I was afraid that I'll lose track too because I don't pay much attention to what day it is, but it turned out to be easy. The days that I can eat in the morning feel very different from those that I can't. But if it doesn't work for you you can eat in the morning on even dates and in the evening on the odd ones. A skip on month change is going to be insignificant and will result in shortening of a single fasting window per month at most.

By the way, if you are close to your healthy weight when doing this aim to reduce your weight so that your BMI is between 22.5 and 25. This is the area of lowest mortality. There's no point to go lower.

Once you get there you can either abandon alternating, shorten fasting window or just lessen restrictions on fasting periods like allowing eating certain type of foods, like raw vegetables or fruits or nuts so that your weight is maintained.