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日期工具类知识解答

flyfish 2021年05月25日 编程语言 200 0
/** 
 * @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', // 
        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', // 
        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; 
    } 
};

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