Solved! Leetcode 1507. Reformat Date

Description: Reformat Date

Given a date string in the form Day Month Year, where:

Day is in the set {"1st", "2nd", "3rd", "4th", ..., "30th", "31st"}.
Month is in the set {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}.
Year is in the range [1900, 2100].

Convert the date string to the format YYYY-MM-DD, where:

YYYY denotes the 4 digit year.
MM denotes the 2 digit month.
DD denotes the 2 digit day.

Example 1

<strong>Input:</strong> date = "20th Oct 2052"
<strong>Output:</strong> "2052-10-20"

1 2	<strong>Input:</strong> date = "20th Oct 2052" <strong>Output:</strong> "2052-10-20"

Example 2

<strong>Input:</strong> date = "6th Jun 1933"
<strong>Output:</strong> "1933-06-06"

1 2	<strong>Input:</strong> date = "6th Jun 1933" <strong>Output:</strong> "1933-06-06"

Example 3

<strong>Input:</strong> date = "26th May 1960"
<strong>Output:</strong> "1960-05-26"

1 2	<strong>Input:</strong> date = "26th May 1960" <strong>Output:</strong> "1960-05-26"

Constraints

The given dates are guaranteed to be valid, so no error handling is necessary.

Solution

class Solution {
    public String reformatDate(String date) {
        String[] month = new String[]{"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
        String[] da = date.split(" ");
        String DD = getDay(da[0]);
        String MM = getMonth(da[1], month);
        String YYYY = da[2];
        return YYYY+"-"+MM+"-"+DD;
    }

    private String getDay(String d){
        int day = 0;
        for(int i=0;i<d.length();i++){
            char c = d.charAt(i);
            if(Character.isDigit(c)){
                day = day*10+(c-'0');
            } else {
                break;
            }
        }
        return day < 10?"0"+day:day+"";
    }

    private String getMonth(String m, String[] month){
        int mm = 0;
        for(int i=0;i<month.length;i++){
            if(m.equals(month[i])){
                mm=i+1;
                break;
            }
        }

        return mm<10?"0"+mm:mm+"";
    }
}

class Solution {

public String reformatDate(String date) {

String[] month = new String[]{"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};

String[] da = date.split(" ");

String DD = getDay(da[0]);

String MM = getMonth(da[1], month);

String YYYY = da[2];

return YYYY+"-"+MM+"-"+DD;

}

private String getDay(String d){

int day = 0;

for(int i=0;i<d.length();i++){

char c = d.charAt(i);

if(Character.isDigit(c)){

day = day*10+(c-'0');

} else {

break;

}

return day < 10?"0"+day:day+"";

}

private String getMonth(String m, String[] month){

int mm = 0;

for(int i=0;i<month.length;i++){

if(m.equals(month[i])){

mm=i+1;

break;

}

return mm<10?"0"+mm:mm+"";

}

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