var date = function (date) {
var obj = {
_value: null,
get value() {
return this+"";
},
init: function(date) {
if(date instanceof Date) this._value = date;
else {
var arr = date.split(/[\s:-]/);
this._value = new Date(Date.UTC(arr[0], arr[1] - 1, arr[2], arr[3], arr[4]));
}
return this;
},
add: function(value, type) {
if (value > 0 && type in this.method) {
return this.setValue(value, this.method[type]);
} else {
throw new TypeError("Передано неверное значение");
}
},
subtract: function(value, type) {
if (value > 0 && type in this.method) {
return this.setValueSubtract(value, this.method[type]);
} else {
throw new TypeError("Передано неверное значение");
}
},
method: {
"years": "FullYear",
"months": "Month",
"days": "Date",
"hours": "Hours",
"minutes": "Minutes"
},
setValue: function(value, method) {
this._value['setUTC' + method](value + this._value['getUTC' + method]());
return this;
},
setValueSubtract: function(value, method) {
this._value['setUTC' + method](-value + this._value['getUTC' + method]());
return this;
},
valueOf: function() {
var year = this._value.getFullYear();
var month = this._value.toLocaleString("ru",{timeZone : "UTC",month: '2-digit'});
var day = this._value.toLocaleString("ru",{timeZone : "UTC",day: '2-digit'});
var time = this._value.toLocaleString("ru",{timeZone : "UTC", hour: '2-digit', minute: '2-digit' });
var dates = year + "-" + month + "-" + day + " " + time;
return dates;
},
toString: this.valueOf,
};
return obj.init(date);
};
var time = date('2017-05-16 13:45')
.add(24, 'hours')
.subtract(1, 'months')
.add(3, 'days')
.add(15, 'minutes');
var time2 = date("2017-04-20 14:00");
alert(time);
alert(time == "2017-04-20 14:00");
alert(time+"" == time2+"");
console.log('time.value:', time.value);
console.log('time2:', time2);
Материалы для изучения:
https://learn.javascript.ru/object-conversion
https://learn.javascript.ru/descriptors-getters-setters
P.S.: хз, ответил я на вопрос или нет, но больше ничем помочь не могу.
