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DateTime.ts
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DateTime.ts
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/*!
* @author electricessence / https://github.com/electricessence/
* Based on .NET DateTime's interface.
* Licensing: MIT https://github.com/electricessence/TypeScript.NET/blob/master/LICENSE.md
*/
import {ICalendarDate, ITimeStamp} from "./ITimeStamp";
import {TimeSpan} from "./TimeSpan";
import {ClockTime} from "./ClockTime";
import {Milliseconds} from "./HowMany";
import {TimeStamp} from "./TimeStamp";
import {IDateTime} from "./IDateTime";
import {Gregorian} from "./Calendars";
import {ITimeQuantity} from "./ITimeQuantity";
import {IEquatable} from "../IEquatable";
import {IComparable} from "../IComparable";
import {ArgumentNullException} from "../Exceptions/ArgumentNullException";
const VOID0:undefined = void 0;
export class DateTime implements ICalendarDate, IDateTime, IEquatable<IDateTime>, IComparable<IDateTime>
{
private readonly _value:Date;
toJsDate():Date
{
return new Date(this._value.getTime()); // return a clone.
}
constructor();
constructor(dateString:string, kind?:DateTime.Kind);
constructor(milliseconds:number, kind?:DateTime.Kind);
constructor(source:Date, kind?:DateTime.Kind);
constructor(source:DateTime, kind?:DateTime.Kind);
constructor(value:any = new Date(), kind:DateTime.Kind = DateTime.Kind.Local)
{
this._kind = kind;
if(value instanceof DateTime)
{
this._value = value.toJsDate();
if(kind===VOID0) this._kind = value._kind;
}
else { // noinspection SuspiciousInstanceOfGuard
if(value instanceof Date)
this._value = new Date(value.getTime());
else
this._value = value===VOID0
? new Date()
: new Date(value);
}
}
private readonly _kind:DateTime.Kind;
get kind():DateTime.Kind
{
return this._kind;
}
get year():number
{
return this._value.getFullYear();
}
/**
* Returns the Gregorian Month (zero indexed).
* @returns {number}
*/
get month():Gregorian.Month
{
return this._value.getMonth();
}
/**
* Returns the month number (1-12).
* @returns {number}
*/
get calendarMonth():number
{
return this._value.getMonth() + 1;
}
get calendar():ICalendarDate
{
return {
year: this.year,
month: this.calendarMonth,
day: this.day
}
}
/**
* Returns the day of the month. An integer between 1 and 31.
* @returns {number}
*/
get day():number
{
return this._value.getDate();
}
/**
* Returns the day of the month indexed starting at zero.
* @returns {number}
*/
get dayIndex():number
{
return this._value.getDate() - 1;
}
/**
* Returns the zero indexed day of the week. (Sunday == 0)
* @returns {number}
*/
get dayOfWeek():Gregorian.DayOfWeek
{
return this._value.getDay();
}
addMilliseconds(ms:number):DateTime
{
ms = ms || 0;
return new DateTime(this._value.getTime() + ms, this._kind);
}
addSeconds(seconds:number):DateTime
{
seconds = seconds || 0;
return this.addMilliseconds(seconds*Milliseconds.Per.Second);
}
addMinutes(minutes:number):DateTime
{
minutes = minutes || 0;
return this.addMilliseconds(minutes*Milliseconds.Per.Minute);
}
addHours(hours:number):DateTime
{
hours = hours || 0;
return this.addMilliseconds(hours*Milliseconds.Per.Hour);
}
addDays(days:number):DateTime
{
days = days || 0;
return this.addMilliseconds(days*Milliseconds.Per.Day);
}
addMonths(months:number):DateTime
{
months = months || 0;
const d = this.toJsDate();
d.setMonth(d.getMonth() + months);
return new DateTime(d, this._kind);
}
addYears(years:number):DateTime
{
years = years || 0;
const d = this.toJsDate();
d.setFullYear(d.getFullYear() + years);
return new DateTime(d, this._kind);
}
/**
* Receives an ITimeQuantity value and adds based on the total milliseconds.
* @param {ITimeQuantity} time
* @returns {DateTime}
*/
add(time:ITimeQuantity):DateTime
{
return this.addMilliseconds(time.getTotalMilliseconds());
}
/**
* Receives an ITimeQuantity value and subtracts based on the total milliseconds.
* @param {ITimeQuantity} time
* @returns {DateTime}
*/
subtract(time:ITimeQuantity):DateTime
{
return this.addMilliseconds(-time.getTotalMilliseconds());
}
/**
* Returns a TimeSpan representing the amount of time between two dates.
* @param previous
* @returns {TimeSpan}
*/
timePassedSince(previous:Date|DateTime):TimeSpan
{
return DateTime.between(previous, this);
}
/**
* Returns a DateTime object for 00:00 of this date.
*/
get date():DateTime
{
const _ = this;
return new DateTime(
new Date(
_.year,
_.month,
_.day
)
, _._kind
);
}
private _time:ClockTime|undefined;
/**
* Returns the time of day represented by a ClockTime object.
