diff --git a/composer.json b/composer.json
index 44d1bb1cf..a735d680a 100644
--- a/composer.json
+++ b/composer.json
@@ -30,6 +30,7 @@
 		"ext-iconv": "to use filters |reverse, |substring",
 		"ext-mbstring": "to use filters like lower, upper, capitalize, ...",
 		"ext-fileinfo": "to use filter |datastream",
+		"ext-intl": "to use Latte\\Engine::setLocale()",
 		"nette/utils": "to use filter |webalize",
 		"nette/php-generator": "to use tag {templatePrint}"
 	},
diff --git a/src/Latte/Engine.php b/src/Latte/Engine.php
index 6f0b3d737..00f33d4f1 100644
--- a/src/Latte/Engine.php
+++ b/src/Latte/Engine.php
@@ -50,6 +50,7 @@ class Engine
 	private bool $sandboxed = false;
 	private ?string $phpBinary = null;
 	private ?string $cacheKey;
+	private ?string $locale = null;
 
 
 	public function __construct()
@@ -565,6 +566,25 @@ public function isStrictParsing(): bool
 	}
 
 
+	/**
+	 * Sets locale for date and number formatting. See PHP intl extension.
+	 */
+	public function setLocale(?string $locale): static
+	{
+		if ($locale && !extension_loaded('intl')) {
+			throw new RuntimeException("Locate requires the 'intl' extension to be installed.");
+		}
+		$this->locale = $locale;
+		return $this;
+	}
+
+
+	public function getLocale(): ?string
+	{
+		return $this->locale;
+	}
+
+
 	public function setLoader(Loader $loader): static
 	{
 		$this->loader = $loader;
diff --git a/src/Latte/Essential/CoreExtension.php b/src/Latte/Essential/CoreExtension.php
index e081d5d2d..04a56c589 100644
--- a/src/Latte/Essential/CoreExtension.php
+++ b/src/Latte/Essential/CoreExtension.php
@@ -40,6 +40,12 @@ public function beforeCompile(Latte\Engine $engine): void
 	}
 
 
+	public function beforeRender(Runtime\Template $template): void
+	{
+		$this->filters->locale = $template->getEngine()->getLocale();
+	}
+
+
 	public function getTags(): array
 	{
 		return [
@@ -142,7 +148,7 @@ public function getFilters(): array
 			'lower' => extension_loaded('mbstring')
 				? [$this->filters, 'lower']
 				: fn() => throw new RuntimeException('Filter |lower requires mbstring extension.'),
-			'number' => 'number_format',
+			'number' => [$this->filters, 'number'],
 			'padLeft' => [$this->filters, 'padLeft'],
 			'padRight' => [$this->filters, 'padRight'],
 			'query' => [$this->filters, 'query'],
diff --git a/src/Latte/Essential/Filters.php b/src/Latte/Essential/Filters.php
index 66d4cc5dc..b51f3bae3 100644
--- a/src/Latte/Essential/Filters.php
+++ b/src/Latte/Essential/Filters.php
@@ -23,6 +23,9 @@
  */
 final class Filters
 {
+	public ?string $locale = null;
+
+
 	/**
 	 * Converts HTML to plain text.
 	 */
@@ -166,16 +169,13 @@ public static function repeat(FilterInfo $info, $s, int $count): string
 	/**
 	 * Date/time formatting.
 	 */
-	public static function date(string|int|\DateTimeInterface|\DateInterval|null $time, ?string $format = null): ?string
+	public function date(string|int|\DateTimeInterface|\DateInterval|null $time, ?string $format = null): ?string
 	{
+		$format ??= Latte\Runtime\Filters::$dateFormat;
 		if ($time == null) { // intentionally ==
 			return null;
-		}
-
-		$format ??= Latte\Runtime\Filters::$dateFormat;
-		if ($time instanceof \DateInterval) {
+		} elseif ($time instanceof \DateInterval) {
 			return $time->format($format);
-
 		} elseif (is_numeric($time)) {
 			$time = (new \DateTime)->setTimestamp((int) $time);
 		} elseif (!$time instanceof \DateTimeInterface) {
@@ -186,8 +186,23 @@ public static function date(string|int|\DateTimeInterface|\DateInterval|null $ti
 			if (PHP_VERSION_ID >= 80100) {
 				trigger_error("Function strftime() used by filter |date is deprecated since PHP 8.1, use format without % characters like 'Y-m-d'.", E_USER_DEPRECATED);
 			}
-
 			return @strftime($format, $time->format('U') + 0);
+
+		} elseif (preg_match('#^(\+(short|medium|long|full))?(\+time(\+sec)?)?$#', '+' . $format, $m)) {
+			$formatter = new \IntlDateFormatter(
+				$this->getLocale('date'),
+				match ($m[2]) {
+					'short' => \IntlDateFormatter::SHORT,
+					'medium' => \IntlDateFormatter::MEDIUM,
+					'long' => \IntlDateFormatter::LONG,
+					'full' => \IntlDateFormatter::FULL,
+					'' => \IntlDateFormatter::NONE,
+				},
+				isset($m[3]) ? (isset($m[4]) ? \IntlDateFormatter::MEDIUM : \IntlDateFormatter::SHORT) : \IntlDateFormatter::NONE,
+			);
+			$res = $formatter->format($time);
+			$res = preg_replace('~(\d\.) ~', "\$1\u{a0}", $res);
+			return $res;
 		}
 
