Time

SimpleDateFormat

var currentTime by remember { mutableStateOf("") }

LaunchedEffect(Unit) {
    while (true) {
        currentTime = SimpleDateFormat("HH:mm", Locale.getDefault()).format(Date())
        delay(1000L)
    }
}

DateTimeFormatter

LocalDateTime.now().format(
    DateTimeFormatter.ofPattern(
        "yyyy-MM-dd HH:mm:ss"
    )
)

Parse

val formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy HH:mm:ss")
val parsed = LocalDateTime.parse("12/04/2026 14:30:00", formatter) // skip formatter if parse source is ISO time
val millis = parsed
  .atZone(ZoneId.systemDefault())
  .toInstant()
  .toEpochMilli()

• Date only

val formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy")
val parsed = LocalDate.parse("12/04/2026", formatter)
val millis = parsed
    .atStartOfDay(ZoneId.systemDefault())
    .toInstant()
    .toEpochMilli()