Immutable DateTime
Date object is not immutable, and also modifying it is little complicated. There is no TimeSpan equivalent in JavaScript. So this library was created to provide DateTime/TimeSpan similar to .NET.
I know about moment-js, but I needed something very simpler.
Features
- Immutable DateTime
- Support for TimeSpan (differences between dates)
- Simple Add/Difference
- Support for properties (year, month, day, hour, minute, second .. all are readonly properties)
- Backward compatibility with JavaScript's Date
Compatibility with Date
In order to make usage simple, you can pass DateTime to any method that uses Date and everything will still work. To prevent intellisense from listing all Date's methods, we have used a hack to create new Date object in constructor of DateTime.
For easy access, all to*String methods of Date are available in intellisense.
const d = DateTime.now();
console.log(d instance of Date); // prints true..
console.log(d instance of DateTime); // prints true..
// however intellisense does not
// show up Date methods
d.year
This library does not pollute Date's prototype, logically DateTime is a new class and has its own way of functioning.
Json Parser
You will have to hook some code to change prototype of Date objects sent through JSON.parse. d.prototype = DateTime.prototype.
Usage
Properties
Year, Month, Day, Hour, Minute, Second and Millisecond are all properties.
// now is a readonly property which returns new
// instance of DateTime of current system time
const d = DateTime.now;
console.log(`${d.year}-${d.month}-${d.day}`);
Trim Time
const d = DateTime.now;
// returns new instance of DateTime
// with time part trimmed...
const day = d.date;
TimeSpan
const d = DateTime.now;
// t is of type TimeSpan
const t = d.time;
console.log(t); // prints 10.00 PM (local time)
Difference in TimeSpan
const d1 = new DateTime(2010, 1, 1);
const d2 = new DateTime(2012, 1, 1);
// returns TimeSpan
const diff = d2.diff(d1);
// prints 730
console.log(diff.totalDays);
Add TimeSpan
const t = TimeSpan.fromDays(2);
const d1 = new DateTime(2010, 1, 1);
const d2 = d1.add(t);
// prints 2010-01-03
console.log(d2);
Type Information
export default class DateTime {
static get today(): DateTime;
static get utcNow(): DateTime;
static get now(): DateTime;
static parse(s: string): DateTime;
get hour(): number;
get minute(): number;
get second(): number;
get millisecond(): number;
get day(): number;
get dayOfWeek(): number;
get month(): number;
get year(): number;
get timeZoneOffset(): TimeSpan;
get msSinceEpoch(): number;
/** Strips time of the day and returns Date only */
get date(): DateTime;
get asJSDate(): Date;
get time(): TimeSpan;
constructor();
constructor(time?: number | string);
constructor(year?: number,
month?: number, date?: number, hours?: number,
minutes?: number, seconds?: number, ms?: number);
add(d: DateTime | TimeSpan): DateTime;
add(days: number, hours?: number, minutes?: number,
seconds?: number, milliseconds?: number): DateTime;
addMonths(m: number): DateTime;
addYears(y: number): DateTime;
diff(rhs: Date | DateTime): TimeSpan;
equals(d: DateTime): boolean;
// for easy access, following methods
// are available on intellisense
toLocaleString (locales?: string | string[],
options?: Intl.DateTimeFormatOptions): string;
toLocaleDateString (locales?: string | string[],
options?: Intl.DateTimeFormatOptions): string;
toLocaleTimeString (locales?: string | string[],
options?: Intl.DateTimeFormatOptions): string;
toUTCString(): string;
toISOString(): string;
toJSON(key?: any): string;
toTimeString(): string;
toDateString(): string;
}
@web-atoms/date-time
Immutable DateTime library for Web Atoms in JavaScript similar to .Net DateTime and TimeSpan
Features
- Immutable DateTime
- Support for TimeSpan (differences between dates)
- Simple Add/Difference
- Support for properties
- Support for Comparison
- Support for
valueOfwhich makes it easier to compare and sort dates - Backward compatibility with JavaScript's Date
Compatibility
In order to make usage simple, you can pass DateTime to any method that uses Date and everything will still work. To prevent intellisense from listing all Date's methods, we have used a hack to create new Date object in constructor of DateTime.
For easy access, all to*String methods of Date are available in intellisense.
const d = DateTime.now();
console.log(d instance of Date); // prints true..
// however intellisense does not
// show up for Date methods except for toLocaleDateString etc
d.year
Usage
Properties
Year, Month, Day…
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