 		return $time->format($format);
@@ -197,7 +212,7 @@ public static function date(string|int|\DateTimeInterface|\DateInterval|null $ti
 	/**
 	 * Converts to human-readable file size.
 	 */
-	public static function bytes(float $bytes, int $precision = 2): string
+	public function bytes(float $bytes, int $precision = 2): string
 	{
 		$bytes = round($bytes);
 		$units = ['B', 'kB', 'MB', 'GB', 'TB', 'PB'];
@@ -209,7 +224,15 @@ public static function bytes(float $bytes, int $precision = 2): string
 			$bytes /= 1024;
 		}
 
-		return round($bytes, $precision) . ' ' . $unit;
+		if ($this->locale === null) {
+			$bytes = (string) round($bytes, $precision);
+		} else {
+			$formatter = new \NumberFormatter($this->locale, \NumberFormatter::DECIMAL);
+			$formatter->setAttribute(\NumberFormatter::MAX_FRACTION_DIGITS, $precision);
+			$bytes = $formatter->format($bytes);
+		}
+
+		return $bytes . ' ' . $unit;
 	}
 
 
@@ -455,7 +478,7 @@ public static function batch(iterable $list, int $length, $rest = null): \Genera
 	 * @param  iterable<K, V>  $data
 	 * @return iterable<K, V>
 	 */
-	public static function sort(
+	public function sort(
 		iterable $data,
 		?\Closure $comparison = null,
 		string|int|\Closure|null $by = null,
@@ -469,7 +492,16 @@ public static function sort(
 			$by = $byKey === true ? null : $byKey;
 		}
 
-		$comparison ??= fn($a, $b) => $a <=> $b;
+		if ($comparison) {
+		} elseif ($this->locale === null) {
+			$comparison = fn($a, $b) => $a <=> $b;
+		} else {
+			$collator = new \Collator($this->locale);
+			$comparison = fn($a, $b) => is_string($a) && is_string($b)
+				? $collator->compare($a, $b)
+				: $a <=> $b;
+		}
+
 		$comparison = match (true) {
 			$by === null => $comparison,
 			$by instanceof \Closure => fn($a, $b) => $comparison($by($a), $by($b)),
@@ -650,4 +682,33 @@ public static function random(string|array $values): mixed
 			? $values[array_rand($values, 1)]
 			: null;
 	}
+
+
+	/**
+	 * Formats a number with grouped thousands and optionally decimal digits according to locale.
+	 */
+	public function number(
+		float $number,
+		int $decimals = 0,
+		string $decimalSeparator = '.',
+		string $thousandsSeparator = ',',
+	): string
+	{
+		if ($this->locale === null || func_num_args() > 2) {
+			return number_format($number, $decimals, $decimalSeparator, $thousandsSeparator);
+		}
+
+		$formatter = new \NumberFormatter($this->locale, \NumberFormatter::DECIMAL);
+		$formatter->setAttribute(\NumberFormatter::FRACTION_DIGITS, $decimals);
+		return $formatter->format($number);
+	}
+
+
+	private function getLocale(string $name): string
+	{
+		if ($this->locale === null) {
+			throw new Latte\RuntimeException("Filter |$name requires the locale to be set using Engine::setLocale()");
+		}
+		return $this->locale;
+	}
 }
diff --git a/tests/filters/bytes.phpt b/tests/filters/bytes.phpt
index fb40acc0c..df059c3c2 100644
--- a/tests/filters/bytes.phpt
+++ b/tests/filters/bytes.phpt
@@ -12,10 +12,20 @@ use Tester\Assert;
 require __DIR__ . '/../bootstrap.php';
 
 
-Assert::same('0 B', Filters::bytes(0.1));
+test('no locale', function () {
+	$filters = new Filters;
 
