In Denmark, April 9 is an official flag day. It was on this date in 1940 that Denmark was invaded by Nazi Germany. To commemorate the beginning of the German occupation and mourn the Danes who died in World War II, Dannebrog is flown at half mast – but only until 12 o’clock. After noon the flag is flown at full mast to symbolize that Denmark became free again.
In Denmark, flags are fown from 8:00 a.m. but no earlier than sunrise. Flags may not be flown after sunset. For at little over two months in the winter, the sun rises later than 8 o’clock in the morning. Anyone in charge of hoisting a flag will have to check the astronomical data in an almanac or calendar.
In Copenhagen on April 9, the sun rises at 6:20 a.m. and sets 13 hours and 45 minutes later. The person in charge of hoisting the Dannebrog on April 9 should to do so at 8:00 a.m. The flag must be taken down no later than 08:05 p.m.
Whenever the flag is flown at half mast it should first be hoisted to the top of the flagstaff for an instant before being lowered. At half mast the distance between the upper edge of the flag and the top of the flagstaff is about one third of the total height of the flagstaff.
On April 9, the day of commeration of the Wehrmacht invasion of Denmark, the rule is to first fly the flag at half mast, then to hoist the flag to full mast at noon. This is done to celebrate the eventual liberation of Denmark from German rule in 1945 and to honour the heroes of the Danish Resistance. If a two-minute silence is observed at noon, the flag is hoisted to full mast at 12:02 p.m.
In 2017, April 9 is Palm Sunday. Unlike Easter Sunday, Palm Sunday is not an official flag day in Denmark. In 2023 Easter Sunday will fall on April 9. Therefore, in six years time something unusual will occur on April 9 in that the flag will be flown at full mast all day. The reason for this is that official ecclesiastical flag days supersede other flag days.
In the Church of Denmark it is customary for the Dannebrog to be flown outside churches during services. The flag is flown at full mast unless their is a funeral service in which case the flag is flown at half mast. So, if a service is conducted on Palm Sunday between 10:00 a.m. and 11:15 a.m. (for example) the flag needs to be hoisted to full mast during that time. For the person in charge of flags outside a Danish church April 9 will be quite a busy day!
IN DANISH: I Danmark hejses flaget kl. 8.00, dog ikke tidligere end solopgang. Flaget nedhales senest ved solnedgang. Når der flages på halv stang, hejses Dannebrog først helt til tops, hvorefter det nedhales til halv stang. 9. april er en officiel flagdag i Danmark til minde om den tyske besættelse i 1940 og de faldne under krigen. Der flages på halv stang til middag, hvorefter der flages på hel stang resten af dagen. Palmesøndag er ikke en officiel flagdag. I folkekirken er det kutyme i forbindelse med gudstjenester at flage på fuld stang foran kirken.