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.



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.


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.


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 | .onion © Copyright 2024. (26 May 2024)