algorithms/leetcode/1507-ReformatDate.go at master · freewu/algorithms · GitHub

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package main

// 1507. 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:
// 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.

import "fmt"
import "strings"

func reformatDate(date string) string {
    mm := map[string]string{
        "Jan": "01", "Feb": "02", "Mar": "03", "Apr": "04", "May": "05", "Jun": "06",
        "Jul": "07", "Aug": "08", "Sep": "09", "Oct": "10", "Nov": "11", "Dec": "12",
    }
    arr := strings.Split(date, " ")
    proccessDay := func(d string) string {
        arr := []rune{}
        for _, v := range d {
            if v >= '0' && v <= '9' {
                arr = append(arr, v)
            }
        }
        if len(arr) == 1 { // 1-9日的处理前面加 "0"
            return fmt.Sprintf("0%v",string(arr))
        }
        return string(arr)
    }
    return fmt.Sprintf("%v-%v-%v", arr[2], mm[arr[1]], proccessDay(arr[0]))
}

func reformatDate1(date string) string {
    mm := map[string]string{
        "Jan": "01", "Feb": "02", "Mar": "03", "Apr": "04", "May": "05", "Jun": "06",
        "Jul": "07", "Aug": "08", "Sep": "09", "Oct": "10", "Nov": "11", "Dec": "12",
    }
    arr := strings.Split(date, " ")
    day, month, year := arr[0][:len(arr[0])-2], mm[arr[1]], arr[2]
    if len(day) == 1 {
        day = "0" + day
    }
    return year + "-" + month + "-" + day
}

func main() {
    // Example 1:
    // Input: date = "20th Oct 2052"
    // Output: "2052-10-20"
    fmt.Println(reformatDate("20th Oct 2052")) // "2052-10-20"
    // Example 2:
    // Input: date = "6th Jun 1933"
    // Output: "1933-06-06"
    fmt.Println(reformatDate("6th Jun 1933")) // "1933-06-06"
    // Example 3:
    // Input: date = "26th May 1960"
    // Output: "1960-05-26"
    fmt.Println(reformatDate("26th May 1960")) // "1960-05-26"

    fmt.Println(reformatDate1("20th Oct 2052")) // "2052-10-20"
    fmt.Println(reformatDate1("6th Jun 1933")) // "1933-06-06"
    fmt.Println(reformatDate1("26th May 1960")) // "1960-05-26"
}