jsの常用パッケージ関数ライブラリのDate操作

/*
*     ：Date
*/

class DateFn {
    /**
     *      
     *
     * @param  {time}   
     * @param  {cFormat}   
     * @return {String}    
     *
     * @example formatTime('2018-1-29', '{y}/{m}/{d} {h}:{i}:{s}') // -> 2018/01/29 00:00:00
     */
    formatTime(time, cFormat) {
        if (arguments.length === 0) return null;
        if ((time + '').length === 10) {
            time = +time * 1000
        }

        var format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}', date;
        if (typeof time === 'object') {
            date = time
        } else {
            date = new Date(time)
        }

        var formatObj = {
            y: date.getFullYear(),
            m: date.getMonth() + 1,
            d: date.getDate(),
            h: date.getHours(),
            i: date.getMinutes(),
            s: date.getSeconds(),
            a: date.getDay()
        };
        var time_str = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => {
            var value = formatObj[key];
            if (key === 'a') return [' ', ' ', ' ', ' ', ' ', ' ', ' '][value - 1]
            if (result.length > 0 && value < 10) {
                value = '0' + value
            }
            return value || 0
        });
        return time_str
    }


    /**
     *            
     *
     * @param  {time}   
     * @param  {len}   
     * @param  {direction}   ：  1:     ;  2:     ;  3:          3
     * @return {Array}   
     *
     * @example   getMonths('2018-1-29', 6, 1)  // ->  ["2018-1", "2017-12", "2017-11", "2017-10", "2017-9", "2017-8", "2017-7"]
     */
    getMonths(time, len, direction) {
        var mm = new Date(time).getMonth(),
            yy = new Date(time).getFullYear(),
            direction = isNaN(direction) ? 3 : direction,
            index = mm;
        var cutMonth = function(index) {
            if ( index <= len && index >= -len) {
                return direction === 1 ? formatPre(index).concat(cutMonth(++index)):
                    direction === 2 ? formatNext(index).concat(cutMonth(++index)):formatCurr(index).concat(cutMonth(++index))
            }
            return []
        };
        var formatNext = function(i) {
            var y = Math.floor(i/12),
                m = i%12;
            return [yy+y + '-' + (m+1)]
        };
        var formatPre = function(i) {
            var y = Math.ceil(i/12),
                m = i%12;
            m = m===0 ? 12 : m;
            return [yy-y + '-' + (13 - m)]
        };
        var formatCurr = function(i) {
            var y = Math.floor(i/12),
                yNext = Math.ceil(i/12),
                m = i%12,
                mNext = m===0 ? 12 : m;
            return [yy-yNext + '-' + (13 - mNext),yy+y + '-' + (m+1)]
        };
        //     
        var unique = function(arr) {
            if ( Array.hasOwnProperty('from') ) {
                return Array.from(new Set(arr));
            }else{
                var n = {},r=[];
                for(var i = 0; i < arr.length; i++){
                    if (!n[arr[i]]){
                        n[arr[i]] = true;
                        r.push(arr[i]);
                    }
                }
                return r;
            }
        };
        return direction !== 3 ? cutMonth(index) : unique(cutMonth(index).sort(function(t1, t2){
            return new Date(t1).getTime() - new Date(t2).getTime()
        }))
    }



    /**
     *            
     *
     * @param  {time}   
     * @param  {len}   
     * @param  {direction}   ： 1:    ;  2:    ;  3:         3
     * @return {Array}   
     *
     * @example date.getDays('2018-1-29', 6) // -> ["2018-1-26", "2018-1-27", "2018-1-28", "2018-1-29", "2018-1-30", "2018-1-31", "2018-2-1"]
     */
    getDays(time, len, diretion) {
        var tt = new Date(time);
        var getDay = function(day) {
            var t = new Date(time);
            t.setDate(t.getDate() + day);
            var m = t.getMonth()+1;
            return t.getFullYear()+'-'+m+'-'+t.getDate()
        };
        var arr = [];
        if (diretion === 1) {
            for (var i = 1; i <= len; i++) {
                arr.unshift(getDay(-i))
            }
        }else if(diretion === 2) {
            for (var i = 1; i <= len; i++) {
                arr.push(getDay(i))
            }
        }else {
            for (var i = 1; i <= len; i++) {
                arr.unshift(getDay(-i))
            }
            arr.push(tt.getFullYear()+'-'+(tt.getMonth()+1)+'-'+tt.getDate());
            for (var i = 1; i <= len; i++) {
                arr.push(getDay(i))
            }
        }
        return diretion === 1 ? arr.concat([tt.getFullYear()+'-'+(tt.getMonth()+1)+'-'+tt.getDate()]) :
            diretion === 2 ? [tt.getFullYear()+'-'+(tt.getMonth()+1)+'-'+tt.getDate()].concat(arr) : arr
    }


    /**
     * @param  {s}   
     * @return {String}    
     *
     * @example formatHMS(3610) // -> 1h0m10s
     */
    formatHMS (s) {
        var str = '';
        if (s > 3600) {
            str = Math.floor(s/3600)+'h'+Math.floor(s%3600/60)+'m'+s%60+'s'
        }else if(s > 60) {
            str = Math.floor(s/60)+'m'+s%60+'s'
        }else{
            str = s%60+'s'
        }
        return str
    }

    /*        */
    getMonthOfDay (time) {
        var date = new Date(time);
        var year = date.getFullYear();
        var mouth = date.getMonth() + 1;
        var days;

        //       ，             
        if (mouth == 2) {
            days = (year%4==0 && year%100==0 && year%400==0) || (year%4==0 && year%100!=0) ? 28 : 29
        } else if (mouth == 1 || mouth == 3 || mouth == 5 || mouth == 7 || mouth == 8 || mouth == 10 || mouth == 12) {
            //   ：1,3,5,7,8,10,12  ，   .    31；
            days = 31
        } else {
            //    ，   ：30.
            days = 30
        }
        return days
    }

    /*        */
    getYearOfDay (time) {
        var firstDayYear = this.getFirstDayOfYear(time);
        var lastDayYear = this.getLastDayOfYear(time);
        var numSecond = (new Date(lastDayYear).getTime() - new Date(firstDayYear).getTime())/1000;
        return Math.ceil(numSecond/(24*3600));
    }

    /*        */
    getFirstDayOfYear (time) {
        var year = new Date(time).getFullYear();
        return year + "-01-01 00:00:00";
    }

    /*        */
    getLastDayOfYear (time) {
        var year = new Date(time).getFullYear();
        var dateString = year + "-12-01 00:00:00";
        var endDay = this.getMonthOfDay(dateString);
        return year + "-12-" + endDay + " 23:59:59";
    }

    /*              */
    getDayOfYear (time) {
        var firstDayYear = this.getFirstDayOfYear(time);
        var numSecond = (new Date(time).getTime() - new Date(firstDayYear).getTime())/1000;
        return Math.ceil(numSecond/(24*3600));
    }

    /*              */
    getDayOfYearWeek (time) {
        var numdays = this.getDayOfYear(time);
        return Math.ceil(numdays / 7);
    }

}