added filters |localDate

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 filter |localDate",
 		"nette/utils": "to use filter |webalize",
 		"nette/php-generator": "to use tag {templatePrint}"
 	},

src/Latte/Essential/CoreExtension.php

@@ -145,6 +145,7 @@ public function getFilters(): array
 			'join' => [$this->filters, 'implode'],
 			'last' => [$this->filters, 'last'],
 			'length' => [$this->filters, 'length'],
+			'localDate' => [$this->filters, 'localDate'],
 			'lower' => extension_loaded('mbstring')
 				? [$this->filters, 'lower']
 				: fn() => throw new RuntimeException('Filter |lower requires mbstring extension.'),

src/Latte/Essential/Filters.php

@@ -692,6 +692,37 @@ public function number(
 	}
 
 
+	/**
+	 * Local date formatting.
+	 * https://unicode-org.github.io/icu/userguide/format_parse/datetime/#datetime-format-syntax
+	 */
+	public function localDate(string|int|\DateTimeInterface|null $time, string $df = 'medium'): ?string
+	{
+		if (!preg_match('#^(short|medium|long|full|)\+?(time(\+sec)?)?$#', $df, $m)) {
+			throw new \InvalidArgumentException("Unknown date format '$df'.");
+		} elseif ($time == null) { // intentionally ==
+			return null;
+		} elseif (is_numeric($time)) {
+			$time = (new \DateTime)->setTimestamp((int) $time);
+		} elseif (is_string($time)) {
+			$time = new \DateTime($time);
+		}
+
+		$df = match ($m[1]) {
+			'short' => \IntlDateFormatter::SHORT,
+			'medium' => \IntlDateFormatter::MEDIUM,
+			'long' => \IntlDateFormatter::LONG,
+			'full' => \IntlDateFormatter::FULL,
+			'' => \IntlDateFormatter::NONE,
+		};
+		$tf = isset($m[2]) ? (isset($m[3]) ? \IntlDateFormatter::MEDIUM : \IntlDateFormatter::SHORT) : \IntlDateFormatter::NONE;
+		$formatter = new \IntlDateFormatter($this->getLocale('localDate'), $df, $tf);
+		$res = $formatter->format($time);
+		$res = preg_replace('~(\d\.) ~', "\$1\u{a0}", $res);
+		return $res;
+	}
+
+
 	private function getLocale(string $name): string
 	{
 		if ($this->locale === null) {

tests/filters/localDate.phpt

@@ -0,0 +1,50 @@
+<?php
+
+/**
+ * Test: Latte\Essential\Filters::localDate()
+ */
+
+declare(strict_types=1);
+
+use Latte\Essential\Filters;
+use Tester\Assert;
+
+require __DIR__ . '/../bootstrap.php';
+
+
+test('no locale', function () {
+	$filters = new Filters;
+
+	$filters->localDate(0);
+});
+
+
+test('types of value', function () {
+	$filters = new Filters;
+	$filters->locale = 'cs_CZ';
+
+	Assert::null($filters->localDate(null));
+	Assert::same("23.\u{a0}1.\u{a0}1978", $filters->localDate(254_400_000));
+	Assert::same("5.\u{a0}5.\u{a0}1978", $filters->localDate('1978-05-05'));
+	Assert::same("5.\u{a0}5.\u{a0}1978", $filters->localDate(new DateTime('1978-05-05')));
+});
+
+
+test('date/time formats', function () {
+	$filters = new Filters;
+	$filters->locale = 'cs_CZ';
+
+	// date format
+	Assert::same('05.05.78', $filters->localDate(new DateTime('1978-05-05'), 'short'));
+	Assert::same("5.\u{a0}5.\u{a0}1978", $filters->localDate(new DateTime('1978-05-05'), 'medium'));
+	Assert::same("5.\u{a0}května 1978", $filters->localDate(new DateTime('1978-05-05'), 'long'));
+	Assert::same("pátek 5.\u{a0}května 1978", $filters->localDate(new DateTime('1978-05-05'), 'full'));
+
+	// time format
+	Assert::same('12:13', $filters->localDate(new DateTime('12:13:14'), 'time'));
+	Assert::same('12:13:14', $filters->localDate(new DateTime('12:13:14'), 'time+sec'));
+
+	// combined
+	Assert::same('05.05.78 12:13', $filters->localDate(new DateTime('1978-05-05 12:13:14'), 'short+time'));
+	Assert::same('05.05.78 12:13:14', $filters->localDate(new DateTime('1978-05-05 12:13:14'), 'short+time+sec'));
+});