Can I custom datetime format like 'hh:ii' or 'hh:ii:ss'?

[gwsh1234]

{ ... format:'hh:ii' } I can set like this, and, also can get the right value. When I choose time again ,the time was set on 1899. How to resolve this problem ?

[AuspeXeu]

Can you provide a jsfiddle to illustrate this? https://jsfiddle.net/AuspeXeu/sqwwcjzu/