Time Formatting Parsing in Modelica

Modelica supports time operations through its built-in DateTime type and the Modelica.Utilities.Types.DateTime library. Here’s how we can perform time formatting and parsing in Modelica:

model TimeFormattingParsing
  import Modelica.Utilities.Types.DateTime;
  import Modelica.Utilities.Strings;

  function printDateTime
    input DateTime dt;
  algorithm
    Modelica.Utilities.Streams.print(DateTime.toString(dt));
  end printDateTime;

equation
  when initial() then
    // Get current time
    DateTime now = DateTime.now();
    printDateTime(now);

    // Parse a string to DateTime
    DateTime parsedTime = DateTime.fromString("2012-11-01T22:08:41");
    printDateTime(parsedTime);

    // Custom formatting
    Modelica.Utilities.Streams.print(DateTime.toString(now, format="%H:%M"));
    Modelica.Utilities.Streams.print(DateTime.toString(now, format="%a %b %d %H:%M:%S %Y"));
    Modelica.Utilities.Streams.print(DateTime.toString(now, format="%Y-%m-%dT%H:%M:%S.%f"));

    // Parse with custom format
    DateTime customParsed = DateTime.fromString("8:41 PM", format="%I:%M %p");
    printDateTime(customParsed);

    // Numeric representation
    Modelica.Utilities.Streams.print(String.format("%d-%02d-%02dT%02d:%02d:%02d",
      DateTime.year(now), DateTime.month(now), DateTime.day(now),
      DateTime.hour(now), DateTime.minute(now), DateTime.second(now)));

    // Error handling for parsing
    try
      DateTime invalidParsed = DateTime.fromString("8:41PM", format="%a %b %d %H:%M:%S %Y");
    catch
      Modelica.Utilities.Streams.print("Error parsing time");
    end try;
  end when;
end TimeFormattingParsing;

In this Modelica example:

We use the DateTime type from the Modelica Standard Library to work with dates and times.
The DateTime.toString() function is used for formatting dates, similar to Go’s Format method.
DateTime.fromString() is used for parsing strings into DateTime objects, analogous to Go’s Parse function.
Custom format strings can be used with both toString() and fromString(). The format specifiers are different from Go’s, following more closely the POSIX standard.
For purely numeric representations, we use String.format() along with individual components extracted from the DateTime object.
Error handling is done using a try-catch block, as Modelica doesn’t have a direct equivalent to Go’s multiple return values for error handling.

Note that Modelica’s datetime handling is not as flexible as Go’s, and some advanced features may not be directly available. The exact output will depend on the Modelica simulation environment and the current time when the model is executed.

This example demonstrates the basic concepts of time formatting and parsing in Modelica, adapting the ideas from the original example to fit Modelica’s paradigm and available libraries.

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Time Formatting Parsing in Modelica