Calculate the number of days from today until the next occurrence of a birthday given a birth date. If today is the birthday, return 0. Always return the days to the next future birthday.

Examples:

Input: birthDate = Date.newInstance(1990, 7, 15), today = Date.newInstance(2025, 7, 1) Output: 14 Explanation: Birthday is July 15, which is 14 days from July 1 Input: birthDate = Date.newInstance(2000, 3, 1), today = Date.newInstance(2025, 3, 1) Output: 0 Explanation: Today is the birthday Input: birthDate = Date.newInstance(1985, 1, 10), today = Date.newInstance(2025, 12, 20) Output: 21 Explanation: Next birthday is January 10 of the following year
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