Is it possible to specify formats for data types from Python/JupyterLab?

[dhirschfeld]

...and if so how?

I'm particularly interested in how to specify the format of datetimes (xref: #1442):

I'd like to show it in iso-format with no time component - is my only option casting to string in Python with strftime before passing to perspective?

I'd also like to be able to configure displaying commas in large ints and including leading-zeros (fixed-width).

If this is possible I'd be happy to open a docs PR to give some examples for other users.

[dhirschfeld]

I tried the strftime('%Y-%m-%d') from Python but it appears that perspective (by default) recognises that as a date-string and casts it back to a mdy date type!