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C Programming
Convert __DATE__ to unsigned int
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<blockquote data-quote="Erik Cato" data-source="post: 1692169"><p>Hi group!</p><p></p><p>Anyone know a way to convert the __DATE__ predefined macro into a</p><p>unsigned int representing the current date? It should </p><p>be possible to make out what date it was from the beginning.</p><p>My idéa was this format: ((Year - 2000)*12 + (month - 1))*31 + day</p><p>So 12 Dec 2003 would result in: ((2003 - 2000)*12 + (12 - 1))*31 + 12 = 1469</p><p></p><p><OT></p><p>What im trying to accomplish is to display a number representing </p><p>the build date of the code in a 4-digit 7-segment display.</p><p></OT></p><p></p><p>Preferbly i would have a solution that does it at compile time?</p><p></p><p>Something like this:</p><p></p><p>#define DATE_AS_INT /* something nice here */</p><p></p><p>displayAsInt(DATE_AS_INT);</p><p></p><p>The next best thing is a function returning the int. But i cannot use </p><p>any library functions.</p><p></p><p>Like this</p><p></p><p>unsigned int getDateAsInt()</p><p>{</p><p> /* Code goes here */</p><p>}</p><p></p><p>displayAsInt(getDateAsInt());</p><p></p><p>The reason for the somewhat strange constraints is that im developing for</p><p>an embedded system and im having a little short on code memory. </p><p></p><p>Greatful for any suggestion!</p><p></p><p>//Erik</p></blockquote><p></p>
[QUOTE="Erik Cato, post: 1692169"] Hi group! Anyone know a way to convert the __DATE__ predefined macro into a unsigned int representing the current date? It should be possible to make out what date it was from the beginning. My idéa was this format: ((Year - 2000)*12 + (month - 1))*31 + day So 12 Dec 2003 would result in: ((2003 - 2000)*12 + (12 - 1))*31 + 12 = 1469 <OT> What im trying to accomplish is to display a number representing the build date of the code in a 4-digit 7-segment display. </OT> Preferbly i would have a solution that does it at compile time? Something like this: #define DATE_AS_INT /* something nice here */ displayAsInt(DATE_AS_INT); The next best thing is a function returning the int. But i cannot use any library functions. Like this unsigned int getDateAsInt() { /* Code goes here */ } displayAsInt(getDateAsInt()); The reason for the somewhat strange constraints is that im developing for an embedded system and im having a little short on code memory. Greatful for any suggestion! //Erik [/QUOTE]
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