HarmonyOS 如何获取格式化的时间？

推荐使用第三方库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
  }
}

推荐使用三方库实现格式化，三方库的使用参考详情链接：

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