Fix LocalDate and LocalDateTime conversion to Date

context/src/main/java/io/micronaut/runtime/converters/time/TimeConverterRegistrar.java

@@ -209,8 +209,8 @@ public void register(MutableConversionService conversionService) {
         addTemporalToDateConverter(conversionService, ZonedDateTime.class, ZonedDateTime::toInstant);
         // these two are a bit icky, but required for yaml parsing compatibility
         // TODO Micronaut 4 Consider deletion
-        addTemporalToDateConverter(conversionService, LocalDate.class, ld -> ld.atTime(0, 0).toInstant(ZoneOffset.UTC));
-        addTemporalToDateConverter(conversionService, LocalDateTime.class, ldt -> ldt.toInstant(ZoneOffset.UTC));
+        addTemporalToDateConverter(conversionService, LocalDate.class, ld -> ld.atStartOfDay(ZoneId.systemDefault()).toInstant());
+        addTemporalToDateConverter(conversionService, LocalDateTime.class, ldt -> ldt.atZone(ZoneId.systemDefault()).toInstant());
     }
 
     private <T extends TemporalAccessor> void addTemporalStringConverters(MutableConversionService conversionService, Class<T> temporalType, DateTimeFormatter isoFormatter, TemporalQuery<T> query) {

context/src/test/groovy/io/micronaut/runtime/converters/TimeConverterRegistrarSpec.groovy

@@ -0,0 +1,56 @@
+package io.micronaut.runtime.converters
+
+import io.micronaut.context.ApplicationContext
+import io.micronaut.core.convert.ConversionService
+import spock.lang.AutoCleanup
+import spock.lang.Shared
+import spock.lang.Specification
+
+import java.text.DateFormat
+import java.text.SimpleDateFormat
+import java.time.Instant
+import java.time.LocalDate
+import java.time.LocalDateTime
+import java.time.ZoneId
+import java.time.ZoneOffset
+import java.time.format.DateTimeFormatter
+
+class TimeConverterRegistrarSpec extends Specification {
+
+    @AutoCleanup
+    @Shared
+    ApplicationContext context = ApplicationContext.run()
+
+    static final String DATE_FORMAT = "yyyy-MM-dd"
+    static final String DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm"
+    static final String TEST_TIME_ZONE = "America/New_York"
+
+    void 'test converting LocalDate and LocalDateTime'() {
+        given:
+        def timeZone = TimeZone.default
+        TimeZone.default = TimeZone.getTimeZone(TEST_TIME_ZONE)
+        def conversionService = context.getBean(ConversionService)
+        def localDate = LocalDate.of(2024, 1, 1)
+        def localDateTime = LocalDateTime.of(2024, 1, 1, 2, 30)
+        def localDateStr = createDateTimeFormatter(DATE_FORMAT).format(localDate)
+        def localDateTimeStr = createDateTimeFormatter(DATE_TIME_FORMAT).format(localDateTime)
+        when:
+        def date = conversionService.convert(localDate, Date).orElse(null)
+        def dateTime = conversionService.convert(localDateTime, Date).orElse(null)
+        then:
+        def dateStr = createDateFormat(DATE_FORMAT).format(date)
+        dateStr == localDateStr
+        def dateTimeStr = new SimpleDateFormat(DATE_TIME_FORMAT).format(dateTime)
+        dateTimeStr == localDateTimeStr
+        cleanup:
+        TimeZone.default = timeZone
+    }
+
+    static DateTimeFormatter createDateTimeFormatter(String pattern) {
+        return DateTimeFormatter.ofPattern(pattern)
+    }
+
+    static DateFormat createDateFormat(String pattern) {
+        return new SimpleDateFormat(pattern)
+    }
+}