LocalDateTime <-> Date

DateWrapper.java

import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.util.Date;
import java.util.function.Function;
import java.util.function.UnaryOperator;

public class DateWrapper {

    private LocalDateTime localDateTime;

    public DateWrapper(Date date) {
        this.localDateTime = LocalDateTime.ofInstant(date.toInstant(), ZoneOffset.systemDefault());
    }

    public DateWrapper(LocalDateTime localDateTime) {
        this.localDateTime = localDateTime;
    }

    public DateWrapper map(UnaryOperator<LocalDateTime> f) {
        this.localDateTime = f.apply(localDateTime);
        return this;
    }

    public Boolean is(Function<LocalDateTime, Boolean> f) {
        return f.apply(localDateTime);
    }

    public LocalDateTime toLocalDateTime() {
        return localDateTime;
    }

    public Date toDate() {
        return Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());
    }
}