如何将Date对象格式化为字符串?
当前回答
要获得“2010年8月10日”,请尝试:
var date = new Date('2010-08-10 00:00:00');
date = date.toLocaleDateString(undefined, {day:'2-digit'}) + '-' + date.toLocaleDateString(undefined, {month:'short'}) + '-' + date.toLocaleDateString(undefined, {year:'numeric'})
有关浏览器支持,请参阅toLocaleDateString。
其他回答
你不需要任何图书馆。只需提取日期组件并构造字符串。以下是如何获取YYYY-MM-DD格式。还要注意月份指数“一月是0,二月是1,依此类推。”
// @flow
type Components = {
day: number,
month: number,
year: number
}
export default class DateFormatter {
// YYYY-MM-DD
static YYYY_MM_DD = (date: Date): string => {
const components = DateFormatter.format(DateFormatter.components(date))
return `${components.year}-${components.month}-${components.day}`
}
static format = (components: Components) => {
return {
day: `${components.day}`.padStart(2, '0'),
month: `${components.month}`.padStart(2, '0'),
year: components.year
}
}
static components = (date: Date) => {
return {
day: date.getDate(),
month: date.getMonth() + 1,
year: date.getFullYear()
}
}
}
DateFormatter.formatDate(新日期(2010,7,10),'DD-MMM-YYYY')
=>2010年8月10日
DateFormatter.formatDate(new Date(),'YYYY-MM-DD HH:MM:ss')
=>2017-11-22 19:52:37
DateFormatter.formatDate(新日期(2005,1,2,3,4,5),'D DD DDD DDD,M MM MMM MMMM,YY YYYY,h hh h hh,M MM,s ss,a a')
=>2002年2月2日星期三2005年2月5日,2003年3月3日,4月4日,5月5日上午
var日期格式设置工具={月份名称:[“一月”,“二月”,“三月”,“四月”,“五月”,“六月”,“七月”、“八月”、“九月”、“十月”、“十一月”、“十二月”],dayName:[“星期日”、“星期一”、“周二”、“周三”、“周四”、“周五”、“周六”],formatDate:函数(日期,格式){var self=this;format=self.getProperDigits(format,/d+/gi,date.getDate());format=self.getProperDigits(格式,/M+/g,date.getMonth()+1);format=format.replace(/y+/gi,函数(y){var len=y.length;var year=date.getFullYear();如果(长度==2)return(年份+“”).sslice(-2);否则如果(len==4)回归年;返回y;})format=self.getProperDigits(格式,/H+/g,date.getHours());format=self.getProperDigits(格式,/h+/g,self.getHours12(date.getHours()));format=self.getProperDigits(format,/m+/g,date.getMinutes());format=self.getProperDigits(format,/s+/gi,date.getSeconds());format=format.replace(/a/ig,函数(a){var amPm=self.getAmPm(date.getHours())如果(a==“a”)返回amPm.toUpperCase();返回amPm;})format=self.getFullOr3Letters(format,/d+/gi,self.dayNames,date.getDay())format=self.getFullOr3Letters(format,/M+/g,self.monthNames,date.getMonth())返回格式;},getProperDigits:函数(格式、正则表达式、值){return format.replace(正则表达式,函数(m){var长度=m.length;如果(长度==1)返回值;否则如果(长度==2)return(“0”+值).sslice(-2);返回m;})},getHours12:函数(小时){// https://stackoverflow.com/questions/10556879/changing-the-1-24-hour-to-1-12-hour-for-the-gethours-method返回(小时+24)%12||12;},getAmPm:函数(小时){// https://stackoverflow.com/questions/8888491/how-do-you-display-javascript-datetime-in-12-hour-am-pm-format回程时间>=12?'下午':'上午';},getFullOr3Letters:函数(格式,正则表达式,名称数组,值){return format.replace(正则表达式,函数){var len=s.length;如果(长度==3)return nameArray[value].substr(0,3);否则如果(len==4)return nameArray[value];返回s;})}}console.log(DateFormatter.formatDate(new Date(),'YYYY-MM-DD HH:MM:ss'));console.log(DateFormatter.formatDate(new Date(),'D DD DDD DDDD,M MM MMM MMMM,YY YYYY,h hh h hh,M MM,s ss,a a'));console.log(DateFormatter.formatDate(新日期(2005,1,2,3,4,5),'D DD DDD DDDD,M MM MMM MMMM,YY YYYY,h hh h hh,M MM,s ss,a a'));
格式描述取自Ionic Framework(它不支持Z、UTC时区偏移)
未彻底测试
函数convert_month(i=0,option=“num”){//i=索引变量对象月=[{num:01,短:“Jan”,长:“Janer”},{num:02,短:“Feb”,长:“Februari”},{num:03,短:“Mar”,长:“March”},{num:04,短:“Apr”,长:“April”},{num:05,短:“May”,长:“May”},{num:06,短:“Jun”,长:“Juni”},{num:07,短:“Jul”,长:“July”},{num:08,短:“Aug”,长:“August”},{num:09,短:“Sep”,长:“Sept”},{num:10,短:“Oct”,长:“Octo”},{num:11,短:“Nov”,长:“十一月”},{num:12,短:“Dec”,长:“十二月”}];返回object_months[i][option];}var d=新日期();// https://stackoverflow.com/questions/1408289/how-can-i-do-string-interpolation-in-javascriptvar num=`${d.getDate()}-${convert_month(d.getMonth())}--${d.getFullYear()}';var short=`${d.getDate()}-${convert_month(d.getMonth(),“short”)}-${d.getFullYear()}`;var long=`${d.getDate()}-${convert_month(d.getMonth(),“long”)}-${d.getFullYear()}`;document.querySelector(“#num”).innerHTML=num;document.querySelector(“#short”).innerHTML=短;document.querySelector(“#long”).innerHTML=long;<p>数字:<span id=“num”></span>(默认值)</p><p>短:<span id=“Short”></span></p><p>长:<span id=“Long”></span></p>
我们有很多解决方案,但我认为最好的是Moment.js。所以我个人建议将Moment.jss用于日期和时间操作。
console.log(moment().format('DD-MMM-YYYY'));<script src=“//cdnjs.cloudflare.com/ajax/libs/ment.js/2.14.1/moment.min.js”></script>
一个简单的函数,可以返回日期、日期+时间或仅返回时间:
var myDate = dateFormatter("2019-01-24 11:33:24", "date-time");
// >> RETURNS "January 24, 2019 11:33:24"
var myDate2 = dateFormatter("2019-01-24 11:33:24", "date");
// >> RETURNS "January 24, 2019"
var myDate3 = dateFormatter("2019-01-24 11:33:24", "time");
// >> RETURNS "11:33:24"
function dateFormatter(strDate, format){
var theDate = new Date(strDate);
if (format=="time")
return getTimeFromDate(theDate);
else{
var dateOptions = {year:'numeric', month:'long', day:'numeric'};
var formattedDate = theDate.toLocaleDateString("en-US", + dateOptions);
if (format=="date")
return formattedDate;
return formattedDate + " " + getTimeFromDate(theDate);
}
}
function getTimeFromDate(theDate){
var sec = theDate.getSeconds();
if (sec<10)
sec = "0" + sec;
var min = theDate.getMinutes();
if (min<10)
min = "0" + min;
return theDate.getHours() + ':'+ min + ':' + sec;
}