* @returns {ClockTime}
*/
get timeOfDay():ClockTime
{
const _ = this;
let t = _._time;
if(!t)
{
const d = this._value;
_._time = t = new ClockTime(
d.getHours(),
d.getMinutes(),
d.getSeconds(),
d.getMilliseconds());
}
return t;
}
/**
* Returns a readonly object which contains all the date and time components.
*/
toTimeStamp():ITimeStamp
{
return TimeStamp.from(this);
}
/**
* Returns the now local time.
* @returns {DateTime}
*/
static get now():DateTime
{
return new DateTime();
}
/**
* Returns a UTC version of this date if its kind is local.
* @returns {DateTime}
*/
toUniversalTime():DateTime
{
const _ = this;
if(_._kind!=DateTime.Kind.Local)
return new DateTime(_, _._kind);
const d = _._value;
return new DateTime(
new Date(
d.getUTCFullYear(),
d.getUTCMonth(),
d.getUTCDate(),
d.getUTCHours(),
d.getUTCMinutes(),
d.getUTCSeconds(),
d.getUTCMilliseconds()
),
DateTime.Kind.Utc
);
}
/**
* Compares a JS Date with the current instance. Does not evaluate the kind.
* @param other
* @returns {boolean}
*/
equals(other:Date):boolean
/**
* Compares another IDateTime object and returns true if they or their value are equal.
* @param other The other IDateTime object.
* @param strict When strict is true, the 'kind' also must match.
* @returns {boolean}
*/
equals(other:IDateTime, strict?:boolean):boolean
equals(other:IDateTime | Date, strict:boolean = false):boolean
{
if(!other) return false;
if(other==this) return true;
if(other instanceof Date)
{
let v = this._value;
return other==v || other.getTime()==v.getTime();
}
if(other instanceof DateTime)
{
if(strict)
{
let ok = other._kind;
if(!ok && this._kind || ok!=this._kind) return false;
}
return this.equals(other._value);
}
else if(strict)
return false;
return this.equals(other.toJsDate());
}
// https://msdn.microsoft.com/en-us/library/System.IComparable.CompareTo(v=vs.110).aspx
compareTo(other:IDateTime | Date):number
{
if(!other) throw new ArgumentNullException("other");
if(other==this) return 0;
if(other instanceof DateTime)
{
other = other._value;
}
const ms = this._value.getTime();
if(other instanceof Date)
{
return ms - other.getTime();
}
return ms - other.toJsDate().getTime();
}
equivalent(other:IDateTime | Date):boolean
{
if(!other) return false;
if(other==this) return true;
if(other instanceof Date)
{
let v = this._value;
// TODO: What is the best way to handle this when kinds match or don't?
return v.toUTCString()==other.toUTCString();
}
if(other instanceof DateTime)
{
if(this.equals(other, true)) return true;
}
return this.equivalent(other.toJsDate());
}
/**
* The date component for now.
* @returns {DateTime}
*/
static get today():DateTime
{
return DateTime.now.date;
}
/**
* Midnight tomorrow.
* @returns {DateTime}
*/
static get tomorrow():DateTime
{
const today:DateTime = DateTime.today;
return today.addDays(1);
}
/**
* Measures the difference between two dates as a TimeSpan.
* @param first
* @param last
*/
static between(first:Date|DateTime, last:Date|DateTime):TimeSpan
{
const f:Date = first instanceof DateTime ? first._value : <Date>first,
l:Date = last instanceof DateTime ? last._value : <Date>last;
return new TimeSpan(l.getTime() - f.getTime());
}
/**
* Calculates if the given year is a leap year using the formula:
* ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)
* @param year
* @returns {boolean}
*/
static isLeapYear(year:number):boolean
{
return ((year%4==0) && (year%100!=0)) || (year%400==0);
}
/**
* Returns the number of days for the specific year and month.
* @param year
* @param month
* @returns {any}
*/
static daysInMonth(year:number, month:Gregorian.Month):number
{
// Basically, add 1 month, subtract a day... What's the date?
return (new Date(year, month + 1, 0)).getDate();
}
static from(calendarDate:ICalendarDate):DateTime;
static from(year:number, month:Gregorian.Month, day:number):DateTime;
static from(
yearOrDate:number|ICalendarDate,
month:number = 0,
day:number = 1):DateTime
{
let year:number;
if(typeof yearOrDate=="object")
{
day = (<ICalendarDate>yearOrDate).day;
month = (<ICalendarDate>yearOrDate).month;
year = (<ICalendarDate>yearOrDate).year;
}
else
{
year = yearOrDate;
}
return new DateTime(new Date(year, month, day));
}
static fromCalendarDate(calendarDate:ICalendarDate):DateTime;
static fromCalendarDate(year:number, month:number, day:number):DateTime;
static fromCalendarDate(
yearOrDate:number|ICalendarDate,
month:number = 1,
day:number = 1):DateTime
{
let year:number;
if(typeof yearOrDate=="object")
{
day = (<ICalendarDate>yearOrDate).day;
month = (<ICalendarDate>yearOrDate).month;
year = (<ICalendarDate>yearOrDate).year;
}
else
{
year = yearOrDate;
}
return new DateTime(new Date(year, month - 1, day));
}
}
// Extend DateTime's usefulness.
export module DateTime
{
export enum Kind {
Unspecified,
Local,
Utc,
}
}
Object.freeze(DateTime);
export default DateTime;