4 mo. ago • 93%

Amazon should've made Prime Day fall on a date corresponding to an actual three-digit prime number.

Amazon is running a Prime Day sale on July 16 and 17. Setting aside the fact that this is two separate days, neither 716 nor 717 are prime numbers. They should've done 7/19 instead.

43 comments

dd/mm/yyyy

1607 is prime

40
- I maintain that dd/mm/yyyy and mm/dd/yyyy are stupid.
  
  Big -> small is how we read numbers:
  
  yyyy/mm/dd
  
  32
  
  I prefer the simple dy/my/dy/my format (with the year reversed for added ease of use). For example, today would be 14/02/70/72.
  
  NIST and ISO have stopped responding to my emails, but I'm optimistic that the Türk Standardları Enstitüsü will eventually adopt it as their preferred standard.
  
  48
  
  ISO8601 club
  
  23
  
  Yeah, but you have to admit mm/dd/yyyy is way more stupid. Small -> big makes more sense than middle -> small -> big
  
  14
  
  Yes, and recurring dates naturally drop the year, so MM/DD better fits that general rule.
  
  4
  
  What if we just count all the nanoseconds since 1601 and divide by 100.
  
  I still don't get that timestamp approach. Especially after learning how unix/linux handle it...
  
  At least modern AD tools can automatically do the date conversions now.
  
  3
  
  Yes but small is more relevant since you're more likely to know the big. therefore i propose we put minutes ahead of hours.
  
  1
  
  ^^ This is the only acceptable way to write out the date numerically. I'll die on this hill.
  
  1
- You mean YYYY-MM-DD right? Right?!?
  
  11
  
  That would not give a prime number
  
  2
167 is prime though?

34
- But 197 satisfies all
  
  7
July 16th is the 197th day of the year on non leap years. July 17th is the 199th day of the year on leap years.

Both of those are prime.

19
Please don't ascribe any more meaning to prime day other than a cynical late-stage-capitalist plot for money to flow from the masses to bezos.

19
- No, I'm taking back the word "prime" from a company that shouldn't have exclusive rights to define the term. I'm not going to cede that territory just because I don't like the company.
  
  2
  
  seems like the opposite, I'd suggest to stop reminding people that amazon prime day is a thing
  
  3
What about people using the normal date system

18
- ISO 8601 is the only normal date system.
  
  19
How the hell is 717 not a prime number? Who fucked that up? I vote we just change that

13
- Divisible by 3. Easy to check since 7 + 1 + 7 = 15 which is divisible by 3.
  
  3
  
  Oh awesome that's a neat trick I've never seen before. How does that work? For a number like 700 for example, 7 + 0 + 0 = 7 but 700 is visible by 10.
  
  4
How often do prime numbers occur in epoch time?

9
- Well the convention was to store it as a 32 bit signed integer, so that is any number from -2^31 to (2^31 - 1). Prime numbers are formally defined as a subset of whole numbers, so let's ignore the negative numbers and the number zero.
  
  Fun fact: the largest signed 32-bit integer is itself a prime. And the wikipedia page lists it as the 105,097,565th prime.
  
  By the time we hit the 2038 problem, there will have been about 105 million seconds since 1970 where the Unix time was a prime number. And it's a 10-digit number in base 10, where prime frequency is something about 4% of the numbers.
  
  Does that answer your question about prime frequency today? Eh, I'm sure someone else can figure that out. If not, I'll probably have to wait until I'm in front of a computer.
  
  3

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