/* ====================================== * * Date Class * * -------------------------------------- * * Written completely by Papanikitas * * Thanasis in the SoloLearn platform, * * using no external referencies, under * * the 'Tanasis' nickname. * * Anyone can use this class freely. * * -------------------------------------- * * Some methods: * * .getWeekDay() * * .getZodiac() * * .isEqual(Date) * * .isBefore(Date) * * .isAfter(Date) * * .isBetween(Date, Date) * * .dateAfterDays(int) * * .dateBeforeDays(int) * * .dateAfterMonths(int) * * .dateBeforeMonths(int) * * ====================================== */ public class Date { // Properties private String[] months = {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"}; private int day; private int month; private int year; private String weekDay; private Zodiac zodiac; // Constructor public Date(int day, int month, int year) { if(year < 0) { System.out.println("Error: Year can not be negative."); System.exit(0); } else if(month < 1 || month > 12) { System.out.println("Error: Month number must be between 1 and 12."); System.exit(0); } else if(!checkDay(day, month, year)) { System.out.println("Error: Day doesn't match with given month and year."); System.exit(0); } this.day = day; this.month = month; this.year = year; zellersRule(); zodiac = new Zodiac(day, month); } // Get the days of February based on the given year private int checkLeapYearForFebruary(int year) { if(year % 4 == 0) return 29; else return 28; } // Check if the day has a valid value private boolean checkDay(int day, int month, int year) { int[] mDays = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; mDays[1] = checkLeapYearForFebruary(year); if(day < 1 || day > mDays[month - 1]) return false; return true; } // Find the day of the week with Zeller's Rule private void zellersRule() { String[] days = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thirsday", "Friday", "Saturday"}; int k = day; int m = month - 2; if(m <= 0) m += 12; int D = year % 100; if(month == 1 || month == 2) D -= 1; int C = year / 100; int f = k + (((13 * m) - 1) / 5) + D + (D / 4) + (C / 4) - (2 * C); int x = f % 7; if(f < 0) x += 7; weekDay = days[x]; } // Getters public int getDay() { return day; } public int getMonth() { return month; } public int getYear() { return year; } public String getWeekDay() { return weekDay; } public String getZodiac() { return zodiac.getZodiac(); } // Setters public void setDay(int day) { this.day = day; zellersRule(); } public void setMonth(int month) { this.month = month; zellersRule(); } public void setYear(int year) { this.year = year; zellersRule(); } // Returns true if this and otherDate correspond to the same date, else false public boolean isEqual(Date otherDate) { return (day == otherDate.getDay() && month == otherDate.getMonth() && year == otherDate.getYear()); } // Returns true if this corresponds to an earlier date than otherDate public boolean isBefore(Date otherDate) { return (year < otherDate.getYear() || (year == otherDate.getYear() && (month < otherDate.getMonth() || (month == otherDate.getMonth() && day < otherDate.getDay())))); } // Returns true if this corresponds to a later date than otherDate public boolean isAfter(Date otherDate) { return (year > otherDate.getYear() || (year == otherDate.getYear() && (month > otherDate.getMonth() || (month == otherDate.getMonth() && day > otherDate.getDay())))); } public boolean isBetween(Date dateA, Date dateB) { return (this.isEqual(dateA) || this.isEqual(dateB) || (this.isAfter(dateA) && this.isBefore(dateB)) || (this.isAfter(dateB) && this.isBefore(dateA))); } // Returns 1 if this corresponds to an earlier date than otherDate, -1 if this corresponds to a later date than otherDate, or 0 if this and otherDate correspond to the same date public int compare(Date otherDate) { if(this.isBefore(otherDate)) return -1; else if(this.isAfter(otherDate)) return 1; else return 0; } // Gate the date after a number of days public Date dateAfterDays(int days) { int[] mDays = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; int d = day; int m = month; int y = year; mDays[1] = checkLeapYearForFebruary(y); while(days + d > mDays[m - 1]) { days -= mDays[m - 1]; if(m != 12) m++; else { m = 1; y++; mDays[1] = checkLeapYearForFebruary(y); } } d += days; return new Date(d, m, y); } // Get