No, my question is NOT solved yet...
ah ok sorry, i don't know this...

#include <M5Stack.h>
#define TFT_GREY 0x5AEB

uint32_t targetTime = 0; // for next 1 second timeout
static uint8_t conv2d(const char* p); // Forward declaration needed for IDE 1.6.x
uint8_t hh = conv2d(TIME), mm = conv2d(TIME + 3), ss = conv2d(TIME + 6); // Get H, M, S from compile time

byte omm = 99, oss = 99;
byte xcolon = 0, xsecs = 0;
unsigned int colour = 0;

void setup(void) {
//Serial.begin(115200);
M5.begin();
// M5.Lcd.setRotation(1);
M5.Lcd.fillScreen(TFT_BLACK);

M5.Lcd.setTextSize(1);
M5.Lcd.setTextColor(TFT_YELLOW, TFT_BLACK);

targetTime = millis() + 1000;
}

void loop() {
if (targetTime < millis()) {
// Set next update for 1 second later
targetTime = millis() + 1000;

// Adjust the time values by adding 1 second
ss++;              // Advance second
if (ss == 60) {    // Check for roll-over
  ss = 0;          // Reset seconds to zero
  omm = mm;        // Save last minute time for display update
  mm++;            // Advance minute
  if (mm > 59) {   // Check for roll-over
    mm = 0;
    hh++;          // Advance hour
    if (hh > 23) { // Check for 24hr roll-over (could roll-over on 13)
      hh = 0;      // 0 for 24 hour clock, set to 1 for 12 hour clock
    }
  }
}


// Update digital time
int xpos = 0;
int ypos = 85; // Top left corner ot clock text, about half way down
int ysecs = ypos + 24;

if (omm != mm) { // Redraw hours and minutes time every minute
  omm = mm;
  // Draw hours and minutes
  if (hh < 10) xpos += M5.Lcd.drawChar('0', xpos, ypos, 8); // Add hours leading zero for 24 hr clock
  xpos += M5.Lcd.drawNumber(hh, xpos, ypos, 8);             // Draw hours
  xcolon = xpos; // Save colon coord for later to flash on/off later
  xpos += M5.Lcd.drawChar(':', xpos, ypos - 8, 8);
  if (mm < 10) xpos += M5.Lcd.drawChar('0', xpos, ypos, 8); // Add minutes leading zero
  xpos += M5.Lcd.drawNumber(mm, xpos, ypos, 8);             // Draw minutes
  xsecs = xpos; // Sae seconds 'x' position for later display updates
}
if (oss != ss) { // Redraw seconds time every second
  oss = ss;
  xpos = xsecs;

  if (ss % 2) { // Flash the colons on/off
    M5.Lcd.setTextColor(0x39C4, TFT_BLACK);        // Set colour to grey to dim colon
    M5.Lcd.drawChar(':', xcolon, ypos - 8, 8);     // Hour:minute colon
    xpos += M5.Lcd.drawChar(':', xsecs, ysecs, 6); // Seconds colon
    M5.Lcd.setTextColor(TFT_YELLOW, TFT_BLACK);    // Set colour back to yellow
  }
  else {
    M5.Lcd.drawChar(':', xcolon, ypos - 8, 8);     // Hour:minute colon
    xpos += M5.Lcd.drawChar(':', xsecs, ysecs, 6); // Seconds colon
  }

  //Draw seconds
  if (ss < 10) xpos += M5.Lcd.drawChar('0', xpos, ysecs, 6); // Add leading zero
  M5.Lcd.drawNumber(ss, xpos, ysecs, 6);                     // Draw seconds
 }

}
}

static uint8_t conv2d(const char* p) {
uint8_t v = 0;
if ('0' <= *p && *p <= '9')
v = *p - '0';
return 10 * v + *++p - '0';
}