The stat emblem of great britain

Flag days
The flag days directed by the DCMS include birthdays of members of the Royal Family, the wedding anniversary of the Monarch, Commonwealth Day, Accession Day, Coronation Day, The Queen's official birthday, Remembrance Sunday and on the days of the State Opening and prorogation of Parliament.
Since the beginning of 2013, the relevant days have been--

• 
  9 January: birthday of The Duchess of Cambridge
  
• 
  20 January: birthday of The Countess of Wessex
  
• 
  6 February: anniversary of The Queen's accession in 1952
  
• 
  19 February: birthday of The Duke of York
  
• 
  Second Sunday in March: Commonwealth Day
  
• 
  10 March: birthday of The Earl of Wessex
  
• 
  21 April: The Queen's birthday
  
• 
  9 May: Europe Day
  
• 
  2 June: anniversary of The Queen's 1953 coronation
  
• 
  10 June: birthday of Prince Philip, Duke of Edinburgh
  
• 
  A Saturday in June: The Queen's Official Birthday
  
• 
  21 June: birthday of The Duke of Cambridge
  
• 
  17 July: birthday of The Duchess of Cornwall
  
• 
  15 August: birthday of The Princess Royal
  
• 
  Second Sunday in November: Remembrance Sunday
  
• 
  14 November: birthday of The Prince of Wales
  
• 
  20 November: anniversary of the wedding of The Queen and The Duke of Edinburgh
  

In addition, the flag should be flown in the following areas on the specified days:

• 
  Wales – 1 March: Saint David's Day
  
• 
  Northern Ireland – 17 March: Saint Patrick's Day
  
• 
  England – 23 April: Saint George's Day
  
• 
  Scotland – 30 November: Saint Andrew's Day
  
• 
  Greater London: The day of the opening or proroguing of Parliament
  

Some non central government bodies still continue to follow the flag days.
In Scotland, the Scottish Government has decreed that the Flag of Scotland ("the Saltire") will fly on all its buildings every day from 8 am until sunset, but there is no specific policy on flying the Union Flag and as such it is sometimes flown alongside the Saltire and sometimes omitted. An exception is made for "national days". On these days, the Saltire shall be lowered and replaced with the Union Flag. These are the same as the flag days noted above with the exception of:

• 
  3 September: Merchant Navy Day
  

Another difference is that on Saint Andrew's Day, the Union Flag can only be flown if the building has more than one flagpole – the Saltire will not be lowered to make way for the Union Flag if there is only one flagpole.