Data logging: pause and resume

Projects Programming
1

Hello, am planning to stops the incoming data, say for example at 23:55:00 pm. And then, resumes again at 00:00:00 am. i do that because i want to use the data for something else. By the way, i am using PLX-DAQ ver2 to send the data to Excel and it's real time logging at a minute interval.
Here's what i've got so far

#include "EmonLib.h"
// Include Emon Library
EnergyMonitor emon1;
// Create an instance
unsigned long previousMillis = 0;
const unsigned long interval = 5000;
void setup()
{
  Serial.begin(9600);
  Serial.println("CLEARDATA");
  Serial.println("LABEL,Date,Time,Current,Power, millis()");
  
  emon1.current(1, 85.1);             // Current: input pin, calibration.
}

void loop()
{
double Irms = emon1.calcIrms(2580);  // Calculate Irms only
double Prms = Irms*230.0;


  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {

  Serial.print(Prms);           // Apparent power
  Serial.print(" ");
  Serial.println(Irms);             // Irms
  Serial.println(" ");
  
    Serial.println( (String) "DATA,DATE,TIME," + Irms + "," + Prms + "," + millis() + ",AUTOSCROLL_30");
  previousMillis = currentMillis;
  }
 }
2 
#include "EmonLib.h"
// Include Emon Library
EnergyMonitor emon1;
// Create an instance
unsigned long previousMillis = 0;
const unsigned long interval = 60000UL;
void setup()
{
  Serial.begin(9600);
  Serial.println("CLEARDATA");
  Serial.println("LABEL,Date,Time,Current,Power, millis()");
  
  emon1.current(1, 85.1);             // Current: input pin, calibration.

  double Irms = emon1.calcIrms(2580);  // Calculate Irms only
  double Prms = Irms*230.0;


  unsigned long currentMillis = millis();
  while (millis() - currentMillis <= interval) {

  Serial.print(Prms);           // Apparent power
  Serial.print(" ");
  Serial.println(Irms);             // Irms
  Serial.println(" ");
  
    Serial.println( (String) "DATA,DATE,TIME," + Irms + "," + Prms + "," + millis() + ",AUTOSCROLL_30");
    delay(1000); 
  previousMillis = currentMillis;
  }
}


void loop()
{

 }

i've tried using millis function, and is it doable if i do it like this? and add another while loop to wait for another 5 min then reset the millis and start the 1st while loop again?