Time Formatting Parsing in D Programming Language

import std.stdio;
import std.datetime;

void main()
{
    // Here's a basic example of formatting a time
    // according to RFC3339, using the corresponding layout
    // constant.
    auto t = Clock.currTime();
    writeln(t.toISOExtString());

    // Time parsing uses the same layout values as format.
    auto t1 = SysTime.fromISOExtString("2012-11-01T22:08:41+00:00");
    writeln(t1);

    // Format and parse use example-based layouts. Usually
    // you'll use a constant from std.datetime for these layouts, but
    // you can also supply custom layouts.
    writeln(t.toSimpleString());
    writeln(t.toString());

    // For purely numeric representations you can also
    // use standard string formatting with the extracted
    // components of the time value.
    writefln("%d-%02d-%02dT%02d:%02d:%02d-00:00",
        t.year, t.month, t.day,
        t.hour, t.minute, t.second);

    // Parse will return an exception on malformed input
    // explaining the parsing problem.
    try
    {
        auto _ = SysTime.fromSimpleString("8:41PM");
    }
    catch (Exception e)
    {
        writeln(e.msg);
    }
}

This D code demonstrates time formatting and parsing, which is similar to the original Go example. Here’s a breakdown of the changes and explanations:

We import std.stdio for input/output operations and std.datetime for time-related functions.
The time.Now() function is replaced with Clock.currTime() in D.
D uses toISOExtString() to format time according to RFC3339.
For parsing, D uses SysTime.fromISOExtString() instead of time.Parse().
D doesn’t have exact equivalents for all Go’s time formatting patterns, so we use toSimpleString() and toString() to demonstrate different formatting options.
The custom formatting example is similar, using writefln() to format the time components.
For error handling in parsing, D uses exceptions instead of returning an error. We demonstrate this with a try-catch block.

To run this program, save it as time_formatting_parsing.d and use the D compiler:

$ dmd time_formatting_parsing.d
$ ./time_formatting_parsing

This will compile and run the program, displaying various formatted times and demonstrating time parsing.

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