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：
DateUtils = {
patterns: {
PATTERN_ERA: 'G', //Era 标志符 Era strings. For example: "AD" and "BC"
PATTERN_YEAR: 'y', //年
PATTERN_MONTH: 'M', //月份
PATTERN_DAY_OF_MONTH: 'd', //月份的天数
PATTERN_HOUR_OF_DAY1: 'k', //一天中的小时数（1-24）
PATTERN_HOUR_OF_DAY0: 'H', //24小时制，一天中的小时数（0-23）
PATTERN_MINUTE: 'm', //小时中的分钟数
PATTERN_SECOND: 's', //秒
PATTERN_MILLISECOND: 'S', //毫秒
PATTERN_DAY_OF_WEEK: 'E', //一周中对应的星期，如星期一，周一
PATTERN_DAY_OF_YEAR: 'D', //一年中的第几天
PATTERN_DAY_OF_WEEK_IN_MONTH: 'F', //一月中的第几个星期(会把这个月总共过的天数除以7,不够准确，推荐用W)
PATTERN_WEEK_OF_YEAR: 'w', //一年中的第几个星期
PATTERN_WEEK_OF_MONTH: 'W', //一月中的第几星期(会根据实际情况来算)
PATTERN_AM_PM: 'a', //上下午标识
PATTERN_HOUR1: 'h', //12小时制 ，am/pm 中的小时数（1-12）
PATTERN_HOUR0: 'K', //和h类型
PATTERN_ZONE_NAME: 'z', //时区名
PATTERN_ZONE_VALUE: 'Z', //时区值
PATTERN_WEEK_YEAR: 'Y', //和y类型
PATTERN_ISO_DAY_OF_WEEK: 'u',
PATTERN_ISO_ZONE: 'X'
},
week: {
'ch': {
"0": "u65e5",
"1": "u4e00",
"2": "u4e8c",
"3": "u4e09",
"4": "u56db",
"5": "u4e94",
"6": "u516d"
},
'en': {
"0": "Sunday",
"1": "Monday",
"2": "Tuesday",
"3": "Wednesday",
"4": "Thursday",
"5": "Friday",
"6": "Saturday"
}
},
//获取当前时间
getCurrentTime: function() {
var today = new Date();
var year = today.getFullYear();
var month = today.getMonth() + 1;
var day = today.getDate();
var hours = today.getHours();
var minutes = today.getMinutes();
var seconds = today.getSeconds();
var timeString = year + "-" + month + "-" + day + " " + hours + ":" + minutes + ":" + seconds;
return timeString;
},
compareTime: function(time1, time2) {
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 -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, 30, 31, 31, 30, 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();
},
fromToday: function(days) {
var today = new Date();
today.setDate(today.getDate() + days);
var date = today.getFullYear() + "-" + (today.getMonth() + 1) + "-" + today.getDate();
return date;
},
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 ? "u4e0au5348" : "u4e0bu5348";
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;
});
},
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, (this.isLeapYear(year) ? 29 : 28), 31, 30, 31, 30, 31, 31, 30, 31, 30, 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：http://tools.jb51.net/code/HtmlJsRun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：
在线日期/天数计算器：
http://tools.jb51.net/jisuanqi/date_jisuanqi
在线日期计算器/相差天数计算器：
http://tools.jb51.net/jisuanqi/datecalc
在线日期天数差计算器：
http://tools.jb51.net/jisuanqi/onlinedatejsq
在线天数计算器：
http://tools.jb51.net/jisuanqi/datejsq
更多关于Javascript相关内容感兴趣的读者可查看本站专题：《Javascript时间与日期操作技巧总结》、《Javascript+HTML5特效与技巧汇总》、《Javascript错误与调试技巧总结》、《Javascript数据结构与算法技巧总结》及《Javascript数学运算用法总结》
希望本文所述对大家Javascript程序设计有所帮助。
