The start date on the "NOTIFICATION LETTER OF FOREIGNER’S WORK PERMIT"
If the start date says a particular date eg. 1st June 2026 until 31st May 2027. Does that mean that you must only start on the 1st June or after?
You can't start work earlier than that, say the 26th May? (Or you're not expected to start earlier than that date.)
Is this your official confirmed 365 working days? This on the "NOTIFICATION LETTER OF FOREIGNER’S WORK PERMIT" before applying for the Z visa.