I added the US Holidays subscription. On the Zoho online calendar, all the US Holidays show on the correct dates throughout the year.

But, when the US Holidays calendar is synced to CalDAV clients (in read only mode), several US Holidays appear on incorrect dates.

The CalDAV clients I used are:

- The iPad iOS Calendar

- Thunderbird Lightning Calendar

-  The eM Calendar client

January

Birthday of Martin Luther King :

Zoho Calendar: Mon 20 Jan

CalDAV clients: Sat 18 Jan

February

Washington's Birthday:

Zoho Calendar: Mon 17 Feb

CalDAV clients: Sat 15 Feb

March

Daylight Savings Time:

Zoho Calendar: Sun 8 Mar

CalDAV clients: Sat 14 Mar

May

Mother's Day:

Zoho Calendar: Sun 10 May

CalDAV clients: Sat 9 May

Memorial Day:

Zoho Calendar: Mon 25 May

CalDAV clients: Sat 30 May

June

Father's Day:

Zoho Calendar: Sun 21 Jun

CalDAV clients: Fri 19 Jun

September

Labor Day:

Zoho Calendar: Mon 7 Sep

CalDAV clients: Tue 1 Sep

November

Daylight Savings Time:

Zoho Calendar: Sun 1 Nov

CalDAV clients: Fri 6 Nov

Thanksgiving:

Zoho Calendar: Thu 26 Nov

CalDAV clients: Tue 24 Nov