I have a Sparkfun Redboard (an Arduino Uno like board based on the Atmega328P and programmed with the Arduino bootloader).

I have been trying to make an accurate clock without an RTC with an LCD screen and it's been hard.

Does the Sparkfun Redboard have built-in RTC?

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    Sparkfun Redboard is NOT Arduino Uno – jsotola Dec 9 '17 at 23:13
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    the schematic is right on the sparkfun.com website ... have you looked at it? – jsotola Dec 9 '17 at 23:15
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    @jsotola yes I have p.s. it works like an Arduino uno – Redstone Assassin Dec 10 '17 at 18:37

Sparkfun Redboard and Arduino Uno do not have built-in RTC.

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The new "Sparkfun Redboard Turbo" does have an RTC on pins A5 and AREF

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