ISO_datestr.java

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package com.scottishseafarms.particle_track;

import java.util.Arrays;

/**
 * Only works for years 1993 - 2023
 * @author SA02MB
 */
public class ISO_datestr {
    private int day;
    private int month;
    private int year;
    private int[][] monthDays = new int[][]{{1,31},{2,28},{3,31},{4,30},{5,31},{6,30},{7,31},{8,31},{9,30},{10,31},{11,30},{12,31}};
    private final int[] leapYears = new int[]{1992,1996,2000,2004,2008,2012,2016,2020,2024,2028,2032};
    
    public ISO_datestr(int inDay, int inMonth, int inYear)
    {
        this.day = inDay;
        this.month = inMonth;
        this.year  = inYear;

        for (int i = 0; i < this.leapYears.length; i++) 
        {
            if(this.leapYears[i]==inYear)
            {
                monthDays[1][1]=29;
            }
        }
     }
    
    public ISO_datestr(String dateString)
    {
        this.year = Integer.parseInt(dateString.substring(0, 4));
        this.month= Integer.parseInt(dateString.substring(4, 6));
        this.day = Integer.parseInt(dateString.substring(6, 8));
        
        for (int i = 0; i < this.leapYears.length; i++) 
        {
            if(this.leapYears[i]==this.year)
            {
                monthDays[1][1]=29;
            }
        }
    }

    public String getDateStr()
    {
       String dateStr = String.format("%04d", this.year) + String.format("%02d", this.month) + String.format("%02d", this.day);   
       return dateStr;
    }

    public int getDateNum()
    {
        // date integer with ref point year 1992, well why ever not?
        int yearDaysTot = (this.year - 1992)*365;
        int leapYearDaysTot = (int)Math.floor((this.year - 1992)/4) + 1;
        int monthDaysTot = 0;
        if (this.month >1)
        {
            for(int i=0; i<=month-2;i++)
            {
                monthDaysTot = monthDaysTot + monthDays[i][1];       
            }
        }
        int dateNum =yearDaysTot + leapYearDaysTot + monthDaysTot + this.day;
        return dateNum;
    }

    public void addDay()
    {
        if(this.day == this.monthDays[this.month -1][1])
           {this.day = 1;

            if(this.month==12)
            {this.month = 1;
             this.year++;
             boolean isLeapYear = false;
               for (int i = 0; i < this.leapYears.length; i++) {
                if(this.leapYears[i]==this.year)
                {isLeapYear=true;}
                }
               if(isLeapYear)
               {monthDays[1][1]=29;}
               else
               {monthDays[1][1]=28;}
            }           
            else
            {this.month++;}      
           }
        else{this.day++;} 
    }
    
    public static ISO_datestr getTomorrow(ISO_datestr today)
    {
        ISO_datestr tomorrow = new ISO_datestr(today.getDay(),today.getMonth(),today.getYear());
        if(tomorrow.day == tomorrow.monthDays[tomorrow.month -1][1])
        {
            tomorrow.day = 1;

            if(tomorrow.month==12)
            {
                tomorrow.month = 1;
                tomorrow.year++;
                boolean isLeapYear = false;
                for (int i = 0; i < tomorrow.leapYears.length; i++) 
                {
                    if(tomorrow.leapYears[i]==tomorrow.year)
                    {
                        isLeapYear=true;
                    }
                }
                if(isLeapYear)
                {
                    tomorrow.monthDays[1][1]=29;
                }
                else
                {
                    tomorrow.monthDays[1][1]=28;
                }
            }           
            else
            {
                tomorrow.month++;
            }      
        }
        else
        {
            tomorrow.day++;
        } 
        return tomorrow;
    }

    public static ISO_datestr getYesterday(ISO_datestr today)
    {
        ISO_datestr yesterday = new ISO_datestr(today.getDay(),today.getMonth(),today.getYear());
        // If first of month, need to set day to be last day of previous month
        if(yesterday.day == 1)
        {
            if(yesterday.month==1)
            {
                yesterday.month = 12;
                yesterday.year--;
                boolean isLeapYear = false;
                for (int i = 0; i < yesterday.leapYears.length; i++) 
                {
                    if(yesterday.leapYears[i]==yesterday.year)
                    {
                        isLeapYear=true;
                    }
                }
                if(isLeapYear)
                {
                    yesterday.monthDays[1][1]=29;
                }
                else
                {
                    yesterday.monthDays[1][1]=28;
                }
            }           
            else
            {
                yesterday.month--;
            }  
            yesterday.day=yesterday.monthDays[yesterday.month -1][1];
        }
        else
        {
            yesterday.day--;
        } 
        return yesterday;
    }

    
    public void takeDay()
    {
        if(this.day == 1)
           {if(this.month==1)
            {this.month = 12;
             this.day = this.monthDays[this.month -1][1];
             this.year--;
             boolean isLeapYear = false;
               for (int i = 0; i < this.leapYears.length; i++) {
                if(this.leapYears[i]==this.year)
                {isLeapYear=true;}
                }
               if(isLeapYear)
               {monthDays[1][1]=29;}
               else
               {monthDays[1][1]=28;}
            }           
            else
            {this.month--;
             this.day = this.monthDays[this.month][1];
            }      
           }
        else{this.day--;} 
    }

    public int getYear()
    {
        return year;
    }
    public int getMonth()
    {
        return month;
    }
    public int getDay()
    {
        return day;
    }
    
        /**
     * work out the date from an integer in format YYYYMMDD - Mike Bedington
     * method
     *
     * @param ymd
     * @return
     */
    public static int[] dateIntParse(int ymd) {
        double start_ymd_mod = (double) (ymd);
        int startYear = (int) Math.floor(start_ymd_mod / 10000);
        start_ymd_mod = start_ymd_mod - startYear * 10000;
        int startMonth = (int) Math.floor(start_ymd_mod / 100);
        start_ymd_mod = start_ymd_mod - startMonth * 100;
        int startDay = (int) start_ymd_mod;

        int[] output = new int[]{startDay, startMonth, startYear};
        return output;
    }

}