.. highlight:: cpp .. _lang-millis: millis() ======== Returns the number of milliseconds since the Maple board began running the current program. This number will overflow (go back to zero) after approximately 50 days. Library Documentation --------------------- .. doxygenfunction:: millis Example ------- The following time prints the value returned by ``millis()`` roughly once per second:: unsigned int time; void setup() { } void loop() { SerialUSB.print("Time: "); time = millis(); // prints time since program started Serial.println(time); // wait a second so as not to send massive amounts of data delay(1000); } Tip --- Since the return value for ``millis()`` is an :ref:`unsigned long <lang-unsignedlong>`, overflow errors may occur if you try to do math with other data types, such as :ref:`ints <lang-int>`. See Also -------- - :ref:`micros <lang-micros>` - :ref:`delay <lang-delay>` - :ref:`delayMicroseconds <lang-delaymicroseconds>` .. include:: cc-attribution.txt