As a Real Programmer™ I have developed such a deep fear of anything time and date related that I would fully endorse dispatching an API call to the tz_database instead of attempting any fucking part of this.
Kids, it’s fine to meme about silly stuff… but date and time is deadly serious, regardless of how careful you think you’re being you are wrong.
Do you know how many timezones there are in Indiana? No? Look it up and scream in horror.
What if I told you that weekend days are locale dependent?!
Time and date is the black hole where optimistic programmers go to die. Nothing is simply with localisation and if you think it is, you mustn’t have worked enough with it.
Source: Run a system that schedules millions of interactions across the world and deeply depend on this. The amount of code to manage and/or call out to external services to give us information about time zones, summer time, locale specific settings, day names, calendar systems, week numbers etc etc.
IMO every datetime should be in utc, and variables for datetimes should either be suffixed “Utc” or have a type indicating their time zone (DateTimeOffset or UtcDateTime etc). Conversion to local time happens at the last possible second (e.g. in the view model or an outbound http request parameter). Of course that doesn’t solve the problem of interoperating with other morons programmers who don’t follow these rules, but it keeps things a lot neater locally.
Scheduling based on regional time conventions (holidays, weekends, etc) is just not great though.
Throwing UTC everywhere doesn’t solve comparisons around leap seconds. I’m sure they’re other issues with this method, but this is kinda the point of “just use a library”. Then it’s someone else’s problem.
I’m a .NET dev, I don’t have a concept of “just use a library.” Everything is a library. I don’t mean “using int for datetimes is ok as long as you label it utc,” I just mean “don’t deal with time zones.”
Unix is the easiest format I’ve used. It’s easy to parse, it’s consistent, there’s not usually competing unix like formats, it converts perfectly to other time formats, most file explorers can immediately sort it correctly, and it’s clearly the date from which the universe spawned into existence.
I also really like the Bitcoin block number. It will likely be one of the most provable records of time passing, but not as convienent for tracking or converting time.
Here’s a fun thought experiment: What gregorian year and date will the spacian date value of zero correlate to? Trick question.
The atomic clock on the moon and every other celestial body colonized will simply start at zero, and thanks to relativity it will not actually be the same rate of time passing as on earth.
This reminds me of something I saw online maybe 15-20 years ago now. Someone created a torrent with a name like “every IP address ever (hacking tool)” which ended up having thousands of people seeding it. It was just a text file with every IPv4 from 0.0.0.0 to 255.255.255.255 😂
That file would be ungodly large. There are 2^128 possible addresses, each weighing in at 128 bits, 16 bytes. 16 bytes times 340 trillion trillion trillion. That puts us around 5.44 trillion Zettabytes. The estimates I’ve seen for worldwide data storage sit aroun 60-70 zettabytes.
I tought myself programming as a kid in the 80s and 90s, and just got used to diagnostic print statements because it was the first thing that occurred to me and I had no (advanced) books, mentors, teachers, or Internet to tell me any different.
Then in university one of my lecturers insisted that diagnostic prints are completely unreliable and that we must always use a debugger. He may have overstated the case, but I saw that he had a point when I started working on the university’s time-sharing mainframe systems and found my work constantly being preempted and moved around in memory in the middle of critical sections. Diagnostic prints would disappear, or worse, appear where, in theory, they shouldn’t be able to, and they would come and go like a restless summer breeze. But for as much as that lecturer banged on about debuggers, he hardly taught us anything about how to use them, and they confused the hell out of me, so I made it through the rest of my degree without using debuggers except for one part of one subject (the “learn about debuggers” part).
Over 20 years later, after a little professional work and a lot of personal projects and making things for other non-coding jobs I’ve had, I still haven’t really used debuggers much. But lately I’ve been forcing myself to use them sometimes, partly to help me pick apart quirks in external libraries that I’m linking, and partly because I’d like to start using superscalar instructions and threading in my programs, and I remember how that sort of thing screwed up my diagnostic prints in university.
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