Using buttons, you can move forward or backward in time, to go back to any date and time in the past and return to the current time.

通过按钮能够在时间上前移或后移，能够回到过去的任意时间点，并且能够回到当前的时间点。

youdao

The Ruby fragments in Rails templates define all kinds of visual and data-bound controls such as text entry fields buttons and date-time pickers.

Rails模板中的Ruby片段定义了各种可视化的以及数据绑定控件，例如文本框和日期选择器。

youdao