HarmonyOS 时间戳格式化

目前HarmonyOS 没有直接格式化的api，针对时间戳格式化现有两种解决方案：

第一种：自定义方法获取时间戳内的年月日小时分钟秒，然后进行字符串的拼接返回。完整代码如下：

import systemDateTime from '@ohos.systemDateTime';
import { BusinessError } from '@ohos.base';

@Entry
@Component
struct Index5 {
  @State timeStr : string = '';
  build() {
    Flex(
      { direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
      Text(`当前时间：`+this.timeStr)
        .fontSize(20)
        .fontWeight(FontWeight.Bold)
      Button("get time")
        .width(100)
        .height(100).onClick(()=>{
        //同步方法获取系统时间戳
        try {
          let time = systemDateTime.getTime(false)
          this.timeStr = this.getTimeToYYYYDDMMHHMMSS(time)
        }catch (e){
          let error = e as BusinessError;
          console.info(`Failed to get time. message: ${error.message}, code: ${error.code}`);
        }
        //异步方法获取系统时间戳
        try {
          systemDateTime.getCurrentTime(false,(error,time)=>{
            if (error) {
              console.info(`Failed to get currentTime. message: ${error.message}, code: ${error.code}`)
              return;
            }
            console.info(`Succeeded in getting currentTime : ${time}`);
            this.timeStr = this.getTimeToYYYYDDMMHHMMSS(time)
          })
          AlertDialog.show({message:'sss'});
        }catch (e){
          console.info(`Failed to get currentTime. message: ${e.message}, code: ${e.code}`);
        }
      })
    }
    .width('100%')
    .height('100%') }

  //将时间戳转换成日期格式
  getTimeToYYYYDDMMHHMMSS(str: number): string {
    let time: string = "";
    console.log(str.toString())
    let date = new Date(str);
    console.log(JSON.stringify(date))
    try {
      let year = date.getFullYear();
      let month = (date.getMonth() + 1) < 10 ? "0" + (date.getMonth() + 1) : (date.getMonth() + 1);
      let day = date.getDate() < 10 ? "0" + date.getDate() : date.getDate();
      let hour = date.getHours() < 10 ? "0" + date.getHours() : date.getHours();
      let min = date.getMinutes() < 10 ? "0" + date.getMinutes() : date.getMinutes
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.
49.
50.
51.
52.
53.
54.
55.

第二种使用第三方库dayjs，完整代码如下：

import dayjs from "dayjs";

@Entry
@Component
struct Index {
  @State timeStr : number = 1318781876;
  @State timeNow: string = ''
  build() {
    Row() {
      Column() {
        Text(`当前时间：`+this.timeNow)
          .fontSize(20)
          .fontWeight(FontWeight.Bold)
          .width("100%")
        Button("get time")
          .onClick(() => {
            try {
              this.timeNow = this.getTimeToYYYYDDMMHHMMSS(this.timeStr)
            }
            catch (e) {
            }
          })
      }
      .justifyContent(FlexAlign.Center)
      .width('100%')
    }
    .height('100%')
  }

  getTimeToYYYYDDMMHHMMSS(str: number): string {
    let time:string =''
    time = dayjs.unix(1318781876).format('YYYY-MM-DD HH:mm:ss')
    return time
  }
}
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.

三方库的下载使用参考链接：

https://gitee.com/openharmony-tpc/openharmony_tpc_samples/tree/master/dayjs