If you haven’t already done so, it’s time to update your project schedules with non-working days for 2015. Below is a list of commonly observed national and religious holidays, and the dates they are commonly observed.Naturally, you’ll need to confirm which holidays apply to your project team.
And here is a post with instructions for updating the working calendar in MS Project.
| Holiday | Weekday | Celebrated |
| New Year’s Day | Thursday | January 1 |
| Martin Luther King’s Birthday (US) | Monday | January 19 |
| Republic Day (India) | Monday | January 26 |
| Chinese / Vietnamese New Year | Thursday | February 19 |
| President’s Day (US) | Monday | February 16 |
| Ash Wednesday | Wednesday | February 18 |
| Beginning of Passover | Saturday | April 4 |
| Good Friday | Friday | April 3 |
| Easter Monday (UK) | Monday | April 6 |
| May Day (China) | Friday | May 1 |
| Early May Bank Holiday (UK) | Monday | May 4 |
| Victoria Day (Canada) | Monday | May 18 |
| Memorial Day (US) | Monday | May 25 |
| Spring Bank Holiday (UK) | Monday | May 25 |
| Shauvot | Monday | May 25 |
| First day of Ramadan | Thursday | June 18 |
| Canada Day | Wednesday | July 1 |
| Independence Day (US) | Saturday | July 4 |
| Independence Day (India) | Saturday | August 15 |
| Summer Bank Holiday (UK) | Monday | August 31 |
| Labor Day (US and Canada) | Monday | September 7 |
| Rosh Hashanah | Monday | September 14 |
| National Day (China) | Thursday | October 1 |
| Mahatma Gandhi’s Birthday (India) | Friday | October 2 |
| Yom Kippur | Wednesday | September 23 |
| Eid al-Adha / Festival of Sacrifice | Thursday | September 24 |
| Sukkot | Monday | September 28 |
| Columbus Day (US) | Monday | October 12 |
| Thanksgiving (Canada) | Monday | October 12 |
| Diwali (India) | Wednesday | November 11 |
| Veteran’s Day (US) / Remembrance Day (Canada) | Wednesday | November 11 |
| Thanksgiving Day (US) | Thursday | November 26 |
| Day after Thanksgiving (US) | Friday | November 27 |
| First day of Chanukah | Monday | December 7 |
| Christmas Eve | Thursday | December 24 |
| Christmas Day | Friday | December 25 |
| Boxing Day (UK, Canada) | Saturday | December 26 |