本文实例讲述了JavaScript日期工具类DateUtils定义与用法。分享给大家供大家参考，具体如下：
time2 return 1
* time1 Date.parse(time2.replace(/-/g,"/"))) {
return 1;
} else if(Date.parse(time1.replace(/-/g,"/")) < Date.parse(time2.replace(/-/g,"/"))) {
return -1;
} else if(Date.parse(time1.replace(/-/g,"/")) == Date.parse(time2.replace(/-/g,"/"))) {
return 0;
}
},//是否闰年
isLeapYear: function(year) {
return((year % 4 === 0 && year % 100 !== 0) || year % 400 === 0);
},//获取某个月的天数，从0开始
getDaysOfMonth: function(year,month) {
return [31,(this.isLeapYear(year) ? 29 : 28),31,30,31][month];
},getDaysOfMonth2: function(year,month) {
// 将天置为0，会获取其上个月的最后一天
month = parseInt(month) + 1;
var date = new Date(year,month,0);
return date.getDate();
},/*距离现在几天的日期：负数表示今天之前的日期，0表示今天，整数表示未来的日期
* 如-1表示昨天的日期，0表示今天，2表示后天
*/
fromToday: function(days) {
var today = new Date();
today.setDate(today.getDate() + days);
var date = today.getFullYear() + "-" + (today.getMonth() + 1) + "-" + today.getDate();
return date;
},/**
* 日期时间格式化
* @param {Object} dateTime 需要格式化的日期时间
* @param {String} pattern 格式化的模式，如yyyy-MM-dd hh(HH):mm:ss.S a k K E D F w W z Z
*/
formt: function(dateTime,pattern) {
var date = new Date(dateTime);
if(Bee.StringUtils.isBlank(pattern)) {
return date.toLocaleString();
}
return pattern.replace(/([a-z])\1*/ig,function(matchStr,group1) {
var replacement = "";
switch(group1) {
case Bee.DateUtils.patterns.PATTERN_ERA: //G
break;
case Bee.DateUtils.patterns.PATTERN_WEEK_YEAR: //Y
case Bee.DateUtils.patterns.PATTERN_YEAR: //y
replacement = date.getFullYear();
break;
case Bee.DateUtils.patterns.PATTERN_MONTH: //M
var month = date.getMonth() + 1;
replacement = (month < 10 && matchStr.length >= 2) ? "0" + month : month;
break;
case Bee.DateUtils.patterns.PATTERN_DAY_OF_MONTH: //d
var days = date.getDate();
replacement = (days < 10 && matchStr.length >= 2) ? "0" + days : days;
break;
case Bee.DateUtils.patterns.PATTERN_HOUR_OF_DAY1: //k(1~24)
var hours24 = date.getHours();
replacement = hours24;
break;
case Bee.DateUtils.patterns.PATTERN_HOUR_OF_DAY0: //H(0~23)
var hours24 = date.getHours();
replacement = (hours24 < 10 && matchStr.length >= 2) ? "0" + hours24 : hours24;
break;
case Bee.DateUtils.patterns.PATTERN_MINUTE: //m
var minutes = date.getMinutes();
replacement = (minutes < 10 && matchStr.length >= 2) ? "0" + minutes : minutes;
break;
case Bee.DateUtils.patterns.PATTERN_SECOND: //s
var seconds = date.getSeconds();
replacement = (seconds < 10 && matchStr.length >= 2) ? "0" + seconds : seconds;
break;
case Bee.DateUtils.patterns.PATTERN_MILLISECOND: //S
var milliSeconds = date.getMilliseconds();
replacement = milliSeconds;
break;
case Bee.DateUtils.patterns.PATTERN_DAY_OF_WEEK: //E
var day = date.getDay();
replacement = Bee.DateUtils.week['ch'][day];
break;
case Bee.DateUtils.patterns.PATTERN_DAY_OF_YEAR: //D
replacement = Bee.DateUtils.dayOfTheYear(date);
break;
case Bee.DateUtils.patterns.PATTERN_DAY_OF_WEEK_IN_MONTH: //F
var days = date.getDate();
replacement = Math.floor(days / 7);
break;
case Bee.DateUtils.patterns.PATTERN_WEEK_OF_YEAR: //w
var days = Bee.DateUtils.dayOfTheYear(date);
replacement = Math.ceil(days / 7);
break;
case Bee.DateUtils.patterns.PATTERN_WEEK_OF_MONTH: //W
var days = date.getDate();
replacement = Math.ceil(days / 7);
break;
case Bee.DateUtils.patterns.PATTERN_AM_PM: //a
var hours24 = date.getHours();
replacement = hours24 < 12 ? "\u4e0a\u5348" : "\u4e0b\u5348";
break;
case Bee.DateUtils.patterns.PATTERN_HOUR1: //h(1~12)
var hours12 = date.getHours() % 12 || 12; //0转为12
replacement = (hours12 < 10 && matchStr.length >= 2) ? "0" + hours12 : hours12;
break;
case Bee.DateUtils.patterns.PATTERN_HOUR0: //K(0~11)
var hours12 = date.getHours() % 12;
replacement = hours12;
break;
case Bee.DateUtils.patterns.PATTERN_ZONE_NAME: //z
replacement = Bee.DateUtils.getZoneNameValue(date)['name'];
break;
case Bee.DateUtils.patterns.PATTERN_ZONE_VALUE: //Z
replacement = Bee.DateUtils.getZoneNameValue(date)['value'];
break;
case Bee.DateUtils.patterns.PATTERN_ISO_DAY_OF_WEEK: //u
break;
case Bee.DateUtils.patterns.PATTERN_ISO_ZONE: //X
break;
default:
break;
}
return replacement;
});
},/**
* 计算一个日期是当年的第几天
* @param {Object} date
*/
dayOfTheYear: function(date) {
var obj = new Date(date);
var year = obj.getFullYear();
var month = obj.getMonth(); //从0开始
var days = obj.getDate();
var daysArr = [31,31];
for(var i = 0; i < month; i++) {
days += daysArr[i];
}
return days;
},//获得时区名和值
getZoneNameValue: function(dateObj) {
var date = new Date(dateObj);
date = new Date(Date.UTC(date.getFullYear(),date.getMonth(),date.getDate()));
var arr = date.toString().match(/([A-Z]+)([-+]\d+:?\d+)/);
var obj = {
'name': arr[1],'value': arr[2]
};
return obj;
}
};
//用法示例
console.log(DateUtils.getCurrentTime())//获取当前时间
console.log(DateUtils.compareTime('2018-8-1','2018-9-3'))//比较时间
console.log(DateUtils.isLeapYear('2018'))//是否闰年
console.log(DateUtils.getDaysOfMonth('2018','9'))//获取指定月份的天数（从0计数）
console.log(DateUtils.dayOfTheYear('2018-9-3'))//计算指定日期是当年第几天
使用在线HTML/CSS/JavaScript代码运行工具：测试运行结果如下：
PS：这里再为大家推荐几款比较实用的天数计算在线工具供大家使用：
更多关于JavaScript相关内容感兴趣的读者可查看本站专题：《》、《》、《》、《》及《》
希望本文所述对大家JavaScript程序设计有所帮助。
