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Formatted question description: https://leetcode.ca/all/1507.html
1507. Reformat Date (Easy)
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:
Input: date = "20th Oct 2052" Output: "2052-10-20"
Example 2:
Input: date = "6th Jun 1933" Output: "1933-06-06"
Example 3:
Input: date = "26th May 1960" Output: "1960-05-26"
Constraints:
- The given dates are guaranteed to be valid, so no error handling is necessary.
Related Topics:
String
Solution 1.
-
class Solution { public String reformatDate(String date) { String[] months = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}; Map<String, Integer> map = new HashMap<String, Integer>(); for (int i = 1; i <= 12; i++) map.put(months[i - 1], i); String[] array = date.split(" "); int year = Integer.parseInt(array[2]); int month = map.get(array[1]); int day = Integer.parseInt(array[0].substring(0, array[0].length() - 2)); return String.format("%d-%02d-%02d", year, month, day); } } ############ class Solution { public String reformatDate(String date) { var s = date.split(" "); String months = " JanFebMarAprMayJunJulAugSepOctNovDec"; int day = Integer.parseInt(s[0].substring(0, s[0].length() - 2)); int month = months.indexOf(s[1]) / 3 + 1; return String.format("%s-%02d-%02d", s[2], month, day); } }
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// OJ: https://leetcode.com/problems/reformat-date/ // Time: O(1) // Space: O(1) class Solution { public: string reformatDate(string date) { istringstream ss(date); string day, mon, year, m; ss >> day >> mon >> year; if (mon == "Jan") m = "01"; else if (mon == "Feb") m = "02"; else if (mon == "Mar") m = "03"; else if (mon == "Apr") m = "04"; else if (mon == "May") m = "05"; else if (mon == "Jun") m = "06"; else if (mon == "Jul") m = "07"; else if (mon == "Aug") m = "08"; else if (mon == "Sep") m = "09"; else if (mon == "Oct") m = "10"; else if (mon == "Nov") m = "11"; else m = "12"; string d = to_string(stoi(day)); return year + "-" + m + "-" + (d.size() == 1? "0" + d : d); } };
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class Solution: def reformatDate(self, date: str) -> str: s = date.split() s.reverse() months = " JanFebMarAprMayJunJulAugSepOctNovDec" s[1] = str(months.index(s[1]) // 3 + 1).zfill(2) s[2] = s[2][:-2].zfill(2) return "-".join(s)
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func reformatDate(date string) string { s := strings.Split(date, " ") day, _ := strconv.Atoi(s[0][:len(s[0])-2]) months := " JanFebMarAprMayJunJulAugSepOctNovDec" month := strings.Index(months, s[1])/3 + 1 year, _ := strconv.Atoi(s[2]) return fmt.Sprintf("%d-%02d-%02d", year, month, day) }
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class Solution { /** * @param String $date * @return String */ function reformatDate($date) { $arr = explode(" ", $date); $months = array("Jan" => "01", "Feb" => "02", "Mar" => "03", "Apr" => "04", "May" => "05", "Jun" => "06", "Jul" => "07", "Aug" => "08", "Sep" => "09", "Oct" => "10", "Nov" => "11", "Dec" => "12"); $year = $arr[2]; $month = $months[$arr[1]]; $day = intval($arr[0]); if ($day > 0 && $day < 10) $day = "0".$day; return $year."-".$month."-".$day; } }
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function reformatDate(date: string): string { const s = date.split(' '); const months = ' JanFebMarAprMayJunJulAugSepOctNovDec'; const day = parseInt(s[0].substring(0, s[0].length - 2)); const month = Math.floor(months.indexOf(s[1]) / 3) + 1; return `${s[2]}-${month.toString().padStart(2, '0')}-${day .toString() .padStart(2, '0')}`; }