日期轉秒數
===

## Ref.
[JavaScript Date parse()](https://www.fooish.com/javascript/date/parse.html)
[Epoch & Unix Timestamp Conversion Tools](https://www.epochconverter.com/)
[轉換時間, 分鐘 - Convertworld](https://www.convertworld.com/zh-hant/time/minutes.html)

###### tags: `實作相關`