JS获取本周、本季度、本月、上月、本年的开始日期、结束日期
/** * 获取本周、本季度、本月、上月的开始日期、结束日期 */ var now = new Date(); //当前日期 var nowDayOfWeek = now.getDay(); //今天本周的第几天 var nowDay = now.getDate(); //当前日 var nowMonth = now.getMonth(); //当前月 var nowYear = now.getYear(); //当前年 nowYear += (nowYear < 2000) ? 1900 : 0; // var lastMonthDate = new Date(); //上月日期 lastMonthDate.setDate(1); lastMonthDate.setMonth(lastMonthDate.getMonth()-1); var lastYear = lastMonthDate.getYear(); var lastMonth = lastMonthDate.getMonth(); //格式化日期:yyyy-MM-dd function formatDate(date) { var myyear = date.getFullYear(); var mymonth = date.getMonth()+1; var myweekday = date.getDate(); if(mymonth < 10){ mymonth = "0" + mymonth; } if(myweekday < 10){ myweekday = "0" + myweekday; } return (myyear+"-"+mymonth + "-" + myweekday); } //获得某月的天数 function getMonthDays(myMonth){ var monthStartDate = new Date(nowYear, myMonth, 1); var monthEndDate = new Date(nowYear, myMonth + 1, 1); var days = (monthEndDate - monthStartDate)/(1000 * 60 * 60 * 24); return days; } //获得本季度的开始月份 function getQuarterStartMonth(){ var quarterStartMonth = 0; if(nowMonth<3){ quarterStartMonth = 0; } if(2<nowMonth && nowMonth<6){ quarterStartMonth = 3; } if(5<nowMonth && nowMonth<9){ quarterStartMonth = 6; } if(nowMonth>8){ quarterStartMonth = 9; } return quarterStartMonth; } //获得本周的开始日期 function getWeekStartDate() { var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek); return formatDate(weekStartDate); } //获得本周的结束日期 function getWeekEndDate() { var weekEndDate = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek)); return formatDate(weekEndDate); } //获得本月的开始日期 function getMonthStartDate(){ var monthStartDate = new Date(nowYear, nowMonth, 1); return formatDate(monthStartDate); } //获得本月的结束日期 function getMonthEndDate(){ var days= getMonthDays(nowMonth);//获取当月总共有多少天 var monthEndDate = new Date(nowYear, nowMonth, days); return formatDate(monthEndDate); //返回当月结束时间 } 注意:因为上面这个方法里的getMonthDays(nowMonth)方法 我尝试使用失败,我不知道是什么原因 所以我用了另外个方法如下(获得某月的天数,需要配合文章开头的公式 ): //获得某月的天数 (与上面有重复可删除,不然本月结束日期报错) function getMonthDays(nowyear,myMonth){ var lastMonthStartDate = new Date(nowyear, lastMonth, 1); var lastMonthEndDate= new Date(nowyear, lastMonth+ 1, 1); var days = (lastMonthEndDate- lastMonthStartDate) / (1000 * 60 * 60 * 24);//格式转换 alert(days); } //获得上月开始时间 function getLastMonthStartDate(){ var lastMonthStartDate = new Date(nowYear, lastMonth, 1); return formatDate(lastMonthStartDate); } //获得上月结束时间 function getLastMonthEndDate(){ var lastMonthEndDate = new Date(nowYear, lastMonth, getMonthDays(lastMonth)); return formatDate(lastMonthEndDate); } //获得本季度的开始日期 function getQuarterStartDate(){ var quarterStartDate = new Date(nowYear, getQuarterStartMonth(), 1); return formatDate(quarterStartDate); } //或的本季度的结束日期 function getQuarterEndDate(){ var quarterEndMonth = getQuarterStartMonth() + 2; var quarterStartDate = new Date(nowYear, quarterEndMonth, getMonthDays(quarterEndMonth)); return formatDate(quarterStartDate); } //获取本年开始-当前时间 var currentYear=now.getFullYear();//获得当前年份4位年 var currentYearFirstDate=new Date(currentYear,0,1); //本年第一天 var startTime = currentYearFirstDate.getFullYear() + '-' + (currentYearFirstDate.getMonth() +1) + '-' + currentYearFirstDate.getDate()+''+currentYearFirstDate.getHours()+':'+currentYearFirstDate.getMinutes()+':'+ currentYearFirstDate.getSeconds(); //格式化本年第一天日期 var currentYearEndDate=now; //当前时间