+	Assert::same('0 B', $filters->bytes(0.1));
+	Assert::same('-1.03 GB', $filters->bytes(-1024 * 1024 * 1050));
+	Assert::same('8881.78 PB', $filters->bytes(1e19));
+});
 
-Assert::same('-1.03 GB', Filters::bytes(-1024 * 1024 * 1050));
 
+test('with locale', function () {
+	$filters = new Filters;
+	$filters->locale = 'cs_CZ';
 
-Assert::same('8881.78 PB', Filters::bytes(1e19));
+	Assert::same('0 B', $filters->bytes(0.1));
+	Assert::same('-1,03 GB', $filters->bytes(-1024 * 1024 * 1050));
+	Assert::same('8 881,78 PB', $filters->bytes(1e19));
+});
diff --git a/tests/filters/date.phpt b/tests/filters/date.phpt
index b72abf48d..9000a029d 100644
--- a/tests/filters/date.phpt
+++ b/tests/filters/date.phpt
@@ -12,32 +12,47 @@ use Tester\Assert;
 require __DIR__ . '/../bootstrap.php';
 
 
-setlocale(LC_TIME, 'C');
-
-
-Assert::null(Filters::date(null));
-
-
-Assert::same("23.\u{a0}1.\u{a0}1978", Filters::date(254_400_000));
-
-
-Assert::same("5.\u{a0}5.\u{a0}1978", Filters::date('1978-05-05'));
-
-
-Assert::same("5.\u{a0}5.\u{a0}1978", Filters::date(new DateTime('1978-05-05')));
-
-
-Assert::same('1978-01-23', Filters::date(254_400_000, 'Y-m-d'));
-
-
-Assert::same('1212-09-26', Filters::date('1212-09-26', 'Y-m-d'));
-
-
-Assert::same('1212-09-26', Filters::date(new DateTimeImmutable('1212-09-26'), 'Y-m-d'));
-
-
-Assert::same('30:10:10', Filters::date(new DateInterval('PT30H10M10S'), '%H:%I:%S'));
-
-
-date_default_timezone_set('America/Los_Angeles');
-Assert::same('07:09', Filters::date(1_408_284_571, 'H:i'));
+test('no locale', function () {
+	$filters = new Filters;
+
+	Assert::null($filters->date(null));
+	Assert::same("5.\u{a0}5.\u{a0}1978", $filters->date('1978-05-05'));
+	Assert::same("5.\u{a0}5.\u{a0}1978", $filters->date(new DateTime('1978-05-05')));
+	Assert::same('1978-01-23', $filters->date(254_400_000, 'Y-m-d'));
+	Assert::same('1212-09-26', $filters->date('1212-09-26', 'Y-m-d'));
+	Assert::same('1212-09-26', $filters->date(new DateTimeImmutable('1212-09-26'), 'Y-m-d'));
+
+	// timestamp
+	date_default_timezone_set('America/Los_Angeles');
+	Assert::same("23.\u{a0}1.\u{a0}1978", $filters->date(254_400_000));
+	Assert::same('07:09', $filters->date(1_408_284_571, 'H:i'));
+});
+
+
+test('date interval', function () {
+	$filters = new Filters;
+
+	Assert::same('30:10:10', $filters->date(new DateInterval('PT30H10M10S'), '%H:%I:%S'));
+});
+
+
+test('local date/time', function () {
+	$filters = new Filters;
+	$filters->locale = 'cs_CZ';
+
+	// date format
+	Assert::null($filters->date(null, 'medium'));
+	Assert::same("5.\u{a0}5.\u{a0}1978", $filters->date('1978-05-05', 'medium'));
+	Assert::same('05.05.78', $filters->date(new DateTime('1978-05-05'), 'short'));
+	Assert::same("5.\u{a0}5.\u{a0}1978", $filters->date(new DateTime('1978-05-05'), 'medium'));
+	Assert::same("5.\u{a0}května 1978", $filters->date(new DateTime('1978-05-05'), 'long'));
+	Assert::same("pátek 5.\u{a0}května 1978", $filters->date(new DateTime('1978-05-05'), 'full'));
+
+	// time format
+	Assert::same('12:13', $filters->date(new DateTime('12:13:14'), 'time'));
+	Assert::same('12:13:14', $filters->date(new DateTime('12:13:14'), 'time+sec'));
+
+	// combined
+	Assert::same('05.05.78 12:13', $filters->date(new DateTime('1978-05-05 12:13:14'), 'short+time'));
+	Assert::same('05.05.78 12:13:14', $filters->date(new DateTime('1978-05-05 12:13:14'), 'short+time+sec'));
+});
diff --git a/tests/filters/number.phpt b/tests/filters/number.phpt
new file mode 100644
index 000000000..4c231662a
--- /dev/null
+++ b/tests/filters/number.phpt
@@ -0,0 +1,59 @@
+<?php
+
+/**
+ * Test: Latte\Essential\Filters::number()
+ */
+
+declare(strict_types=1);
+
+use Latte\Essential\Filters;
+use Tester\Assert;
+
+require __DIR__ . '/../bootstrap.php';
+
+
+test('no locale', function () {
+	$filters = new Filters;
+
+	Assert::same('0', $filters->number(0));
+	Assert::same('0.00', $filters->number(0, 2));
+	Assert::same('1,234', $filters->number(1234));
+	Assert::same('123.46', $filters->number(123.456, 2));
+	Assert::same('123.457', $filters->number(123.4567, 3));
+	Assert::same('1 234.56', $filters->number(1234.56, 2, '.', ' '));
+	Assert::same('1.234,56', $filters->number(1234.56, 2, ',', '.'));
+	Assert::same('-1,234', $filters->number(-1234));
+	Assert::same('-1,234.57', $filters->number(-1234.5678, 2));
+	Assert::same('nan', $filters->number(NAN, 2));
+
+	// negative decimals means rounding
+	Assert::same('100', $filters->number(123.456, -2));
+});
+
+
+test('with locale', function () {
+	$filters = new Filters;
+	$filters->locale = 'cs_CZ';
+
+	Assert::same('0', $filters->number(0));
+	Assert::same('0,00', $filters->number(0, 2));
+	Assert::same('1 234', $filters->number(1234));
+	Assert::same('123,46', $filters->number(123.456, 2));
+	Assert::same('123,457', $filters->number(123.4567, 3));
+	Assert::same('-1 234', $filters->number(-1234));
+	Assert::same('-1 234,57', $filters->number(-1234.5678, 2));
+	Assert::same('NaN', $filters->number(NAN, 2));
+
+	// negative decimals is invalid, prints all digits
+	Assert::same('0', $filters->number(0.0, -2));
+	Assert::same('123,456', $filters->number(123.456, -2));
+});
+
+
+test('disabled locale', function () {
+	$filters = new Filters;
+	$filters->locale = 'cs_CZ';
+
+	Assert::same('1 234.56', $filters->number(1234.56, 2, '.', ' '));
+	Assert::same('1.234,56', $filters->number(1234.56, 2, ',', '.'));
+});
diff --git a/tests/filters/sort.phpt b/tests/filters/sort.phpt
index 7d957aa1a..c60ee9260 100644
--- a/tests/filters/sort.phpt
+++ b/tests/filters/sort.phpt
@@ -31,13 +31,14 @@ function exportIterator(Traversable $iterator): array
 
