Timestamp time zone conversion and Decimal conversion and Longitude and latitude distance calculation

[yangtongbing]

What type of request is this?

New tool idea

Clear and concise description of the feature you are proposing

Date conversion for different time zones with the same timestamp, Decimal conversion, Longitude and latitude distance calculation

Is their example of this tool in the wild?

https://www.wakatool.com/timestamp
https://tool.oschina.net/hexconvert
https://www.box3.cn/tools/lbs.html

Additional context

No response

Validations

• Check the feature is not already implemented in the project.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.
• Check that the feature can be implemented in a client side only app (IT-Tools is client side only, no server).