Single day events are sometimes displayed over two days

[hansthen]

Sometimes single day events are displayed as lasting two days.

For instance: the following json shows up on both Friday and Saturday.

{
  "categories": null,
  "color": "",
  "description": "Visit https://calendarlabs.com/holidays/us/good-friday.php to know more about Good Friday. \n\n Like us on Facebook: http://fb.com/calendarlabs to get updates",
  "end_date": "2023-04-08 00:00",
  "end_date_iso": "2023-04-08",
  "end_date_iso_0": "2023-04-08",
  "geo": null,
  "ical": "BEGIN:VEVENT\r\nSUMMARY:Good Friday\r\nDTSTART;VALUE=DATE:20230407\r\nDTEND;VALUE=DATE:20230407\r\nDTSTAMP:20221108T074931Z\r\nUID:636a0a0b6abb51667893771@calendarlabs.com\r\nSEQUENCE:0\r\nDESCRIPTION:Visit https://calendarlabs.com/holidays/us/good-friday.php to \r\n know more about Good Friday. \\n\\n Like us on Facebook: http://fb.com/calen\r\n darlabs to get updates\r\nLOCATION:India\r\nSTATUS:CONFIRMED\r\nTRANSP:TRANSPARENT\r\nEND:VEVENT\r\n",
  "id": [
    "636a0a0b6abb51667893771@calendarlabs.com",
    "2023-04-07 00:00"
  ],
  "location": "India",
  "recurrence": null,
  "sequence": "0",
  "start_date": "2023-04-07 00:00",
  "start_date_iso": "2023-04-07",
  "start_date_iso_0": "2023-04-07",
  "text": "Good Friday",
  "type": "event",
  "uid": "636a0a0b6abb51667893771@calendarlabs.com",
  "url": null
}

In the attached screenshot Good Friday, Easter Sunday and Easter Monday are all shown as lasting two days:

I used https://github.com/niccokunzmann/open-web-calendar with the provided ICS url (https://www.calendarlabs.com/ical-calendar/ics/46/Germany_Holidays.ics) to generate these screenshots. When I tried with https://www.calendarlabs.com/ical-calendar/ics/33/India_Holidays.ics I noticed that Holi (2023-03-08) was displayed correctly, but Ram Navami (2023-03-30) was not. See the attached screenshot.

[hansthen]

Can it be a problem with daylight saving time? I see that one day events in summer are spread over two days in the calendar. Perhaps the program interprets the start and end times as 01:00.