Flags at Half Staff

If you fly a flag at your home, or if there's one where you work, it should be flown at half staff today for Peace Officers Memorial Day.

[/end PSA]

 

Is there an official site for when a flag is to be flown at half-staff? I see them flying at half-staff a lot often wonder why it's being flown at half-staff for a particular day.

 

HalfStaff.org has a calendar, but they don't seem to update it. There is a list at the bottom of the calendar page, though:

• By order of the President of The United States
• By order of the Governor of your state
• Peace Officers Memorial Day, May 15th (sunrise until sunset)*
• Memorial Day, last Monday in May (sunrise until NOON)
• Patriot Day, September 11 (sunrise until sunset)
• Korean War Veterans Armistice Day (sunrise until sunset)**
• National Firefighters Memorial Day (sunrise until sunset)**
• Pearl Harbor Remembrance Day, December 7th (sunrise to sunset)

*Exception: When the 15th of May falls on the THIRD Saturday in May (Armed Forces Day) the flag shall NOT be flown at half staff.

**Note: I didn't know about these days... and there's no date, so I don't know when on the calendar they fall. I'm sure I could look it up, but I'm about to leave work, so maybe later...