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    $dt->datetime;
    $dt->ymd;                            # "2026-04-10"
    $dt->ymd('/');                       # "2026/04/10"
    $dt->hms;                            # "06:10:30"
    $dt->dmy('.');                       # "10.04.2026"
    $dt->mdy('-');                       # "10-04-2026"
    $dt->rfc3339;                        # "2026-04-10T06:10:30+09:00"
    $dt->strftime('%Y-%m-%d %H:%M:%S');  # "2026-04-10 06:10:30"
    $dt->format_cldr('yyyy/MM/dd');      # "2026/04/10" (Unicode CLDR pattern)
    "$dt";                               # stringify via iso8601 (or formatter)

    # Arithmetic
    $dt->add( years => 1, months  => 2, days    => 3,
              hours => 4, minutes => 5, seconds => 6 );
    $dt->subtract( weeks => 2 );

    my $dur = DateTime::Lite::Duration->new( months => 6 );
    $dt->add_duration( $dur );
    $dt->subtract_duration( $dur );

    my $diff     = $dt->subtract_datetime( $other );           # Duration
    my $abs_diff = $dt->subtract_datetime_absolute( $other );  # clock-only Duration
    my $dd       = $dt->delta_days( $other );
    my $dmd      = $dt->delta_md( $other );
    my $dms      = $dt->delta_ms( $other );

    # Mutators
    $dt->set( year => 2027, month => 1, day => 1 );
    $dt->set_year(2027);
    $dt->set_month(1);
    $dt->set_day(1);
    $dt->set_hour(0);
    $dt->set_minute(0);
    $dt->set_second(0);
    $dt->set_nanosecond(0);
    $dt->set_time_zone('America/New_York');
    $dt->set_locale('en-US');  # sets a new DateTime::Locale::FromCLDR object
    $dt->set_formatter( $formatter );
    $dt->truncate( to => 'day' );   # 'year','month','week','day','hour','minute','second'

    # Works for second, minute, hour, day, week, local_week, month, quarter,
    # year, decade, century
    $dt->end_of( 'month' );
    say $dt;  # 2026-04-30T23:59:59.999999999
    $dt->start_of( 'month' );
    say $dt;  # 2026-04-01T00:00:00

    # Comparison
    my @sorted = sort { $a <=> $b } @datetimes;  # overloaded <=>
    DateTime::Lite->compare( $dt1, $dt2 );       # -1, 0, 1
    DateTime::Lite->compare_ignore_floating( $dt1, $dt2 );
    $dt->is_between( $lower, $upper );

    # Class-level settings
    DateTime::Lite->DefaultLocale('fr-FR');
    my $class = $dt->duration_class;  # 'DateTime::Lite::Duration'

    # Constants
    DateTime::Lite::INFINITY();        # +Inf
    DateTime::Lite::NEG_INFINITY();    # -Inf
    DateTime::Lite::NAN();             # NaN
    DateTime::Lite::MAX_NANOSECONDS(); # 1_000_000_000
    DateTime::Lite::SECONDS_PER_DAY(); # 86400

    # Error handling
    my $dt2 = DateTime::Lite->new( %bad_args ) ||
        die( DateTime::Lite->error );
    # Chaining: bad calls return a NullObject so the chain continues safely;
    # check the return value of the last call in the chain.
    my $result = $dt->some_method->another_method ||
        die( $dt->error );

# VERSION

    v0.6.1

# DESCRIPTION

`DateTime::Lite` is a lightweight, memory-efficient, drop-in replacement for [DateTime](https://metacpan.org/pod/DateTime) with the following design goals:

- Low dependency footprint

    Runtime dependencies are limited to: [DateTime::Lite::TimeZone](https://metacpan.org/pod/DateTime%3A%3ALite%3A%3ATimeZone) (bundled SQLite timezone data, with automatic fallback to [DateTime::TimeZone](https://metacpan.org/pod/DateTime%3A%3ATimeZ...

    The heavy [Specio](https://metacpan.org/pod/Specio), [Params::ValidationCompiler](https://metacpan.org/pod/Params%3A%3AValidationCompiler), [Try::Tiny](https://metacpan.org/pod/Try%3A%3ATiny), and `namespace::autoclean` are eliminated entirely.

- Low memory footprint

    `DateTime` loads a cascade of modules which inflates `%INC` significantly. `DateTime::Lite` avoids this via selective lazy loading.

- Accurate timezone data from TZif binaries

    `DateTime::TimeZone` derives its zone data from the IANA Olson _source_ files (`africa`, `northamerica`, etc.) via a custom text parser (`DateTime::TimeZone::OlsonDB`), then pre-generates one `.pm` file per zone at distribution build time. This i...

    `DateTime::Lite::TimeZone` instead compiles the IANA source files with `zic(1)`, which is the official IANA compiler, and reads the resulting TZif binary files directly, following [RFC 9636](https://www.rfc-editor.org/rfc/rfc9636) (TZif versions ...

    Crucially, the POSIX footer TZ string embedded in every TZif v2+ file, such as `EST5EDT,M3.2.0,M11.1.0`, is extracted and stored in the SQLite database.

    This string encodes the recurring DST rule for all dates beyond the last explicit transition. At runtime, `DateTime::Lite::TimeZone` evaluates the footer rule via an XS implementation of the IANA `tzcode` reference algorithm (see `dtl_posix.h`, d...

- XS-accelerated hot paths

    The XS layer covers all CPU-intensive calendar arithmetic (`_rd2ymd`, `_ymd2rd`, `_seconds_as_components`, all leap-second helpers), plus new functions not in the original: `_rd_to_epoch`, `_epoch_to_rd`, `_normalize_nanoseconds`, and `_compare_r...

- Compatible API

    The public API mirrors [DateTime](https://metacpan.org/pod/DateTime) as closely as possible, so existing code using `DateTime` should work with `DateTime::Lite` as a drop-in replacement.

- Full Unicode CLDR / BCP 47 locale support

    `DateTime` is limited to the set of pre-generated `DateTime::Locale::*` modules, one per locale. `DateTime::Lite` accepts any valid Unicode CLDR / BCP 47 locale tag, including complex forms with Unicode extensions (`-u-`), transform extensions (`...

        my $dt = DateTime::Lite->now( locale => 'en' );    # simple form
        my $dt = DateTime::Lite->now( locale => 'en-GB' ); # simple form
        # And more complex forms too
        my $dt = DateTime::Lite->now( locale => 'he-IL-u-ca-hebrew-tz-jeruslm' );
        my $dt = DateTime::Lite->now( locale => 'ja-Kana-t-it' );
        my $dt = DateTime::Lite->now( locale => 'ar-SA-u-nu-latn' );

    Locale data is resolved dynamically by [DateTime::Locale::FromCLDR](https://metacpan.org/pod/DateTime%3A%3ALocale%3A%3AFromCLDR) via [Locale::Unicode::Data](https://metacpan.org/pod/Locale%3A%3AUnicode%3A%3AData), so tags like `he-IL-u-ca-hebrew-...