📅 最后修改于: 2020-12-18 05:03:30 🧑 作者: Mango
Date对象是JavaScript语言内置的数据类型。日期对象使用新的Date()创建，如下所示。
创建Date对象后，可以使用多种方法对其进行操作。大多数方法仅允许您使用本地时间或UTC(通用或GMT)时间来获取和设置对象的年，月，日，时，分，秒和毫秒字段。
ECMAScript标准要求Date对象必须能够在1970年1月1日之前或之后的1亿天内以毫秒精度表示任何日期和时间。范围是正负273,785年，因此JavaScript可以表示直到275755年的日期和时间。
您可以使用以下任何语法使用Date()构造函数创建Date对象。
new Date( )
new Date(milliseconds)
new Date(datestring)
new Date(year,month,date[,hour,minute,second,millisecond ])
注–括号中的参数始终是可选的。
这是参数的描述-
无参数-无参数，Date()构造函数创建一个Date对象，该对象设置为当前日期和时间。
毫秒-传递一个数字参数时，它将作为日期的内部数字表示，以毫秒为单位，由getTime()方法返回。例如，传递参数5000将创建一个表示1/1/70午夜之后五秒的日期。
datestring-传递一个字符串参数时，它是日期的字符串表示形式，其格式由Date.parse()方法接受。
7个要点-要使用上面显示的构造函数的最后一种形式。这是每个参数的描述-
年-代表年份的整数值。为了兼容性(为了避免Y2K问题)，应始终指定完整的年份；使用1998，而不是98。
month-代表月份的整数值，从1月的0到12月的11开始。
日期-表示该月的一天整数值。
小时-代表一天(24小时刻度)中的小时的整数值。
分钟-表示时间读数的分钟段的整数值。
第二-表示时间阅读的第二段的整数值。
毫秒-表示时间读数的毫秒段的整数值。
这是Date对象的属性及其描述的列表。
| Sr.No. | Property & Description |
|---|---|
| 1 | constructor
Specifies the function that creates an object’s prototype. |
| 2 | prototype
The prototype property allows you to add properties and methods to an object |
在以下各节中，我们将通过一些示例来演示不同Date属性的用法。
这是与Date一起使用的方法及其说明的列表。
| Sr.No. | Method & Description |
|---|---|
| 1 | Date()
Returns today’s date and time |
| 2 | getDate()
Returns the day of the month for the specified date according to local time. |
| 3 | getDay()
Returns the day of the week for the specified date according to local time. |
| 4 | getFullYear()
Returns the year of the specified date according to local time. |
| 5 | getHours()
Returns the hour in the specified date according to local time. |
| 6 | getMilliseconds()
Returns the milliseconds in the specified date according to local time. |
| 7 | getMinutes()
Returns the minutes in the specified date according to local time. |
| 8 | getMonth()
Returns the month in the specified date according to local time. |
| 9 | getSeconds()
Returns the seconds in the specified date according to local time. |
| 10 | getTime()
Returns the numeric value of the specified date as the number of milliseconds since January 1, 1970, 00:00:00 UTC. |
| 11 | getTimezoneOffset()
Returns the time-zone offset in minutes for the current locale. |
| 12 | getUTCDate()
Returns the day (date) of the month in the specified date according to universal time. |
| 13 | getUTCDay()
Returns the day of the week in the specified date according to universal time. |
| 14 | getUTCFullYear()
Returns the year in the specified date according to universal time. |
| 15 | getUTCHours()
Returns the hours in the specified date according to universal time. |
| 16 | getUTCMilliseconds()
Returns the milliseconds in the specified date according to universal time. |
| 17 | getUTCMinutes()
Returns the minutes in the specified date according to universal time. |
| 18 | getUTCMonth()
Returns the month in the specified date according to universal time. |
| 19 | getUTCSeconds()
Returns the seconds in the specified date according to universal time. |
| 20 | getYear()
Deprecated – Returns the year in the specified date according to local time. Use getFullYear instead. |
| 21 | setDate()
Sets the day of the month for a specified date according to local time. |
| 22 | setFullYear()
Sets the full year for a specified date according to local time. |
| 23 | setHours()
Sets the hours for a specified date according to local time. |
| 24 | setMilliseconds()
Sets the milliseconds for a specified date according to local time. |
| 25 | setMinutes()
Sets the minutes for a specified date according to local time. |
| 26 | setMonth()
Sets the month for a specified date according to local time. |
| 27 | setSeconds()
Sets the seconds for a specified date according to local time. |
| 28 | setTime()
Sets the Date object to the time represented by a number of milliseconds since January 1, 1970, 00:00:00 UTC. |
| 29 | setUTCDate()
Sets the day of the month for a specified date according to universal time. |
| 30 | setUTCFullYear()
Sets the full year for a specified date according to universal time. |
| 31 | setUTCHours()
Sets the hour for a specified date according to universal time. |
| 32 | setUTCMilliseconds()
Sets the milliseconds for a specified date according to universal time. |
| 33 | setUTCMinutes()
Sets the minutes for a specified date according to universal time. |
| 34 | setUTCMonth()
Sets the month for a specified date according to universal time. |
| 35 | setUTCSeconds()
Sets the seconds for a specified date according to universal time. |
| 36 | setYear()
Deprecated – Sets the year for a specified date according to local time. Use setFullYear instead. |
| 37 | toDateString()
Returns the “date” portion of the Date as a human-readable string. |
| 38 | toGMTString()
Deprecated – Converts a date to a string, using the Internet GMT conventions. Use toUTCString instead. |
| 39 | toLocaleDateString()
Returns the “date” portion of the Date as a string, using the current locale’s conventions. |
| 40 | toLocaleFormat()
Converts a date to a string, using a format string. |
| 41 | toLocaleString()
Converts a date to a string, using the current locale’s conventions. |
| 42 | toLocaleTimeString()
Returns the “time” portion of the Date as a string, using the current locale’s conventions. |
| 43 | toSource()
Returns a string representing the source for an equivalent Date object; you can use this value to create a new object. |
| 44 | toString()
Returns a string representing the specified Date object. |
| 45 | toTimeString()
Returns the “time” portion of the Date as a human-readable string. |
| 46 | toUTCString()
Converts a date to a string, using the universal time convention. |
| 47 | valueOf()
Returns the primitive value of a Date object. |
使用通用时间约定将日期转换为字符串。
除了前面列出的许多实例方法外，Date对象还定义了两个静态方法。这些方法是通过Date()构造函数本身调用的。
| Sr.No. | Method & Description |
|---|---|
| 1 | Date.parse( )
Parses a string representation of a date and time and returns the internal millisecond representation of that date. |
| 2 | Date.UTC( )
Returns the millisecond representation of the specified UTC date and time. |
在以下各节中，我们将通过一些示例来演示Date Static方法的用法。