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How can I store a 13 digits int in Arduino?

For example, current timestamp is: 1500666822235

An uint32_t can only hold 10 digits max.

64 bits integer does not seem to be supported on RFduino.

  • Where they come from? As strings, sequence of bytes ...? – user31481 Jul 21 '17 at 20:00
  • They're timestamps of sensor logging application (accel, gyro). It comes from combining millis (uptime) and RTC (absolute time). – Dzung Nguyen Jul 22 '17 at 2:13
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18446744073709551615
That 20 digits. It is the maximum value of a uint64_t. Even the Arduino Uno can use the uint64_t. Perhaps the Serial.print does not support it, but the compiler supports it.

Which processor does your RFduino have ?

Where does the timestamp come from ? Perhaps you are asking the wrong question. Perhaps this is a xy-problem.

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How can I store a 13 digits int in Arduino?

create a multi-byte type.

a 40-bit (32+8 bits), or a 96-bit (32+32+32) would hold a ton.

or BCD.

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