Flex 日期操作之三（获取前天的日期）

在C#中获取前天的日期只需调用内部的方法即可

?//计算前天
string strYersterday = DateTime.Now.AddDays(-2).ToString("yyyy-MM-dd");

在Flex中不知道有没有这种方法，自己用最原始的办法写了一个，没有判断是否有闰年的情况

//从时间格式里面提取昨天的年月日

private function getYearMonDay_Before(date:Date):String { var strYMD:String; var strMon:String; var strDay:String; if(date == null) { strYMD = "2020/12/31"; } else { if((date.getMonth()+1)<10) { strMon = "0" + (date.getMonth()+1).toString(); if((date.getDate()-2)<10&&(date.getDate()-2)>0) strDay = "0" + (date.getDate()-2).toString(); else if((date.getDate() - 2) == 0) { switch(strMon) { case "01": strDay = "31"; strMon = "12"; break; case "02": strDay = "31"; strMon = "01"; break; case "03": strDay = "28"; strMon = "02"; break; case "04": strDay = "31"; strMon = "03"; break; case "05": strDay ="30"; strMon = "04"; break; case "06": strDay = "31"; strMon = "05"; break; case "07": strDay = "30"; strMon = "06"; break; case "08": strDay = "31"; strMon = "07"; break; case "09": strDay = "31"; strMon = "08"; break; case "10": strDay = "30"; strMon = "09"; break; case "11": strDay = "31"; strMon ="10"; break; case "12": strDay ="30"; strMon = "11"; break; } } else if (date.getDate()-2 < 0) { switch(strMon) { case "01": strDay = "30"; strMon = "12"; break; case "02": strDay = "30"; strMon = "01"; break; case "03": strDay = "27"; strMon = "02"; break; case "04": strDay = "30"; strMon = "03"; break; case "05": strDay ="29"; strMon = "04"; break; case "06": strDay = "30"; strMon = "05"; break; case "07": strDay = "29"; strMon = "06"; break; case "08": strDay = "30"; strMon = "07"; break; case "09": strDay = "30"; strMon = "08"; break; case "10": strDay = "29"; strMon = "09"; break; case "11": strDay = "30"; strMon ="10"; break; case "12": strDay ="29"; strMon = "11"; break; } } else strDay = (date.getDate()-2).toString(); } else { strMon = (date.getMonth()+1).toString(); if((date.getDate()-2)<10&&(date.getDate()-2)>0) strDay = "0" + (date.getDate()-2).toString(); else if((date.getDate() - 2) == 0) { switch(strMon) { case "01": strDay = "31"; strMon = "12"; break; case "02": strDay = "31"; strMon = "01"; break; case "03": strDay = "28"; strMon = "02"; break; case "04": strDay = "31"; strMon = "03"; break; case "05": strDay ="30"; strMon = "04"; break; case "06": strDay = "31"; strMon = "05"; break; case "07": strDay = "30"; strMon = "06"; break; case "08": strDay = "31"; strMon = "07"; break; case "09": strDay = "31"; strMon = "08"; break; case "10": strDay = "30"; strMon = "09"; break; case "11": strDay = "31"; strMon ="10"; break; case "12": strDay ="30"; strMon = "11"; break; } } else if (date.getDate()-2 < 0) { switch(strMon) { case "01": strDay = "30"; strMon = "12"; break; case "02": strDay = "30"; strMon = "01"; break; case "03": strDay = "27"; strMon = "02"; break; case "04": strDay = "30"; strMon = "03"; break; case "05": strDay ="29"; strMon = "04"; break; case "06": strDay = "30"; strMon = "05"; break; case "07": strDay = "29"; strMon = "06"; break; case "08": strDay = "30"; strMon = "07"; break; case "09": strDay = "30"; strMon = "08"; break; case "10": strDay = "29"; strMon = "09"; break; case "11": strDay = "30"; strMon ="10"; break; case "12": strDay ="29"; strMon = "11"; break; } } else strDay = (date.getDate()-2).toString(); } strYMD = date.getFullYear().toString()+"/"+strMon+"/"+ strDay; } return strYMD; }