Five easy pieces

[sjt]

Doesnt get easier than that!

But the challenge is to code it in q.

[murrmack]

You can use the built in .h.iso8601

q).h.iso8601 .z.p 
"2022-03-02T12:27:37.506760000" 
q)-6_.h.iso8601 .z.p 
"2022-03-02T12:27:37.506"

 

[sjt]

Too easy? Too unnecessary?  Lets kick it up.

q)ts: .z.d+.z.t 
q).h.iso8601 ts 
"2022-03-02T09:12:34.684000000" 
q).dt.fmtd[;ts] each `iso`dmy`mdy 
"2022-03-02" "2/3/2022" "3/2/2022"

Write .dt.fmtd without control words: no if, do, while or Cond.

[sjt]

Elegant! But is the datetime type not deprecated?

[sjt]

Nice! Though I always wonder about using powerful ssr to replace just one character with another.

 

q)?[;”-“;] . reverse 1(“.”=) string `date$.z.p “2022-03-03”

 

(The Zen monks wanted to play.)

[fbodon]

I would do

@[-6_string .z.p; 4 7 10; :; “–T”]

or if you prefer narrow square brackets then

@[; 4 7 10; :; “–T”] -6_string .z.p

[davidcrossey]

I took a similar approach

@[;4 7;:;”-“] string `datetime$.z.p

 

[fbodon]

Haha. Nice! The good old datetime! I already erased it from my memory

[davidcrossey]

Here is my quick attempt for which I’m sure there is a much more elegant solution

.dt.fmtd:{(`iso`dmy`mdy!({ssr[string x;”.”;”-“]};{“/” sv string `dd`mm`year$x};{“/” sv string `mm`dd`year$x}))[x] `date$y}

 

[davidcrossey]

Very well gentlemen, I raze you a substitute for our departed  `datetime type with `date`time

raze (ssr[;”.”;”-“];”T”,)@’string `date`time$.z.p

/ or alternatively

“T” sv (ssr[;”.”;”-“];::)@’string `date`time$.z.p

 

 

[rolf]

q)f:"T"0:2 1#"dt"$ 
q)f .z.p "2022-03-04T11:07:52.077" 

/ if you want to be picky about the type 
q)f:first"T"0:2 1#"dt"$ 
q)f .z.p "2022-03-04T11:08:49.988"

 

[sjt]

Ingenious use of Prepare Text!

Maybe a simpler version of it would be "T"sv string"dt"$.z.p.

[rolf]

0: gets you the dashes in the date

[sjt]

I speculate its because its the international standard for dates so Prepare Text uses it.

At any rate I should note in the Reference that it does so.

[davidcrossey]

I would love to know how / why this period to dash conversion is happening if anyone can shed some light?