When you think about it storing a date with 6 bytes would take more space than using Unix time which would give both time and date in four bytes. Y2K38 is the real problem. Y2K was a problem with software written by poor devs that were trying to save disk space by actually using more disk space than needed.
This comes to mind:
You don’t store dates as Unix time. Unix timestamps indicate a specific point in time. Dates are not a specific point in time.
You also don’t store dates in a string that you’ll have to parse later. I’ve had to deal with MM-DD-YYYY vs. DD-MM-YYYY problems more times than I can count.
And you understand that you could have a date in unix time and leave the time to be midnight, right? You’d end up with an integer that you could sort without having to parse every goddamn string first.
And for God’s sake if you insist on using strings for dates at the very least go with something like YYYY-MM-DD. Someone else may someday have to deal with your shit code, at the very least make the strings sortable FFS.
You also don’t store dates in a string that you’ll have to parse later
Depends. If the format is clearly defined, then there’s no problem. Or could use a binary format. The point is that you store day/month/year separately, instead of a Unix timestamp.
And you understand that you could have a date in unix time and leave the time to be midnight, right?
No, you can’t.
First of all, midnight in what timezone? A timestamp is a specific instant in time, but dates are not, the specific moment that marks the beginning of a date depends on the timezone.
Say you store the date as midnight in your local timezone. Then your timezone changes, and all your stored dates are incorrect. And before you claim timezones rarely change, they change all the time. Even storing it as the date in UTC can cause problems.
You use timestamps for specific instances in time, but never for storing things that are in local time. Even if you think you are storing a specific instant it, time, you aren’t. Say you make an appointment in your agenda at 14:00 local time, you store this as a Unix timestamp. It’s a specific instant in time, right? No, it’s not. If the time zone changes so, for example, DST goes into effect at a different time, your appointment could suddenly be an hour off, because that appointment was not supposed to be at that instant in time, it was supposed to be at 14:00 in the local timezone, so if the timezone changes the absolute point in time of that appointment changes with it.
First of all, midnight in what timezone? A timestamp is a specific instant in time, but dates are not, the specific moment that marks the beginning of a date depends on the timezone.
What are you talking about? The same problems apply no matter which format you’re talking about. Depending on which side of the dateline your timezone is on you could wind up with different dates.
Does your janky string format of “18-03-2024” suddenly has to become aware of the timezone if I tack on a “0:00” at the end of it? Or maybe you always will have timezone issues no matter what the precision of the time you want to store.
I think you got it in your mind that you can’t do anything other than Timestamp=getdate() and if it’s a date only you have to use a string. That’s not the case. You can indeed translate a date into any number of formats, unix time is one of them. I assure you that 1710720000 will translate to the same janky “18-03-2024” format you’re using every single time unless you deliberately mess with timezones in code where you admit that you don’t want to deal with timezones. But your string jankiness break simply by someone parsing it with MM-dd-yyyy just as easily and this may not require someone to do something to deliberately break it. Depending on the library that’s being used and the localization settings of the OS, this can happen automatically. If your code will break because someone has different OS settings than yours, you are writing bad code.
If the goal is to save space then your format uses 10 bytes, while the timestamp uses 4 (with Y2K38 problems) or 8 with 64 bit Epoch time. If you’re not too worried about saving space (you really shouldn’t be these days) then use the appropriate structs defined by the language you’re using and the DB you’re using.
Even this would be better than a string:
struct { int year byte month byte day }
Six bytes as opposed to 10 and there would be no issues with confusion with the dd and MM parts of the string. It’s still shit (use existing date libraries instead) but still won’t have as many problems than what you’re doing. Seriously anything is better than just dumping a date into a string. And as I say, using the dd-MM-yyyy format is bad for multiple reasons.
Though congratulations, you’ve convinced me that Y2K might’ve been a bigger problem than I thought given how adamant you are about repeating similar mistakes that caused those issues. I guess even when there’s very obvious problems with how someone’s doing things they will insist on doing things that way even when it’s pointed out all the problems with it. I can imagine someone in the 80s and 90s pointing out the Y2K problem to someone writing the code and getting some arrogant bullshit about how only mid-level programmers worry about that. “Experts put dates in strings LOL!”