the date before a number of days public Date dateBeforeDays(int days) { int[] mDays = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; int d = day; int m = month; int y = year; mDays[1] = checkLeapYearForFebruary(y); while(d - days < 1) { int p; if(m == 1) p = 11; else p = m - 2; if(days < mDays[p]) { d = mDays[p] - (days - d); days = 0; } else days -= mDays[p]; if(m != 1) m--; else { m = 12; y--; mDays[1] = checkLeapYearForFebruary(y); } } d -= days; return new Date(d, m, y); } // Get the date after a number of weeks public Date dateAfterWeeks(int weeks) { return dateAfterDays(weeks * 7); } // Get the date before a number of weeks public Date dateBeforeWeeks(int weeks) { return dateBeforeDays(weeks * 7); } // Get the date after a number of months public Date dateAfterMonths(int months) { int[] mDays = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; int d = day; int m = month; int y = year; while(m + months > 12) { months -= 12; y++; } m += months; mDays[1] = checkLeapYearForFebruary(y); if(day > mDays[m - 1]) d = mDays[m - 1]; return new Date(d, m, y); } // Get the date before a number of months public Date dateBeforeMonths(int months) { int[] mDays = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; int d = day; int m = month; int y = year; while(m <= months) { months -= 12; y--; } m -= months; mDays[1] = checkLeapYearForFebruary(y); if(day > mDays[m - 1]) d = mDays[m - 1]; return new Date(d, m, y); } // Get the date after a number of years public Date dateAfterYears(int years) { return new Date(day, month, year + years); } // Get the date before a number of years public Date dateBeforeYears(int years) { return new Date(day, month, year - years); } // Return a string of this date public String toString() { return weekDay + ", " + day + " " + months[month - 1] + " " + year; } // Zodiac inner class protected class Zodiac { // Properties private String[] zodiacs = { "Aries", "Taurus", "Gemini", "Cancer", "Leo", "Virgo", "Libra", "Scorpio", "Sagittarius", "Capricorn", "Aquarius", "Pisces" }; private SimpleDate[][] zodiacDates = { { new SimpleDate(21, 3), new SimpleDate(20, 4) }, { new SimpleDate(21, 4), new SimpleDate(20, 5) }, { new SimpleDate(21, 5), new SimpleDate(21, 6) }, { new SimpleDate(22, 6), new SimpleDate(22, 7) }, { new SimpleDate(23, 7), new SimpleDate(22, 8) }, { new SimpleDate(23, 8), new SimpleDate(22, 9) }, { new SimpleDate(23, 9), new SimpleDate(23, 10) }, { new SimpleDate(24, 10), new SimpleDate(22, 11) }, { new SimpleDate(23, 11), new SimpleDate(21, 12) }, { new SimpleDate(22, 12), new SimpleDate(20, 1) }, { new SimpleDate(21, 1), new SimpleDate(19, 2) }, { new SimpleDate(20,2), new SimpleDate(20, 3) } }; private String zodiac; private int day; private int month; private SimpleDate date; // Constructor protected Zodiac(int day, int month) { this.day = day; this.month = month; date = new SimpleDate(day, month); setZodiac(date); } // Getters protected String getZodiac() { return zodiac; } protected int getDay() { return day; } protected int getMonth() { return month; } // Setters protected void setDay(int day) { this.day = day; date.setDay(day); setZodiac(date); } protected void setMonth(int month) { this.month = month; date.setMonth(month); setZodiac(date); } private void setZodiac(SimpleDate date) { for(int i = 0; i < 12; i++) { if(date.isBetween(zodiacDates[i][0], zodiacDates[i][1])) { zodiac = zodiacs[i]; break; } } } // SimpleDate inner class that holds day and month and has an 'isBetween' method protected class SimpleDate { // Properties private int day; private int month; // Constructor protected SimpleDate(int day, int month) { this.day = day; this.month = month; } // Getters protected int getDay() { return day; } protected int getMonth() { return month; } // Setters protected void setDay(int day) { this.day = day; } protected void setMonth(int month) { this.month = month; } // Returns true if the current date is equal with one or between date 'start' and date 'end' protected boolean isBetween(SimpleDate start, SimpleDate end) { if(month >= start.getMonth() && month <= end.getMonth()) { if(month == start.getMonth()) { if(day >= start.getDay()) return true; else return false; } else if(month == end.getMonth()) { if(day <= end.getDay()) return true; else return false; } else return true; } else return false; } } } }