 
 test('array', function () {
-	Assert::same([1 => 11, 0 => 22, 33], Filters::sort([22, 11, 33]));
-	Assert::same([], Filters::sort([]));
+	$filters = new Filters;
+	Assert::same([1 => 11, 0 => 22, 33], $filters->sort([22, 11, 33]));
+	Assert::same([], $filters->sort([]));
 });
 
 
 test('iterator', function () {
-	$sorted = Filters::sort(iterator());
+	$sorted = (new Filters)->sort(iterator());
 
 	Assert::same(3, count($sorted));
 	Assert::equal(
@@ -52,7 +53,7 @@ test('iterator', function () {
 
 
 test('re-iteration', function () {
-	$sorted = Filters::sort(iterator());
+	$sorted = (new Filters)->sort(iterator());
 	$res = [
 		[['a' => 55], ['k' => 22]],
 		[['a' => 77], ['k' => 33]],
@@ -72,7 +73,7 @@ test('re-iteration', function () {
 test('user comparison + array', function () {
 	Assert::same(
 		[2 => 33, 0 => 22, 1 => 11],
-		Filters::sort([22, 11, 33], fn($a, $b) => $b <=> $a)
+		(new Filters)->sort([22, 11, 33], fn($a, $b) => $b <=> $a)
 	);
 });
 
