[JavaScript]日期函數應用

//日期轉換爲格式"yyyy-mm-dd"
function transferDate(date)
{
  var yearTemp = date.getYear();
  var monthTemp = date.getMonth() + 1;
  var dayTemp = date.getDate();
  if (parseInt(monthTemp) < 10)
  {
    monthTemp = "0" + monthTemp;
  }

  if (parseInt(dayTemp) < 10)
  {
    dayTemp = "0" + dayTemp;
  }

  return yearTemp + "-" + monthTemp + "-" + dayTemp;
}

//根據日期獲取周號
function getWeekNo(dateStr)
{
  var myDate = new Date(dateStr);
  var tempDate = new Date(myDate.getFullYear(),0,1);
  var weekDay = parseInt("1065432".charAt(myDate.getDay()));
  var tempTime = myDate.getTime() - tempDate.getTime() - weekDay * 24 * 60 * 60 * 1000;
  weekNo = Math.ceil(tempTime / (7 * 24 * 60 * 60 * 1000));
  return weekNo + 1;
}

//根據日期獲取本週週一的日期
function getMonday(dateStr)
{
  var date = new Date(dateStr);
  var weekDay = date.getDay(); // 今天是這周的第幾天
  var n = - weekDay + 1; // 距離天數
  //星期天的算法不同
  if (weekDay == 0)
  {
    n = -7;    
  }
  var time = date.getTime();
  var monday = new Date(time + n * 24 * 3600 * 1000);
  return transferDate(monday);
}

//根據日期獲取本週週日的日期
function getSunday(dateStr)
{
  var date = new Date(dateStr);
  var weekDay = date.getDay(); // 今天是這周的第幾天
  var n = 7 - weekDay; // 週日距離今天的天數
  var time = date.getTime();
  var sunday = new Date(time + n * 24 * 3600 * 1000);
  return transferDate(sunday);
}

alert(getSunday("2010/07/06"));