Once the new Ramadan begins, its fasts have a fixed current time. Earlier missed fasts are not used to displace the present month’s obligatory fasting.
The sequence is: observe the current Ramadan, then discharge the remaining earlier make-up. Nothing in this order cancels the old missed days.
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Kitab al-Sawm: Illness, Travel, Make-up Fasts and Delayed Qaḍāʾ
Once the new Ramadan begins, its fasts have a fixed current time. Earlier missed fasts are not used to displace the present month’s obligatory fasting.
The sequence is: observe the current Ramadan, then discharge the remaining earlier make-up. Nothing in this order cancels the old missed days.