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Employee is entitled to full 21-days gratuity pay. Get the 1/3 of this figure (1-3 years); 2/3 of the figure (3-5 years) to get the total gratuity pay. 
Article 132 -

As amended by Article 132 Federal Law no . 12 dated 29/10/1986 :

The worker having spent one year or more in continuous service shall be entitled to an end of service gratuity upon the termination of his service . The days of absence from work without pay shall not be included in the calculation of the period of service , and the gratuity shall be calculated as follows :

1 - The wage of twenty one days for each of the first five years of service .

2 - The wage of thirty days for every additional year .

Always provided that the total gratuity does not exceed the wage of two years .

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