A worker with a monthly wage may be transferred to the category of day workers or workers appointed for a weekly, piece-meal or hourly wage, if the Worker agrees to this in writing, and without prejudice to the rights acquired by the worker during the period he spent working for monthly wage.
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UAE Labour Law (Decree-Law 33/2021)
Article 24: Transferring Monthly Wage Worker to Other Categories
Official English translation from the UAE Legislation portal. For interpretation and application, the original Arabic text prevails.