Return the next date without using any java library
In this article, we will give a date and after a given day our program return the next date without using any java library.
Objective: After giving a date will show the next date
Basically, this problem will divide into the 3 major parts. We know 12 months a year.
- 7 months consist of 31 days (January, March, May, July, August, October and December)
- 4 months consist of 30 days (April, June, September and November)
- February month consist of 28 days (29 days if leap year)
First, check the input values
- If the year is less than 1812 or greater than 2022 or
- If the month is less than 1 or greater than 12 or
- If the day is less than 1 or greater than 31
If one of these conditions is true, then the return on this date is out of the range. Otherwise, execute the else condition. First, increase day + 1 and store in the newday.
- If the month is (1, 3, 5, 7, 8, 10, 12) and day is greater than 31 then, set newday = 1 and month++
- If the month is (4, 6, 9, 11) and day is greater than 30 then, set newday = 1 and month++
- Otherwise, this month is February, check given year is a leap year or not. If the month is a leap year and day is greater than 29 then, set newDay = 1 and month++. Else day is greater than 28 then, set newDay = 1 and month++.
- If the month is greater 12 then, set month = 1 and year++
- Finally, return the newDay
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 | import java.util.Scanner; public class FindNextDate { public String getNextDate(int year, int month, int day) { String[] invalidMeg = new String[] { "Invalid data", "Out of the range..."}; if ((year < 1812 || year > 2022) || (month < 1 || month > 12) || (day < 1 || day > 31)) { return invalidMeg[1]; //Out of the range } else { int newDay = day + 1; String nextDay = ""; if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) { if (day > 31) { return invalidMeg[0]; //Invalid data } if (newDay > 31) { newDay = 1; month++; } } else if (month == 4 || month == 6 || month == 9 || month == 11) { if (day > 30) { return invalidMeg[0]; //Invalid data } if (newDay > 30) { newDay = 1; month++; } } else { if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) { if (day > 29) { return invalidMeg[0]; //Invalid data } if (newDay > 29) { newDay = 1; month++; } } else { if (day > 28) { return invalidMeg[0]; //Invalid data } if (newDay > 28) { newDay = 1; month++; } } } if (month > 12) { month = 1; year++; } nextDay += year + "-" + month + "-" + newDay; return nextDay; } } public static void main(String[] args) { int year, month, day; Scanner input = new Scanner(System.in); System.out.println("Enter the date (yyyy-mm-dd):"); String x = input.nextLine(); String[] s = x.split("-"); year = Integer.parseInt(s[0]); month = Integer.parseInt(s[1]); day = Integer.parseInt(s[2]); FindNextDate next = new FindNextDate(); System.out.println(next.getNextDate(year, month, day)); } } |
Output
Enter the date (yyyy-mm-dd): 2019-11-6 2019-11-7
