I usually use the Google Calendar or Thunderbird calendar on my computers, tablet, phone....
Decided to check out the Windows 10 Calendar app, and it's showing Christ mas Eve as the 23rd, Christmas day as the 24th, and boxing day as the 25th. New Years eve 30th Dec, New Years day 31st Dec, day after New Year as 1st Jan. On two computers, and Tablet running Win 10 with all updates. Windows phone calendar is fine as it's Windows 8.1
Anyone else seeing this?