How can you assign a variable that is defined inside an if else statement

I need to create something that will find the current hour in GMT and convert it into EST.

When I attempt to compile and run the program I receive this error: currentHourEST cannot be resolved to a variable. I think that my issue is someplace down in the if else statements being that I assigned the variables wrong or something.

// Obtain total milliseconds since midnight, Jan 1, 1970
long totalMilliseconds = System.currentTimeMillis(); 

// Seconds
long totalSeconds = totalMilliseconds / 1000;  
long currentSecond = totalSeconds % 60;

// Minutes
long totalMinutes = totalSeconds / 60;
long currentMinute = totalMinutes % 60;

// Hours
long totalHours = totalMinutes / 60;
long currentHour = totalHours % 24; 

// Read in EST offset
long offSetAdded = currentHour - 5;

// If the time is negative make it a positive
if (offSetAdded > 0) {
 long currentHourEST = offSetAdded * -1;
} else {
 long currentHourEST = offSetAdded;
}

// Display time
System.out.println("The current time is " + currentHourEST + ":" + currentMinute + ":" + currentSecond);

System.out.println("Current time in GMT is " + currentHour + ":" + currentMinute + ":" + currentSecond);

I am using the if else statement to multiple the offSetAdded by -1 so that the hour, if it is negative when I subtract 5 from it, it becomes positive making it easier for people to see the hour. If the offSetAdded is positive, then it will print the currentHour just subtracted by 5.