public static String getTimeUntilNow(String time) {
LocalDateTime now = LocalDateTime.now();
now = now.plusMinutes(1);
int hours = Integer.parseInt(time.split(":")[0]);
int minutes = Integer.parseInt(time.split(":")[1]);
LocalDateTime tocheck =
LocalDateTime.of(
now.getYear(),
now.getMonth(),
now.getDayOfMonth(),
hours,
minutes,
now.getSecond(),
now.getNano());
if (tocheck.isBefore(now)) {
tocheck = tocheck.plusDays(1);
}
Duration remaining = Duration.between(now, tocheck);
int rh = (int) remaining.toHours();
int rm = (int) remaining.toMinutes();
rm %= 60;
int ht = rh / 10;
int hs = rh % 10;
int mt = rm / 10;
int ms = rm % 10;
return ht + "" + hs + ":" + mt + "" + ms;
}
public static void main(String[] args) {
int startTime, endTime;
final int TIMES = 200_000;
final int FACTOR = 1_000_000;
int x;
StringBuilder string1 = new StringBuilder("");
StringBuilder string2 = new StringBuilder(TIMES * 4);
LocalDateTime now;
now = LocalDateTime.now();
startTime = now.getNano();
for (x = 0; x < TIMES; ++x) string1.append("Java");
now = LocalDateTime.now();
endTime = now.getNano();
System.out.println(
"Time with empty StringBuilder: " + ((endTime - startTime) / FACTOR + " milliseconds"));
now = LocalDateTime.now();
startTime = now.getNano();
for (x = 0; x < TIMES; ++x) string2.append("Java");
now = LocalDateTime.now();
endTime = now.getNano();
System.out.println(
"Time with empty StringBuilder: " + ((endTime - startTime) / FACTOR + " milliseconds"));
}