JavaScript获取时间戳的坑

JavaScript获取时间戳的三个方法：

Date.parse(new Date())
获取13位时间戳，例如1553581293000，
(new Date()).valueOf()
获取13位时间戳，精确到毫秒，例如：1553581461549
new Date().getTime()。
获取13位时间戳，精确到毫秒，例如：1553581482325

示例

以上面第一种方法为例

<!DOCTYPE html>
<html><body><p id="demo">timestamp</p><button type="button" onclick="myFunction()">点击这里，显示时间戳</button><script>function myFunction() {document.getElementById("demo").innerHTML = Date.parse(new Date());}</script></body></html>

上述页面中的脚本执行后，会返回13位数字，如：1553581461549。parse方法会解析包含日期的字符串，并返回该日期与1970年1月1日午夜之间的毫秒数（UTC时间）。而上面parse解析的字符串是通过new Date()方法来获取到的，从下面的内容来看，new Date()获取的是一个当前主机的本地时间。

/** 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;
}interface DateConstructor {new(): Date;new(value: number | string): Date;new(year: number, month: number, date?: number, hours?: number, minutes?: number, seconds?: number, ms?: number): Date;(): string;readonly prototype: Date;/*** Parses a string containing a date, and returns the number of milliseconds between that date and midnight, January 1, 1970.* @param s A date string*/parse(s: string): number;/*** Returns the number of milliseconds between midnight, January 1, 1970 Universal Coordinated Time (UTC) (or GMT) and the specified date.* @param year The full year designation is required for cross-century date accuracy. If year is between 0 and 99 is used, then year is assumed to be 1900 + year.* @param month The month as an number between 0 and 11 (January to December).* @param date The date as an number between 1 and 31.* @param hours Must be supplied if minutes is supplied. An number from 0 to 23 (midnight to 11pm) that specifies the hour.* @param minutes Must be supplied if seconds is supplied. An number from 0 to 59 that specifies the minutes.* @param seconds Must be supplied if milliseconds is supplied. An number from 0 to 59 that specifies the seconds.* @param ms An number from 0 to 999 that specifies the milliseconds.*/UTC(year: number, month: number, date?: number, hours?: number, minutes?: number, seconds?: number, ms?: number): number;now(): number;
}

问题来了，一般服务器的时间是固定的，但是客户端且分布世界各地，客户端系统设置的时间也不一定按标准时区分布。因此就会造成通过JavaScript得到的时间戳不准确。

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JavaScript获取时间戳的坑

示例

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