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Easter date calculations

When you create a calendar, like OOoCalendar, it’s nice, if the calendar already calculates holidays. One of the holidays, that is every year on a somewhat different date is Easter. There are many other Christian holidays that depend on the Easter day like 40 days after Easter is Ascension Day.

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Timezones

Do you know the “Olson database”? It’s the database in which all the timezones of the world are described. The timezones of the present - and also of the past. See the wikipedia article tz database for more information.

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Big or Little

Every number has an ending. Sometimes it’s big, sometimes it’s little. When you are dealing with a number, that’s greater than what fits into 1 byte, you’ll need more space to store the number. Then the order of the bytes matters. This post is about the endianess, whether it’s big-endian or little-endian.

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Providing a dual stack service behind a native ipv6 and carrier-grade NAT ISP

Suppose, you have an ISP that provides you with native ipv6 connectivity. This means, you have been assigned a globally routeable IP version 6 address -yay!! However, this comes with a cost: You don’t have a globally routeable IP version 4 address, not even a dynamic one. And this is still necessary, if you want to be able to reach your service, e.g. from cell phone networks.

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Andreas Dangel | subscribe via RSS | adangel | © Copyright 2018. adangel.org (03 October 2018)