Typescriptの日付の種類は？

Question

TypeScriptで日付を表現するにはどうすればよいですか？日付はTypeScript typeではないので、anyまたはobjectを使用しますか？

let myDate: any = new Date(); 

私はそれほど単純な質問ではありますが、Googleで多くを見つけることができませんでした。

Answer 1

答えはタイプDateで、超簡単である：

const d: Date = new Date(); // but the type can also be inferred from "new Date()" already 

それは他のすべてのオブジェクトのインスタンスと同じである:)

Answer 2

任意のクラスまたはインタフェースが活字体でタイプとして使用することができます。 DateをDateConstructorインターフェースによって参照内部活字体オブジェクトであるとして

const date = new Date(); 

は既にdate型定義について知っているであろう。

そして、あなたが使用コンストラクタのために、次のように定義されますあなたが使用することができ、それがより明確にするために

interface DateConstructor { 
    new(): Date; 
    ... 
} 

、：

const date: Date = new Date(); 

あなたがが型定義を欠落している可能性があり、 Dateは、私の例ではES6ライブラリから来ていて、私のtsconfig.jsonで定義しています。

"compilerOptions": { 
    "target": "ES6", 
    "lib": [ 
     "es6", 
     "dom" 
    ], 

希望するバージョンのJavaScriptをターゲットにするように、これらの設定を調整することができます。タイプはTSで働く

/** Enables basic storage and retrieval of dates and times. */ 
interface Date { 
    /** Returns a string representation of a date. The format of the string depends on the locale. */ 
    toString(): string; 
    /** Returns a date as a string value. */ 
    toDateString(): string; 
    /** Returns a time as a string value. */ 
    toTimeString(): string; 
    /** Returns a value as a string value appropriate to the host environment's current locale. */ 
    toLocaleString(): string; 
    /** Returns a date as a string value appropriate to the host environment's current locale. */ 
    toLocaleDateString(): string; 
    /** Returns a time as a string value appropriate to the host environment's current locale. */ 
    toLocaleTimeString(): string; 
    /** Returns the stored time value in milliseconds since midnight, January 1, 1970 UTC. */ 
    valueOf(): number; 
    /** Gets the time value in milliseconds. */ 
    getTime(): number; 
    /** Gets the year, using local time. */ 
    getFullYear(): number; 
    /** Gets the year using Universal Coordinated Time (UTC). */ 
    getUTCFullYear(): number; 
    /** Gets the month, using local time. */ 
    getMonth(): number; 
    /** Gets the month of a Date object using Universal Coordinated Time (UTC). */ 
    getUTCMonth(): number; 
    /** Gets the day-of-the-month, using local time. */ 
    getDate(): number; 
    /** Gets the day-of-the-month, using Universal Coordinated Time (UTC). */ 
    getUTCDate(): number; 
    /** Gets the day of the week, using local time. */ 
    getDay(): number; 
    /** Gets the day of the week using Universal Coordinated Time (UTC). */ 
    getUTCDay(): number; 
    /** Gets the hours in a date, using local time. */ 
    getHours(): number; 
    /** Gets the hours value in a Date object using Universal Coordinated Time (UTC). */ 
    getUTCHours(): number; 
    /** Gets the minutes of a Date object, using local time. */ 
    getMinutes(): number; 
    /** Gets the minutes of a Date object using Universal Coordinated Time (UTC). */ 
    getUTCMinutes(): number; 
    /** Gets the seconds of a Date object, using local time. */ 
    getSeconds(): number; 
    /** Gets the seconds of a Date object using Universal Coordinated Time (UTC). */ 
    getUTCSeconds(): number; 
    /** Gets the milliseconds of a Date, using local time. */ 
    getMilliseconds(): number; 
    /** Gets the milliseconds of a Date object using Universal Coordinated Time (UTC). */ 
    getUTCMilliseconds(): number; 
    /** Gets the difference in minutes between the time on the local computer and Universal Coordinated Time (UTC). */ 
    getTimezoneOffset(): number; 
    /** 
     * Sets the date and time value in the Date object. 
     * @param time A numeric value representing the number of elapsed milliseconds since midnight, January 1, 1970 GMT. 
     */ 
    setTime(time: number): number; 
    /** 
     * Sets the milliseconds value in the Date object using local time. 
     * @param ms A numeric value equal to the millisecond value. 
     */ 
    setMilliseconds(ms: number): number; 
    /** 
     * Sets the milliseconds value in the Date object using Universal Coordinated Time (UTC). 
     * @param ms A numeric value equal to the millisecond value. 
     */ 
    setUTCMilliseconds(ms: number): number; 

