项目中需要用到日期的格式转化及相关的加减，根据需要的情况，整理了部分方法。并列出date的构造方法及方法以作记录。
一、以下是根据小程序demo中util.js文件修改的
const formatTime = date => {
const year = date.getFullYear()
const month = date.getMonth() + 1
const day = date.getDate()
const hour = date.getHours()
const minute = date.getMinutes()
const second = date.getSeconds()
return [year, month, day].map(formatNumber).join('/') + ' ' + [hour, minute, second].map(formatNumber).join(':')
}
//获取当前日期，以“/”连接
const formatDate = date => {
const year = date.getFullYear()
const month = date.getMonth() + 1
const day = date.getDate()
return [year, month, day].map(formatNumber).join('/')
}
//获取当前日期，以“-”连接
const formatDateByH = date => {
const year = date.getFullYear()
const month = date.getMonth() + 1
const day = date.getDate()
return [year, month, day].map(formatNumber).join('-')
}
//将string格式日期转换为“/”连接只包含月日的日期
const formatDateToSimple = data => {
var date = new Date(Date.parse(data));
const month = date.getMonth() + 1
const day = date.getDate()
return [month, day].join('/')
}
//获取string格式日期的星期
const formatDateToWeek = data => {
var date = new Date(Date.parse(data));
const month = date.getDay();
var weekDay ;
switch (month){
case 0:
weekDay = '周日';
break;
case 1:
weekDay = '周一';
break;
case 2:
weekDay = '周二';
break;
case 3:
weekDay = '周三';
break;
case 4:
weekDay = '周四';
break;
case 5:
weekDay = '周五';
break;
case 6:
weekDay = '周六';
break
}
return weekDay;
}
//日期的加减
const addDay = data => {
//下面的不是时间戳，是时间戳*1000
var timestamp = Date.parse(new Date());
var newTimestamp = timestamp + data * 24 * 60 * 60 * 1000;
var date = new Date(newTimestamp);
const year = date.getFullYear();
const month = date.getMonth() + 1;
const day = date.getDate();
return [year, month, day].map(formatNumber).join('-');
}
//月份的加减
const addMonth = num => {
if(typeof num == "string"){
num = parseInt(num);
}
var date = new Date();
const curYear = date.getFullYear();
const curMonth = date.getMonth() + 1;
const curDay = date.getDate();
let month = (curMonth + num - 1) % 12;
let year = curYear + (curMonth + num - month)/12;
let days = curDay;
date = new Date(year, month, days);
year = date.getFullYear();
month = date.getMonth() + 1;
const day = date.getDate();
return [year, month, day].map(formatNumber).join('-')
}
//月份第几天增加后获取月份的第几天
const getDayByAddDay = data => {
//下面的不是时间戳，是时间戳*1000
var timestamp = Date.parse(new Date());
var newTimestamp = timestamp + data * 24 * 60 * 60 * 1000;
var date = new Date(newTimestamp);
return date.getDate();
}
const formatNumber = n => {
n = n.toString()
return n[1] ? n : '0' + n
}
module.exports = {
formatTime: formatTime,
formatDate: formatDate,
formatDateByH: formatDateByH,
addDay: addDay,
addMonth: addMonth,
getDayByAddDay: getDayByAddDay,
formatDateToSimple: formatDateToSimple,
formatDateToWeek: formatDateToWeek,
}二、主要用到函数Date。
1、构造函数
interface DateConstructor {
new(): Date;
new(value: number): Date;
new(value: 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;
}2、Date的方法
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;
}三、博客推荐
下面文章方面比较全面，可以看看：
JavaScript Date（日期）对象