js中使用eval()方法將字串轉換成日期格式、並獲取指定時間的日期
阿新 • • 發佈:2019-02-15
1、在js中eval()方法將字串格式資料轉換成日期格式
function getDate(strDate) {
//strDate為需要轉換成日期格式的字串
var date = eval('new Date(' + strDate.replace(/\d+(?=-[^-]+$)/,
function (a) { return parseInt(a, 10) - 1; }).match(/\d+/g) + ')');
return date;
}
2、獲取當前日期的前一天日期
function getYestoday(date){ var yesterday_milliseconds=date.getTime()-1000*60*60*24; var yesterday = new Date(); yesterday.setTime(yesterday_milliseconds); var strYear = yesterday.getFullYear(); var strDay = yesterday.getDate(); var strMonth = yesterday.getMonth()+1; if(strMonth<10) { strMonth="0"+strMonth; } datastr = strYear+"-"+strMonth+"-"+strDay; return datastr; }
3、獲得上個月在昨天這一天的日期
function getLastMonthYestday(date){ var daysInMonth = new Array([0],[31],[28],[31],[30],[31],[30],[31],[31],[30],[31],[30],[31]); var strYear = date.getFullYear(); var strDay = date.getDate(); var strMonth = date.getMonth()+1; if(strYear%4 == 0 && strYear%100 != 0){ daysInMonth[2] = 29; } if(strMonth - 1 == 0) { strYear -= 1; strMonth = 12; } else { strMonth -= 1; } strDay = daysInMonth[strMonth] >= strDay ? strDay : daysInMonth[strMonth]; if(strMonth<10) { strMonth="0"+strMonth; } if(strDay<10) { strDay="0"+strDay; } datastr = strYear+"-"+strMonth+"-"+strDay; return datastr; }
4、獲得上一年在昨天這一天的日期
function getLastYearYestdy(date){ var strYear = date.getFullYear() - 1; var strDay = date.getDate(); var strMonth = date.getMonth()+1; if(strMonth<10) { strMonth="0"+strMonth; } if(strDay<10) { strDay="0"+strDay; } datastr = strYear+"-"+strMonth+"-"+strDay; return datastr; }
5、獲得下個月在昨天這一天的日期
function getLastMonthYestdy2(date){
var daysInMonth = new Array([0],[31],[28],[31],[30],[31],[30],[31],[31],[30],[31],[30],[31]);
var strYear = date.getFullYear();
var strDay = date.getDate();
var strMonth = date.getMonth()+1;
if(strYear%4 == 0 && strYear%100 != 0){
daysInMonth[2] = 29;
}
if(strMonth + 1 == 13)
{
strYear += 1;
strMonth = 1;
}
else
{
strMonth += 1;
}
strDay = daysInMonth[strMonth] >= strDay ? strDay : daysInMonth[strMonth];
if(strMonth<10)
{
strMonth="0"+strMonth;
}
if(strDay<10)
{
strDay="0"+strDay;
}
datastr = strYear+"-"+strMonth+"-"+strDay;
return datastr;
}
6、測試
$(function() {
var strDate = '2014-06-11';
$("#test").html("用eval()方法將字串轉換為時間格式:" + getDate(strDate) + "<br/>" +
"獲取當前日期的前一天日期:" + getYestoday(getDate(strDate)) + "<br/>" +
"獲得上個月在昨天這一天的日期:" + getLastMonthYestday(getDate(strDate)) + "<br/>" +
"獲得上一年在昨天這一天的日期:" + getLastYearYestdy(getDate(strDate)) + "<br/>" +
"獲得下個月在昨天這一天的日期:" + getLastMonthYestdy2(getDate(strDate)) + "<br/>");
})
7、測試結果