Christmas holiday follows the rules on remaining holiday and notice must therefore be given at minimum one month.
The Holiday Act contains specific rules concerning closure between Christmas and New Year. If a company is closed between Christmas and New Year, and the employee has earned more than 15 holiday days, it is the responsibility of the employer to "reserve" the number of holiday days equivalent to the days that the company is closed for Christmas.
If the employee has earned more than 15 holiday days, and the employer has forgotten to reserve a number of days for Christmas, the employer may generally not deduct these days in the salary.
If the employee has not earned 15 holiday days with the employer, the provision does not apply, and the days may be deducted in the employee's salary in accordance with the general rules on collective holiday closure.