I have a value of "00.00.00"
in Time format and I want to convert it to a value in Date format, such as "2019-09-02 00.00.00"
.
You can use
DateTimeFormatter format = DateTimeFormatter.ofPattern("HH.mm.ss");
LocalDateTime dt = LocalDateTime.of(LocalDate.now(), LocalTime.parse(yourString, format));
Your result is not default of LocalDateTime so to get your result just use another formatter :
DateTimeFormatter format2 = DateTimeFormatter.ofPattern("uuuu-MM-dd HH.mm.ss");
String result = dt.format(format2);