    /** 
     * Sets the seconds value in the Date object using local time. 
     * @param sec A numeric value equal to the seconds value. 
     * @param ms A numeric value equal to the milliseconds value. 
     */ 
    setSeconds(sec: number, ms?: number): number; 
    /** 
     * Sets the seconds value in the Date object using Universal Coordinated Time (UTC). 
     * @param sec A numeric value equal to the seconds value. 
     * @param ms A numeric value equal to the milliseconds value. 
     */ 
    setUTCSeconds(sec: number, ms?: number): number; 
    /** 
     * Sets the minutes value in the Date object using local time. 
     * @param min A numeric value equal to the minutes value. 
     * @param sec A numeric value equal to the seconds value. 
     * @param ms A numeric value equal to the milliseconds value. 
     */ 
    setMinutes(min: number, sec?: number, ms?: number): number; 
    /** 
     * Sets the minutes value in the Date object using Universal Coordinated Time (UTC). 
     * @param min A numeric value equal to the minutes value. 
     * @param sec A numeric value equal to the seconds value. 
     * @param ms A numeric value equal to the milliseconds value. 
     */ 
    setUTCMinutes(min: number, sec?: number, ms?: number): number; 
    /** 
     * Sets the hour value in the Date object using local time. 
     * @param hours A numeric value equal to the hours value. 
     * @param min A numeric value equal to the minutes value. 
     * @param sec A numeric value equal to the seconds value. 
     * @param ms A numeric value equal to the milliseconds value. 
     */ 
    setHours(hours: number, min?: number, sec?: number, ms?: number): number; 
    /** 
     * Sets the hours value in the Date object using Universal Coordinated Time (UTC). 
     * @param hours A numeric value equal to the hours value. 
     * @param min A numeric value equal to the minutes value. 
     * @param sec A numeric value equal to the seconds value. 
     * @param ms A numeric value equal to the milliseconds value. 
     */ 
    setUTCHours(hours: number, min?: number, sec?: number, ms?: number): number; 
    /** 
     * Sets the numeric day-of-the-month value of the Date object using local time. 
     * @param date A numeric value equal to the day of the month. 
     */ 
    setDate(date: number): number; 
    /** 
     * Sets the numeric day of the month in the Date object using Universal Coordinated Time (UTC). 
     * @param date A numeric value equal to the day of the month. 
     */ 
    setUTCDate(date: number): number; 
    /** 
     * Sets the month value in the Date object using local time. 
     * @param month A numeric value equal to the month. The value for January is 0, and other month values follow consecutively. 
     * @param date A numeric value representing the day of the month. If this value is not supplied, the value from a call to the getDate method is used. 
     */ 
    setMonth(month: number, date?: number): number; 
    /** 
     * Sets the month value in the Date object using Universal Coordinated Time (UTC). 
     * @param month A numeric value equal to the month. The value for January is 0, and other month values follow consecutively. 
     * @param date A numeric value representing the day of the month. If it is not supplied, the value from a call to the getUTCDate method is used. 
     */ 
    setUTCMonth(month: number, date?: number): number; 
    /** 
     * Sets the year of the Date object using local time. 
     * @param year A numeric value for the year. 
     * @param month A zero-based numeric value for the month (0 for January, 11 for December). Must be specified if numDate is specified. 
     * @param date A numeric value equal for the day of the month. 
     */ 
    setFullYear(year: number, month?: number, date?: number): number; 
    /** 
     * Sets the year value in the Date object using Universal Coordinated Time (UTC). 
     * @param year A numeric value equal to the year. 
     * @param month A numeric value equal to the month. The value for January is 0, and other month values follow consecutively. Must be supplied if numDate is supplied. 
     * @param date A numeric value equal to the day of the month. 
     */ 
    setUTCFullYear(year: number, month?: number, date?: number): number; 
    /** Returns a date converted to a string using Universal Coordinated Time (UTC). */ 
    toUTCString(): string; 
    /** Returns a date as a string value in ISO format. */ 
    toISOString(): string; 
    /** Used by the JSON.stringify method to enable the transformation of an object's data for JavaScript Object Notation (JSON) serialization. */ 
    toJSON(key?: any): string; 
}