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Increase the maximum date

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The spec goes up to a full 2168 year, but the PLC date type goes up to 2169 June 06 which is represented by 65535 (max ushort value).
This commit is contained in:
Dawid Pągowski
2023-08-23 00:53:29 +02:00
parent 8087b8d315
commit 689e7ffd96
1 changed files with 13 additions and 1 deletions
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14
S7.Net/Types/Date.cs
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@@ -15,8 +15,14 @@ namespace S7.Net.Types
/// <summary>
/// Maximum allowed date for the IEC date type
/// <remarks>
/// Although the spec allows only a max date of 31-12-2168, the PLC IEC date goes up to 06-06-2169 (which is the actual
/// WORD max value - 65535)
/// </remarks>
/// </summary>
public static readonly System.DateTime IecMaxDate = new(year: 2168, month: 12, day: 31);
public static readonly System.DateTime IecMaxDate = new(year: 2169, month: 06, day: 06);
private static readonly ushort MaxNumberOfDays = (ushort)(IecMaxDate - IecMinDate).TotalDays;
/// <summary>
/// Converts a word (2 bytes) to IEC date (<see cref="System.DateTime"/>)
@@ -29,6 +35,12 @@ namespace S7.Net.Types
}
var daysSinceDateStart = Word.FromByteArray(bytes);
if (daysSinceDateStart > MaxNumberOfDays)
{
throw new ArgumentException($"Read number exceeded the number of maximum days in the IEC date (read: {daysSinceDateStart}, max: {MaxNumberOfDays})",
nameof(bytes));
}
return IecMinDate.AddDays(daysSinceDateStart);
}