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<div class="">On Jan 31, 2019, at 7:18 AM, Christopher Wong <<a href="mailto:christopher.wong@axis.com" class="">christopher.wong@axis.com</a>> wrote:</div>
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Hi,<br class="">
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I think the tzdb is very good with its history. However, I would like to minimize the size and has been looking into how to achieve that.<br class="">
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Will it be of any interest with an option in zic to include only data from a certain year onward?<br class="">
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What is the best way?<br class="">
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1. Remove the Rules and Zone entries not relevant for that year onward during the parsing. Tried this, but ended up with with some nasty warnings.<br class="">
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2. Make changes in writezone-function. Trying this now, but I am getting confused with types, omittype, typemap, and so on.<br class="">
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It would be good if someone that knows the code can give me some hints if this is the right place to make such a change.<br class="">
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BR,<br class="">
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Christopher Wong<br class="">
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<div class="">Yes, this is a very useful feature. I did it years ago for an embedded system product. The right answer is 2 -- a new command line switch in zic to specify the start year, and a simple change in writezone to omit writing data for transitions
older than the start date. You have to be a bit careful to make sure that the rule in effect AT the start date appears in the output, i.e., not just transitions that are later than the start date.</div>
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<div class="">I don't have the original vs. changed code at hand, unfortunately.</div>
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<div class="">By the way, if you create such trimmed output files, they are indeed a lot shorter. But in addition, there are many duplicates because a lot of locations have common transitions if you only consider recent ones. (In our case we only needed to
handle time stamps newer than the first product release date, so I started the files at 2002.) This allows replacing many of the files with softlinks, or better still if you have them, hardlinks, for additional space savings.</div>
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<div class=""><span class="Apple-tab-span" style="white-space:pre"></span>paul</div>
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