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

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
  }
}

三方库的下载使用参考链接：

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