Add LocalDate.atTime function

Author: ilya-g

core/commonMain/src/LocalDate.kt

@@ -37,6 +37,9 @@ public expect class LocalDate : Comparable<LocalDate> {
  */
 public fun String.toLocalDate(): LocalDate = LocalDate.parse(this)
 
+public fun LocalDate.atTime(hour: Int, minute: Int, second: Int = 0, nanosecond: Int = 0): LocalDateTime =
+    LocalDateTime(year, monthNumber, dayOfMonth, hour, minute, second, nanosecond)
+
 
 /**
  * @throws DateTimeArithmeticException if arithmetic overflow occurs or the boundaries of [LocalDate] are exceeded at

core/commonTest/src/LocalDateTest.kt

@@ -58,6 +58,14 @@ class LocalDateTest {
         checkLocalDateTimePart(date, datetime)
     }
 
+    @Test
+    fun atTime() {
+        val date = LocalDate(2016, 2, 29)
+        val datetime = date.atTime(12, 1, 59)
+        checkComponents(datetime, 2016, 2, 29, 12, 1, 59)
+        checkLocalDateTimePart(date, datetime)
+    }
+
     @Test
     fun addComponents() {
         val startDate = LocalDate(2016, 2, 29)