Reseting timer counter

hi all,

am trying reset counter turn off backlight of lcd. use bit of code start in loop

code: [select]

backlightstart = millis();
  if (backlightstart - previoustime >= backlightoff)
  {
    previoustime = backlightstart;
    lcd.nobacklight();
  }

it works too. how reset timer here when exiting function example ?

it tried backlightstart = millis() , previoustime = 0 neither worked.

not sure mean, updating previoustime backlightstart (or millis) keep backlight on.
leo..

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