# Suggestion: "Julia Happy Releases" on Happy dates/numbers ( marketing )

**URL:** <https://discourse.julialang.org/t/suggestion-julia-happy-releases-on-happy-dates-numbers-marketing/19194>\
**Category:** Offtopic\
**Created:** [January 2, 2019, 2:19pm UTC](https://discourse.julialang.org/t/suggestion-julia-happy-releases-on-happy-dates-numbers-marketing/19194 "2019-01-02T14:19:49Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![ImreSamu](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/imresamu/32/20677_2.png) [@ImreSamu](https://discourse.julialang.org/u/ImreSamu)\
**Post date:** [January 2, 2019, 2:19pm UTC](https://discourse.julialang.org/t/suggestion-julia-happy-releases-on-happy-dates-numbers-marketing/19194/1 "2019-01-02T14:19:49Z")

</div>

🙂

**For Marketing reason**  
I suggest the habit of **“Julia Happy Releases”**  
based on: [Happy number - Wikipedia](https://en.wikipedia.org/wiki/Happy_number)

### for example: ideal ( happy ) days for Julia 1.1.0 (2019.Q1)

YYYYMMDD  
20190102 Happy  
20190104 Happy  
20190113 Happy  
20190120 Happy  
20190123 Happy  
20190131 Happy  
20190201 Happy  
20190202 Happy  
20190207 Happy  
20190210 Happy  
20190213 Happy  
20190220 Happy  
20190223 Happy  
20190226 Happy  
20190309 Happy  
20190311 Happy  
20190312 Happy  
20190321 Happy  
20190322 Happy

## calculated by:

```julia
using Dates
function is_happy( n::Int64 )
 x=n 
 seen_numbers = Set{Int64}()
 while (x>1) && (x ∉ seen_numbers)
   push!(seen_numbers,x )
   x = sum(digits(x).^2)
 end
 if x==1
    println( n ," Happy ")
 end   
end
function is_happy_release_day(d::Date)
    n=year(d)*10000 + month(d)*100+ day(d)    
    is_happy(n)
end    
for d=Date(2019,1,1):Day(1):Date(2019,3,31)
  is_happy_release_day(d)
end

```

### Julia Conference 2019 - Happy days:

- [JuliaCon 2019: July 21st to 27th in Baltimore, MD, USA](https://discourse.julialang.org/t/juliacon-2019-july-21st-to-27th-in-baltimore-md-usa/18750)

The ideal release day :

```julia
julia> for d=Date(2019,7,21):Day(1):Date(2019,7,27)
         is_happy_release_day(d)
       end
20190727 Happy  

```