Modern Calendar not showing times and dates correctly

[Jean5288]

Help! 

I have added a modern calendar to our site but am having a couple of issues with it.  The first is that week long or multi-day events are not showing for the entire period.  For example, New Hire training for a week is showing correctly when you open the event.  But on the calendar it's only showing up on the last day.  Do we have to enter the event on each date or is there a way to show the span of time?

  

The second issue is that when you hover over an event it shows the start and end time as the same time, for example 11 AM to 11 AM instead of 11 AM to 12PM.  Sorry, no screen shots of that.

I have searched here pretty much all day and used Google, but not finding anything on this problem.

[#2]

@Jean5288 Which modern calendar web part are you using? Can you provide reference link to modern calendar web part?

Also, when you fetch the list items using API calls, the date time value maybe different than your local time as it depends on the regional settings of SharePoint site & UTC time difference.

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[#3]

@ganeshsanap 

I imported a list (from an older calendar) updated the formatting and then created a calendar view, then added conditional formatting for the instructors as this is for the training team.  Previous versions allowed us to show a week for a training session.

The site is set for Central US time (as are all the hubs and the upper level sites), though I'm not sure how that would cause it to show 11AM to 11 AM for the time of the course instead of 11 AM to 12 PM.