C# Signature:

[DllImport("kernel32.dll")]
static extern int GetTimeFormat(uint locale, uint dwFlags, ref SystemTime time, string format, StringBuilder sb, int sbSize);
static extern int GetTimeFormat(uint Locale, uint dwFlags, ref SYSTEMTIME lpTime,
   string lpFormat, [Out] StringBuilder lpTimeStr, int cchTime);

User-Defined Types:

SYSTEMTIME in Win32 is different then DateTime in CLR. This structure may represent SYSTEMTIME in CLR world:

    [StructLayout(LayoutKind.Sequential)]
    private struct SystemTime {
        [MarshalAs(UnmanagedType.U2)] public ushort Year;
        [MarshalAs(UnmanagedType.U2)] public ushort Month;
        [MarshalAs(UnmanagedType.U2)] public ushort DayOfWeek;
        [MarshalAs(UnmanagedType.U2)] public ushort Day;
        [MarshalAs(UnmanagedType.U2)] public ushort Hour;
        [MarshalAs(UnmanagedType.U2)] public ushort Minute;
        [MarshalAs(UnmanagedType.U2)] public ushort Second;
        [MarshalAs(UnmanagedType.U2)] public ushort Milliseconds;
    }

None.

Notes:

Win32 interprets format differently than CLR does so if you don't need exactly Win32 compatible behavior use DateTime.ToString() instead.

None.

Tips & Tricks:

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Sample Code:

(see sample code for GetDateFormat())

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Alternative Managed API:

    DateTime.ToString(string format, IFormatProvider provider);

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