护照有效期计算

PassportUtil.kt

import java.util.*

/**
 * Created by AifeiI on 2019/7/19.
 */
object LeapYearUtil {
fun getDateByAddYears(basicDate: Date, years: Int): Date {
        val calendar = Calendar.getInstance()
        calendar.time = basicDate

        val basicYear = calendar[Calendar.YEAR]
        val basicMonth = calendar[Calendar.MONTH]
        val basicDay = calendar[Calendar.DAY_OF_MONTH]

        var leapYearCounter = 0
        for (i in 0 until years + 1) {
            val theYear = basicYear + i
            if (isLeapYear(theYear)) {
                leapYearCounter++
                println("Leap Year: $theYear")
            }
        }

        if (isLeapYear(basicYear)) {
            if (basicMonth > 1) {
                leapYearCounter--
            }
        }

        if (isLeapYear(basicYear + years)) {
            if (basicMonth < 1 || (basicMonth == 1 && basicDay < 28)) {
                leapYearCounter--
            }
        }

        val days = 365 * years + leapYearCounter
        val newTimestamp = calendar.timeInMillis + (days * 24 * 60 * 60 * 1000L)
        calendar.timeInMillis = newTimestamp

        return calendar.time
    }
    
    fun isLeapYear(year: Int): Boolean {
        return (year % 4 == 0 && year % 100 != 0) || year % 400 == 0
    }
}