Any difference between "90 days" and "3 months" in the visa-free requirement?

Any difference between "90 days" and "3 months" in the visa-free requirement? - Self Care Isn't Selfish Signage

In the visa-free requirement, some countries prescribe it as "within 90 days" while other countries prescribe it as "within 3 months".

For example: this is for US citizens but it prescribes Japan as "90 days" while Israel as "3 months".

While "90 days" is pretty obvious, how is the "3 months" calculated in this case? Is it the same as "90 days"? Or do you calculate it by adding +3 only to the month part of the date (e.g. from 2017-05-12 to 2017-08-12)? If it is November 29 or 30, how is it calculated?






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