[英]date-fns | format date
I have below function that formats date string.我有以下格式化日期字符串的函数。
import { format, parseISO } from "date-fns";
export function convertDate(myDate, displayFormat) {
return format(new Date(parseISO(myDate)), displayFormat);
}
I have articles that has content such as我的文章包含以下内容
title: 'My title'
date: '2022-01-04'
I call the convertDate
function using below:我使用以下调用convertDate
函数:
if (articles) {
for (let i = 0; i < articles.length; i++) {
const year = convertDate(articles[i].date, "y");
years.push(year);
}
uniqueYear = [...new Set(years)];
}
My timezone is CEST.我的时区是 CEST。
I can call the function by using {convertDate(article.date, "PPP")}
which also works.我可以使用同样有效的{convertDate(article.date, "PPP")}
来调用该函数。
Please help!请帮忙!
Running the following minimal example at runkit.com returns "2022", it doesn't throw the error described in the OP:在runkit.com上运行以下最小示例会返回“2022”,它不会抛出 OP 中描述的错误:
var dateFns = require("date-fns")
function convertDate(myDate, displayFormat) {
return dateFns.format(new Date(dateFns.parseISO(myDate)), displayFormat);
}
let articles = [{
title: 'My title',
date: '2022-01-04'
}];
convertDate(articles[0].date, "y"); // "2022"
So the error is elsewhere.所以错误在别处。
Also, the use of new Date is redundant:此外,使用new Date是多余的:
dateFns.format(dateFns.parseISO(myDate), displayFormat)
is sufficient and more robust.是足够的和更健壮的。
As suggested elsewhere, getting the year from the timestamp can be done using string manipulation, no need for casting to a Date .正如其他地方所建议的那样,可以使用字符串操作来从时间戳中获取年份,而无需转换为Date 。 To get the years:要获得年份:
let articles = [{title: 'title 0', date: '2022-01-04'}, {title: 'title 1', date: '2020-01-04'}]; let years = articles.map(o => o.date.substring(0,4)); console.log(years);
If you need it as a Date for other things (eg formatted month name), cast it to a Date once and reuse it.如果您需要它作为其他事物的日期(例如格式化的月份名称),请将其转换为日期并重用它。
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