I am using jqwidgets-datetimeinput to display and input formatted date. It is working fine for most of the use cases but for the format d MMMM yyyy it is not behaving correctly.
it is showing as 6/11/2020 June 2020 instead of 11 June 2020
Interesting. I think you just found one of the many bugs/"features" that plague jqWidgets.
Upon further investigation, this seems to happen when d is the end of the format string, or is followed by a space character. To get around this, you can use a non-breaking space:
'd\u00a0MMMM yyyy'
If you're on Windows, you can also do Alt+0160 to type it out, but this may be unwise, as the two characters look identical.