PHP日期格式符号与JAVA日期格式符号

Question

PHP似乎使用Java以外的其他日期格式符号来格式化基于模式的日期。例如，当我想输出这样的日期时：

17.03.2014 09:50

在PHP中，我必须使用日期格式模式

d.m.Y H:i

在Java中，我使用这种模式

dd.mm.yyyy hh:mm

是否有一个Java类，可以将给定的输入(Java)模式转换为PHP模式，例如将dd.mm.yyyy hh:mm转换为d.m.Y H:i？我要问，因为我必须使用Javascript 日期选择器，它使用PHP格式符号来格式化日期。

Answer 1

对不起，没有Java类执行此转换。你必须根据你的需要从头开始写你自己的书。

注意:每种编程语言都使用自己的模式方言。甚至Java也有自第8版以来的两种不同的模式样式，但它们之间没有转换！

补充编辑：

您还应该记住，由于底层不同格式和解析引擎的限制，转换并不总是可能的。此外，有时新的模式方言的中断和引入是有道理的，请参阅JSR-310的设计决定，以获得更类似于CLDR的、功能更强大的Java模式方言。

Answer 2

这是我写的，它依赖于JodaTime库。我还没有对每一个案例做过深入的测试，所以要确保它对你有用。

import org.joda.time.DateTime;

import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;

public class DateUtils {
    private static final String[] daysOfWeek = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
    private static final String[] daysOfWeekShort = {"Sun", "Mon", "Tues", "Wed", "Thur", "Fri", "Sat"};
    private static final String[] months = {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};
    private static final String[] monthsShort = {"Jan", "Feb", "March", "April", "May", "June", "July", "Aug", "Sep", "Oct", "Nov", "Dec"};
    private static final String[] daysInMonth = {"31", "28", "31", "30", "31", "30", "31", "31", "30", "31", "30", "31"};
    private static final String[] suffixes = {"st", "nd", "rd", "th", "th", "th", "th", "th", "th", "th",
                                              "th", "th", "th", "th", "th", "th", "th", "th", "th", "th",
                                              "st", "nd", "rd", "th", "th", "th", "th", "th", "th", "th",
                                              "th", "th"};

    /*
        Works like PHP Date function, has support for most characters.  Time zone offsets mainly what is missing.
     */
    public static String format(DateTime dt, String format){
        int pos = 0;
        char[] charArray = format.toCharArray();
        int length = charArray.length;
        StringBuilder sb = new StringBuilder();
        while (pos < length){
            switch(charArray[pos]){
            // Days
                case 'd':
                    sb.append(dt.getDayOfMonth() < 10 ? "0" + dt.getDayOfMonth() : dt.getDayOfMonth());
                    break;
                case 'D':
                    sb.append(daysOfWeekShort[dt.getDayOfWeek()]);
                    break;
                case 'l':
                    sb.append(daysOfWeek[dt.getDayOfWeek()]);
                    break;
                case 'j':
                    sb.append(dt.getDayOfMonth());
                    break;
                case 'N':
                    sb.append(dt.getDayOfWeek() + 1);
                    break;
                case 'S':
                    sb.append(suffixes[dt.getDayOfMonth() - 1]);
                case 'w':
                    sb.append(dt.getDayOfWeek());
                    break;
                case 'z':
                    sb.append(dt.getDayOfYear());
                    break;

            // Weeks
                case 'W':
                    sb.append(dt.getWeekOfWeekyear()); // Needs confirmation
                    break;
            // Months
                case 'F':
                    sb.append(months[dt.getMonthOfYear() - 1]);
                    break;
                case 'M':
                    sb.append(monthsShort[dt.getMonthOfYear() - 1]);
                    break;
                case 'm':
                    sb.append(dt.getMonthOfYear() < 10 ? "0" + dt.getMonthOfYear() : dt.getMonthOfYear());
                    break;
                case 'n':
                    sb.append(dt.getMonthOfYear());
                    break;
                case 't':
                    int moy = dt.getMonthOfYear();
                    if (moy == 2 && dt.getYear() % 4 == 0) { sb.append("29"); }
                    else { sb.append(daysInMonth[moy]); }
                    break;
            // Years
                case 'Y':
                    sb.append(dt.getYear());
                    break;
                case 'y':
                    sb.append(dt.getYearOfCentury());
                    break;
                case 'L':
                    sb.append(dt.getYearOfCentury() % 4 == 0 ? 1 : 0);
                    break;
            // AM/PM
                case 'a':
                    sb.append(dt.getHourOfDay() < 13 ? "am" : "pm");
                    break;
                case 'A':
                    sb.append(dt.getHourOfDay() < 13 ? "AM" : "PM");
                    break;
            // Hours
                case 'g':
                    sb.append(dt.getHourOfDay() % 12);
                    break;
                case 'G':
                    sb.append(dt.getHourOfDay());
                    break;
                case 'h':
                    sb.append(dt.getHourOfDay() < 10 ? "0" + dt.getHourOfDay() % 12 : dt.getHourOfDay() % 12);
                    break;
                case 'H':
                    sb.append(dt.getHourOfDay() < 10 ? "0" + dt.getHourOfDay() : dt.getHourOfDay());
                    break;
            // Minute
                case 'i':
                    sb.append(dt.getMinuteOfHour() < 10 ? "0" + dt.getMinuteOfHour() : dt.getMinuteOfHour());
                    break;
            // Second
                case 's':
                    sb.append(dt.getSecondOfMinute());
                    break;
            // Timezone
                case 'e':
                    sb.append(dt.getZone());
                    break;
            // Any other character
                default:
                    sb.append(charArray[pos]);
            }
            pos++;
        }
        return sb.toString();
    }
}