是否有一种文化安全的方法来获取带有前导零的ToShortDateString()和ToShortTimeString()？

Question

我知道我可以使用格式字符串,但我不想丢失日期/时间格式的特定于文化的表示.例如

5/4/2011 | 2:06 PM | ... 应该 05/04/2011 | 02:06 PM | ...

但是当我把它变成另一种文化时,我希望它成为现实

04.05.2011 | 14:06 | ...

不改变格式字符串.那可能吗？

Answer 1

您可以使用和进行翻译:DateTimeFormatInfo.CurrentInfo ShortDatePatternShortTimePattern

// Change the culture to something different
Thread.CurrentThread.CurrentCulture = new CultureInfo("de-AT");
DateTime test_datetime = new DateTime(2008, 10, 2, 3, 22, 12);
string s_date = test_datetime.ToString(DateTimeFormatInfo.CurrentInfo);

// For specifically the short date and time
string s_date1 = 
   test_datetime.ToString(DateTimeFormatInfo.CurrentInfo.ShortDatePattern);
string s_time1 = 
   test_datetime.ToString(DateTimeFormatInfo.CurrentInfo.ShortTimePattern);

// Results
// s_date1 == 02.10.2008
// s_time1 == 03:22

Answer 2

这里的答案非常复杂。事实上，这很简单

datetime.ToString("d", culture) // Short date
datetime.ToString("t", culture) // Short time

有关所有格式的完整列表以及示例输出，请参阅https://learn.microsoft.com/en-us/dotnet/api/system.datetime.tostring?view=net-5.0。

Answer 3

我只看到一个解决方案 - 你应该获得当前的文化显示格式,修补它以满足你的要求,最后使用修补格式字符串格式化你的DateTime值.以下是一些示例代码:

string pattern = CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePattern;
        DateTime dt = DateTime.Now;
        string[] format = pattern.Split(new string[] { CultureInfo.CurrentCulture.DateTimeFormat.DateSeparator }, StringSplitOptions.None);
        string newPattern = string.Empty;
        for(int i = 0; i < format.Length; i++) {
            newPattern = newPattern + format[i];
            if(format[i].Length == 1)
                newPattern += format[i];
            if(i != format.Length - 1)
                newPattern += CultureInfo.CurrentCulture.DateTimeFormat.DateSeparator;
        }

正如所承诺的,这是改进版本:

/// <summary>
/// Extensions for the <see cref="DateTime"/> class.
/// </summary>
public static class DateTimeExtensions
{
    /// <summary>
    /// Provides the same functionality as the ToShortDateString() method, but
    /// with leading zeros.
    /// <example>
    /// ToShortDateString: 5/4/2011 |
    /// ToShortDateStringZero: 05/04/2011
    /// </example>
    /// </summary>
    /// <param name="source">Source date.</param>
    /// <returns>Culture safe short date string with leading zeros.</returns>
    public static string ToShortDateStringZero(this DateTime source)
    {
        return ToShortStringZero(source,
            CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePattern,
            CultureInfo.CurrentCulture.DateTimeFormat.DateSeparator);
    }

    /// <summary>
    /// Provides the same functionality as the ToShortTimeString() method, but
    /// with leading zeros.
    /// <example>
    /// ToShortTimeString: 2:06 PM |
    /// ToShortTimeStringZero: 02:06 PM
    /// </example>
    /// </summary>
    /// <param name="source">Source date.</param>
    /// <returns>Culture safe short time string with leading zeros.</returns>
    public static string ToShortTimeStringZero(this DateTime source)
    {
        return ToShortStringZero(source,
            CultureInfo.CurrentCulture.DateTimeFormat.ShortTimePattern,
            CultureInfo.CurrentCulture.DateTimeFormat.TimeSeparator);
    }

    private static string ToShortStringZero(this DateTime source, 
        string pattern,
        string seperator)
    {
        var format = pattern.Split(new[] {seperator}, StringSplitOptions.None);

        var newPattern = string.Empty;

        for (var i = 0; i < format.Length; i++)
        {
            newPattern = newPattern + format[i];
            if (format[i].Length == 1)
                newPattern += format[i];
            if (i != format.Length - 1)
                newPattern += seperator;
        }

        return source.ToString(newPattern, CultureInfo.InvariantCulture);
    }
}