@@ -84,17 +85,18 @@ test('user comparison + iterator', function () {
 			[['a' => 77], ['k' => 33]],
 			[['a' => 55], ['k' => 22]],
 		],
-		exportIterator(Filters::sort(iterator(), fn($a, $b) => $b <=> $a)),
+		exportIterator((new Filters)->sort(iterator(), fn($a, $b) => $b <=> $a)),
 	);
 });
 
 
 test('array + by', function () {
+	$filters = new Filters;
 	Assert::equal(
 		[1 => (object) ['k' => 11], 0 => ['k' => 22], ['k' => 33]],
-		Filters::sort([['k' => 22], (object) ['k' => 11], ['k' => 33]], by: 'k'),
+		$filters->sort([['k' => 22], (object) ['k' => 11], ['k' => 33]], by: 'k'),
 	);
-	Assert::same([], Filters::sort([], by: 'k'));
+	Assert::same([], $filters->sort([], by: 'k'));
 });
 
 
@@ -105,7 +107,7 @@ test('iterator + by', function () {
 			[['a' => 55], ['k' => 22]],
 			[['a' => 77], ['k' => 33]],
 		],
-		exportIterator(Filters::sort(iterator(), by: 'k')),
+		exportIterator((new Filters)->sort(iterator(), by: 'k')),
 	);
 });
 
@@ -113,7 +115,7 @@ test('iterator + by', function () {
 test('callback + array + by', function () {
 	Assert::same(
 		[1 => 11, 0 => 22, 33],
-		Filters::sort([22, 11, 33], by: fn($a) => $a * 11)
+		(new Filters)->sort([22, 11, 33], by: fn($a) => $a * 11)
 	);
 });
 
@@ -125,14 +127,15 @@ test('callback + iterator + by', function () {
 			[['a' => 55], ['k' => 22]],
 			[['a' => 66], (object) ['k' => 11]],
 		],
-		exportIterator(Filters::sort(iterator(), by: fn($a) => -((array) $a)['k'])),
+		exportIterator((new Filters)->sort(iterator(), by: fn($a) => -((array) $a)['k'])),
 	);
 });
 
 
 test('array + byKey', function () {
-	Assert::same([1 => 11, 0 => 22, 33], Filters::sort([22, 11, 33]));
-	Assert::same([], Filters::sort([], byKey: true));
+	$filters = new Filters;
+	Assert::same([1 => 11, 0 => 22, 33], $filters->sort([22, 11, 33]));
+	Assert::same([], $filters->sort([], byKey: true));
 });
 
 
@@ -143,7 +146,7 @@ test('iterator + byKey', function () {
 			[['a' => 66], (object) ['k' => 11]],
 			[['a' => 77], ['k' => 33]],
 		],
-		exportIterator(Filters::sort(iterator(), byKey: true)),
+		exportIterator((new Filters)->sort(iterator(), byKey: true)),
 	);
 });
 
@@ -151,7 +154,7 @@ test('iterator + byKey', function () {
 test('user comparison + array + byKey', function () {
 	Assert::same(
 		[2 => 33, 1 => 11, 0 => 22],
-		Filters::sort([22, 11, 33], fn($a, $b) => $b <=> $a, byKey: true),
+		(new Filters)->sort([22, 11, 33], fn($a, $b) => $b <=> $a, byKey: true),
 	);
 });
 
@@ -163,7 +166,7 @@ test('user comparison + iterator + byKey', function () {
 			[['a' => 66], (object) ['k' => 11]],
 			[['a' => 55], ['k' => 22]],
 		],
-		exportIterator(Filters::sort(iterator(), fn($a, $b) => $b <=> $a, byKey: true)),
+		exportIterator((new Filters)->sort(iterator(), fn($a, $b) => $b <=> $a, byKey: true)),
 	);
 });
 
@@ -175,7 +178,7 @@ test('iterator + by + byKey', function () {
 			[['a' => 66], (object) ['k' => 11]],
 			[['a' => 77], ['k' => 33]],
 		],
-		exportIterator(Filters::sort(iterator(), byKey: 'a')),
+		exportIterator((new Filters)->sort(iterator(), byKey: 'a')),
 	);
 });
 
@@ -187,6 +190,13 @@ test('callback + iterator + by + byKey', function () {
 			[['a' => 66], (object) ['k' => 11]],
 			[['a' => 55], ['k' => 22]],
 		],
-		exportIterator(Filters::sort(iterator(), byKey: fn($a) => -((array) $a)['a'])),
+		exportIterator((new Filters)->sort(iterator(), byKey: fn($a) => -((array) $a)['a'])),
 	);
 });
+
+
+test('locale', function () {
+	$filters = new Filters;
+	$filters->locale = 'cs_CZ';
+	Assert::same([22, 2 => 'a', 1 => 'c', 4 => 'd', 3 => 'ch'], $filters->sort([22, 'c', 'a', 'ch', 'd']));
+});