ExtensionMethods.kt

fun LocalDate.toStr(format:String = "dd/MM/yyyy") = DateTimeFormatter.ofPattern(format).format(this)

fun String.toDate(format:String = "dd/MM/yyyy") = LocalDate.parse(this, DateTimeFormatter.ofPattern(format))

@Test
fun `Test LocalDate#toStr extension method`() {
  Assert.assertEquals(LocalDate.of(1970, 1, 1).toStr(), "01/01/1970")
}

@Test
fun `Test String#toLocalDate extension method`() {
  Assert.assertEquals("01/01/1970".toLocalDate(), LocalDate.of(1970, 1, 1))
}