，定义起点为半年前
  let pastDate = new Date(pastResult);
  let pastYear = pastDate.getFullYear();
  let pastMonth = pastDate.getMonth() + 1;
  pastMonth = pastMonth.toString().padStart(2, 0);
  let pastDay = pastDate.getDate().toString().padStart(2, 0);
  let endDate = pastYear + '-' + pastMonth + '-' + pastDay;
  return endDate;
}
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* 获取近一年日期
function reactYear() {
  let nowDate = new Date();
  let dates = new Date(nowDate);
  dates.setDate(dates.getDate() - 365);
  let year = dates.getFullYear();
  let month = dates.getMonth() + 1;
  month = month.toString().padStart(2, 0);
  let strDate = dates.getDate().toString().padStart(2, 0);
  let currentDate = year + '-' + month + '-' + strDate;
  return currentDate;
}
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* 获取当前日期
function getCurDate(type) {
  const date = new Date();
  // date.setTime(date.getTime() + 24 * 60 * 60 * 1000);
  date.setTime(date.getTime());
  let year = date.getFullYear()
  let month = date.getMonth() + 1
  month = month.toString().padStart(2, 0);
  let strDate = date.getDate().toString().padStart(2, 0);
  let hour = date.getHours().toString().padStart(2, 0);
  let minutes = date.getMinutes().toString().padStart(2, 0);
  let seconds = date.getSeconds().toString().padStart(2, 0);
  let curDate = year + '-' + month + '-' + strDate;
  if(type) {
    return `${year}-${month}-${strDate} ${hour}:${minutes}:${seconds}`;
  }
  return curDate;
}
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* 最近三月
function beforeThree() {
  const dates = new Date()
  dates.setMonth(dates.getMonth() - 3);
  let pastMonth = dates.getMonth() + 1;
  let pastDay = dates.getDate();
  pastMonth = pastMonth.toString().padStart(2, 0);
  pastDay = pastDay.toString().padStart(2, 0);
  const endDate = dates.getFullYear() + '-' + pastMonth + '-' + pastDay;
  return endDate;
}
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* 最近一月
function oneMonth() {
  const dates = new Date();
  dates.setMonth(dates.getMonth() - 1);
  let pastMonth = dates.getMonth() + 1;
  let pastDay = dates.getDate();
  pastMonth = pastMonth.toString().padStart(2, 0);
  pastDay = pastDay.toString().padStart(2, 0);
  const endDate = dates.getFullYear() + '-' + pastMonth + '-' + pastDay;
  return endDate
}
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* 某年某月最后一天
function getLastDay(year, month) {
  //获取本年本月的第一天日期
  var date = new Date(year,month+1,'01');
  //设置日期
  date.setDate(1);
  //设置月份
  date.setMonth(date.getMonth());
  //获取本月的最后一天
  let cdate = new Date(date.getTime() - 1000*60*60*24);
  //返回结果
  // return cdate.getDate();
  return `${cdate.getFullYear()}-${cdate.getMonth()+1}-${cdate.getDate()}`;
}
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* 当月
function getMonthStartDate() {
  const dates = new Date();
  dates.setMonth(dates.getMonth());
  let pastMonth = dates.getMonth() + 1;
  pastMonth = pastMonth.toString().padStart(2, 0);
  const endDate = dates.getFullYear() + '-' + pastMonth + '-' + '01';
  return endDate
}
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* 获取某月多少天
const _temp = '2021-06-12';
const month = _temp.substr(_temp.lastIndexOf("-") + 1, 2);
const year = _temp.substr(0, _temp.lastIndexOf("-"));
// console.log(1111, year, month, new Date(year, month, 0).getDate())
// 获取月份多少天
const day = new Date(year, month, 0).getDate();
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* 获取当年当月第一天
getYearStartDate() {
  const dates = new Date();
  dates.setMonth(dates.getMonth());
  const endDate = dates.getFullYear() + "-" + "01" + "-" + "01";
  return endDate;
}
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// utils.js
const globalFun =  {
  halfYear, reactYear, getCurDate, beforeThree, oneMonth,getLastDay, checkFull, getMonthStartDate,
};
export default globalFun;

// 全局方法挂载 main.js
import globalFun from "@/utils/utils.js";
Object.keys(globalFun).forEach((key) => {
  Vue.prototype[key] = globalFun[key];
})