//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(paraYear,paraMonth){
var monthStartDate = new Date(paraYear, paraMonth, 1);
var monthEndDate = new Date(paraYear, paraMonth + 1, 1);
var days = (monthEndDate - monthStartDate)/(1000 * 60 * 60 * 24);
return days;
}
//获得某周的开始日期
function getWeekStartDate(paraYear,paraMonth,paraDay,paraDayOfWeek) {
var weekStartDate = new Date(paraYear, paraMonth, paraDay + 1 - paraDayOfWeek);
return formatDate(weekStartDate);
}
//获得某周的结束日期
function getWeekEndDate(paraYear,paraMonth,paraDay,paraDayOfWeek) {
var weekEndDate = new Date(paraYear, paraMonth, paraDay + (7 - paraDayOfWeek));
return formatDate(weekEndDate);
}
//获得某月的开始日期
function getMonthStartDate(paraYear,paraMonth){
var monthStartDate = new Date(paraYear, paraMonth, 1);
return formatDate(monthStartDate);
}
//获得某月的结束日期
function getMonthEndDate(paraYear,paraMonth){
var monthEndDate = new Date(paraYear,paraMonth, getMonthDays(paraYear,paraMonth));
return formatDate(monthEndDate);
}
//获得上月开始时间
function getLastMonthStartDate(paraYear, lastMonth){
var lastMonthStartDate = new Date(paraYear, lastMonth, 1);
return formatDate(lastMonthStartDate);
}
//获得上月结束时间
function getLastMonthEndDate(paraYear, lastMonth, lastMonth){
var lastMonthEndDate = new Date(paraYear, lastMonth, getMonthDays(lastMonth));
return formatDate(lastMonthEndDate);
}
//获得某季度的开始日期
function getQuarterStartDate(paraYear,paraSeason){
switch (paraSeason){
case ‘1‘ : return paraYear+"-01-01";
case ‘2‘ : return paraYear+"-04-01";
case ‘3‘ : return paraYear+"-07-01";
case ‘4‘ : return paraYear+"-10-01";
}
}
//获得某季度的结束日期
function getQuarterEndDate(paraYear,paraSeason){
switch (paraSeason){
case ‘1‘ : return paraYear+"-03-31";
case ‘2‘ : return paraYear+"-06-30";
case ‘3‘ : return paraYear+"-09-30";
case ‘4‘ : return paraYear+"-12-31";
}
}
//获取某年某周的开始日期
function getBeginDateOfWeek(paraYear, weekIndex){
var firstDay = GetFirstWeekBegDay(paraYear);
//7*24*3600000 是一星期的时间毫秒数,(JS中的日期精确到毫秒)
var time=(weekIndex-1)*7*24*3600000;
var beginDay = firstDay;
//为日期对象 date 重新设置成时间 time
beginDay.setTime(firstDay.valueOf()+time);
return formatDate(beginDay);
}
//获取某年某周的结束日期
function getEndDateOfWeek(paraYear, weekIndex){
var firstDay = GetFirstWeekBegDay(paraYear);
//7*24*3600000 是一星期的时间毫秒数,(JS中的日期精确到毫秒)
var time=(weekIndex-1)*7*24*3600000;
var weekTime = 6*24*3600000;
var endDay = firstDay;
//为日期对象 date 重新设置成时间 time
endDay.setTime(firstDay.valueOf()+weekTime+time);
return formatDate(endDay);
}
//获取日期为某年的第几周
function GetWeekIndex(dateobj) {
var firstDay = GetFirstWeekBegDay(dateobj.getFullYear());
if (dateobj < firstDay) {
firstDay = GetFirstWeekBegDay(dateobj.getFullYear() - 1);
}
d = Math.floor((dateobj.valueOf() - firstDay.valueOf()) / 86400000);
return Math.floor(d / 7) + 1;
}
//获取某年的第一天
function GetFirstWeekBegDay(year) {
var tempdate = new Date(year, 0, 1);
var temp = tempdate.getDay();
if (temp == 1){
return tempdate;
}
temp = temp == 0 7 : temp;
tempdate = tempdate.setDate(tempdate.getDate() + (8 - temp));
return new Date(tempdate);
}