CNV, one of the Netherlands' largest trade unions, supports recognizing a Muslim holiday. The union thinks for example of replacing Easter Monday or Whit Monday with Eid ul-Fitr or Eid ul-Adha.
Vice President of CNV, Rienk van Splunder, wants to see a recognized Muslim holiday soon despite the opposition he expects from Christian circles. "The holiday in the Netherlands stem from the Christian tradition."
FNV, another trade union doesn't think it realistic since not many Muslims are members of a trade union. Both union hope that Muslim employees will sign up to existing unions.
Both unions oppose a Muslim trade union. Though if such a union would be established, they are both ready to work together.
Last year CNV called Whit Monday a great good and didn't want to exchange it with Eid ul-Fitr. The union said then that religions would be set against each other if a free day would be replaced.
Source: nu.nl (Dutch)