date_time_formatter 0.3.0

date-time-formatter-rs is a Rust crate that provides a simple and efficient way to parse and format date and time values. It is a rewrite of a subset of the Java time library, and aims to match its behaviour.
Documentation 
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// Copyright (C) 2025 Palantir
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 of the License, or (at your option)
// any later version.
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
// more details.
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc., 59
// Temple Place, Suite 330, Boston, MA 02111-1307 USA
// sbhatia@palantir.com
// "CLASSPATH" EXCEPTION TO THE GPL
// Certain source files distributed by Oracle America and/or its affiliates are
// subject to the following clarification and special exception to the GPL, but
// only where Oracle has expressly included in the particular source file's header
// the words "Oracle designates this particular file as subject to the "Classpath"
// exception as provided by Oracle in the LICENSE file that accompanied this code."
// Linking this library statically or dynamically with other modules is making
// a combined work based on this library.  Thus, the terms and conditions of
// the GNU General Public License cover the whole combination.
// As a special exception, the copyright holders of this library give you
// permission to link this library with independent modules to produce an
// executable, regardless of the license terms of these independent modules,
// and to copy and distribute the resulting executable under terms of your
// choice, provided that you also meet, for each linked independent module,
// the terms and conditions of the license of that module.  An independent
// module is a module which is not derived from or based on this library.  If
// you modify this library, you may extend this exception to your version of
// the library, but you are not obligated to do so.  If you do not wish to do
// so, delete this exception statement from your version. "

use crate::{
    date_time_parse_context::DateTimeParseContext, date_time_print_context::DateTimePrintContext,
    number_printer_parser::NumberPrinterParser,
};
use std::fmt::Debug;

pub trait AsAny {
    fn as_any_mut(&mut self) -> &mut dyn std::any::Any;
}

impl<T: 'static> AsAny for T {
    fn as_any_mut(&mut self) -> &mut dyn std::any::Any {
        self
    }
}

pub trait DateTimePrinterParser: AsAny + Debug {
    fn format(&self, context: &mut DateTimePrintContext, buf: &mut String) -> Result<bool, String>;
    fn parse(
        &self,
        context: &mut DateTimeParseContext,
        text: &str,
        position: isize,
    ) -> Result<isize, String>;

    fn as_number_printer_parser(&mut self) -> Option<&mut dyn NumberPrinterParser> {
        None
    }
}