Having problem with triggering a IF statement using DS3231 rtc & Arduino Mega.

This was my code for triggering the IF statement. Please help guysss. I wanted to trigger and use the IF statement forever if the time already hits the required time. Thank youu!

#include <DS3231.h>
DS3231 rtc(SDA, SCL);
int Light = 1;
void setup()
pinMode(Light, OUTPUT);
//The following lines can be uncommented to set the date and time
//rtc.setDOW(WEDNESDAY); // Set Day-of-Week to SUNDAY
//rtc.setTime(13, 30, 50); // Set the time to 12:00:00 (24hr format)
//rtc.setDate(1, 1, 2014); // Set the date to January 1st, 2014

void loop()
String TIME = rtc.getTimeStr();

//NOTE! For example my time now is 13:30:50.

if (TIME ?? What do i put here?) //If the time already hits 20:00:00 and so on. I want to use the function inside the IF, forever. By means that. The light will be ON forever.
digitalWrite(Light, LOW); //ON
else //If the time does not still hit 20:00:00 it will do this function.
digitalWrite(Light, LOW); //ON
digitalWrite(Light, HIGH); //OFF

Serial.print(" ");
Serial.print(" -- ");

delay (1000);

Set a boolean variable to false. Once the time equals the target value set the boolean to true. Execute any required code only when the boolean is true.

Why are you using Strings ?

Can you be more specific sir? Please. I'm having trouble understanding it. Thank you @UKHeliBob

Pseudo code :

okToRun = false

start of loop()
  if current time equals trigger time
    okToRun = true
  end if

  if okToRun is true
    run the code required
  end if
end of loop()

Binggo! Just tried it with my code. Thank you so much sir! @UKHeliBob