Day of the Year LeetCode solution in Java

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class Solution {
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  public int dayOfYear(String date) {
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    int[] months = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
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    int year =
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        (date.charAt(0) - 48) * 1000
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            + (date.charAt(1) - 48) * 100
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            + (date.charAt(2) - 48) * 10
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            + date.charAt(3)
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            - 48;
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    if (year % 4 == 0 && year != 1900) {
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      months[1]++;
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    }
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    int ans = 0;
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    for (int i = 0; i < ((date.charAt(5) - 48) * 10) + date.charAt(6) - 48 - 1; i++) {
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      ans += months[i];
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    }
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    ans += (date.charAt(8) - 48) * 10 + date.charAt(9) - 48;
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    return ans;
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  }
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}