日期工具类详解编程语言

/** 
* @author: 苗士军 
* @description 日期工具类 
*/ 
DateUtils = { 
//模式 
    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": "日", 
"1": "一", 
"2": "二", 
"3": "三", 
"4": "四", 
"5": "五", 
"6": "六" 
}, 
'en': { 
"0": "Sunday", 
"1": "Monday", 
"2": "Tuesday", 
"3": "Wednesday", 
"4": "Thursday", 
"5": "Friday", 
"6": "Saturday" 
} 
}, 
/** 
* @description 获取当前时间 
* @return {string} 
*/ 
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; 
}, 
/** 
* @description 比较时间大小 
* @param time1 
* @param time2 
* @return {number}  time1>time2 return 1 time1<time2 return -1  time1==time2 return 0 
*/ 
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; 
} 
}, 
/** 
* @description 是否闰年 
* @param year 
* @return {boolean} 
*/ 
isLeapYear: function(year) { 
return ((year % 4 === 0 && year % 100 !== 0) || year % 400 === 0); 
}, 
/** 
* @description 获取某个月的天数，从0开始 
* @param year 
* @param month 
* @return {*} 
*/ 
getDaysOfMonth: function(year, month) { 
return [31, (this.isLeapYear(year) ? 29 : 28), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][month]; 
}, 
/** 
* @description 获取某个月的天数1-12月 
* @param year 
* @param month 
* @return {*} 
*/ 
getDaysOfMonth2: function(year, month) { 
// 将天置为0，会获取其上个月的最后一天 
var date = new Date(year, month, 0); 
return date.getDate(); 
}, 
/** 
* @description 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 
* @param days 
* @return {string} 
*/ 
fromToday: function(days) { 
var today = new Date(); 
today.setDate(today.getDate() + days); 
var date = today.getFullYear() + "-" + (today.getMonth() + 1) + "-" + today.getDate(); 
return date; 
}, 
/** 
* @description 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 (pattern == undefined || pattern =='') { 
return date.toLocaleString(); 
} 
return pattern.replace(/([a-z])/1*/ig, function(matchStr, group1) { 
var replacement = ""; 
switch (group1) { 
case DateUtils.patterns.PATTERN_ERA: //G 
break; 
case DateUtils.patterns.PATTERN_WEEK_YEAR: //Y 
case DateUtils.patterns.PATTERN_YEAR: //y 
replacement = date.getFullYear(); 
break; 
case DateUtils.patterns.PATTERN_MONTH: //M 
var month = date.getMonth() + 1; 
replacement = (month < 10 && matchStr.length >= 2) ? "0" + month : month; 
break; 
case DateUtils.patterns.PATTERN_DAY_OF_MONTH: //d 
var days = date.getDate(); 
replacement = (days < 10 && matchStr.length >= 2) ? "0" + days : days; 
break; 
case DateUtils.patterns.PATTERN_HOUR_OF_DAY1: //k(1~24) 
var hours24 = date.getHours(); 
replacement = hours24; 
break; 
case DateUtils.patterns.PATTERN_HOUR_OF_DAY0: //H(0~23) 
var hours24 = date.getHours(); 
replacement = (hours24 < 10 && matchStr.length >= 2) ? "0" + hours24 : hours24; 
break; 
case DateUtils.patterns.PATTERN_MINUTE: //m 
var minutes = date.getMinutes(); 
replacement = (minutes < 10 && matchStr.length >= 2) ? "0" + minutes : minutes; 
break; 
case DateUtils.patterns.PATTERN_SECOND: //s 
var seconds = date.getSeconds(); 
replacement = (seconds < 10 && matchStr.length >= 2) ? "0" + seconds : seconds; 
break; 
case DateUtils.patterns.PATTERN_MILLISECOND: //S 
var milliSeconds = date.getMilliseconds(); 
replacement = milliSeconds; 
break; 
case DateUtils.patterns.PATTERN_DAY_OF_WEEK: //E 
var day = date.getDay(); 
replacement = DateUtils.week['ch'][day]; 
break; 
case DateUtils.patterns.PATTERN_DAY_OF_YEAR: //D 
replacement = DateUtils.dayOfTheYear(date); 
break; 
case DateUtils.patterns.PATTERN_DAY_OF_WEEK_IN_MONTH: //F 
var days = date.getDate(); 
replacement = Math.floor(days / 7); 
break; 
case DateUtils.patterns.PATTERN_WEEK_OF_YEAR: //w 
var days = DateUtils.dayOfTheYear(date); 
replacement = Math.ceil(days / 7); 
break; 
case DateUtils.patterns.PATTERN_WEEK_OF_MONTH: //W 
var days = date.getDate(); 
replacement = Math.ceil(days / 7); 
break; 
case DateUtils.patterns.PATTERN_AM_PM: //a 
var hours24 = date.getHours(); 
replacement = hours24 < 12 ? "上午" : "下午"; 
break; 
case 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 DateUtils.patterns.PATTERN_HOUR0: //K(0~11) 
var hours12 = date.getHours() % 12; 
replacement = hours12; 
break; 
case DateUtils.patterns.PATTERN_ZONE_NAME: //z 
replacement = DateUtils.getZoneNameValue(date)['name']; 
break; 
case DateUtils.patterns.PATTERN_ZONE_VALUE: //Z 
replacement = DateUtils.getZoneNameValue(date)['value']; 
break; 
case DateUtils.patterns.PATTERN_ISO_DAY_OF_WEEK: //u 
break; 
case DateUtils.patterns.PATTERN_ISO_ZONE: //X 
break; 
default: 
break; 
} 
return replacement; 
}); 
}, 
/** 
* @description 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, (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; 
}, 
/** 
* @description 获得时区名和值 
* @param dateObj 
* @return {{name: *, value: *}} 
*/ 
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; 
} 
};