[REBOL] Re: how do I get ampm format for time?
From: jeff:rebol at: 19-Jan-2001 11:39
Howdy, Bo:
> Before anyone else pipes in, I just realized I used a few
> extra characters. If I'm gonna try to do this succinctly,
> I might as well go all out, eh? ;-)
>
> time-ampm: func[dt][join dt // 12:0[pick"AP"dt < 12:0"M"]]
>
> I don't recommend doing this for readability's sake, but it
> does show the smartness of the language parser. And I did
> challenge someone to make it shorter...
>
> -Bo
Sweet and short, but it gives unusual results around noon and
midnight:
>> time-ampm 12:00
== "0:00PM"
>> time-ampm 24:00
== "0:00PM"
>> time-ampm :59
== "0:59AM"
>> time-ampm 12:59
== "0:59PM
It would be nice to be able to distinguish 12:00 AM from
12:00 PM and to have the typical digital clock format which
includes the hour 12-- so, a bit longer but well behaved
around lunch and the witching hour:
time-ampm: func [dt [time!] /dd/merid][
merid: pick [PM AM] found? all [24:0 > dt dt >= 12:0 ]
reduce [(dd: dt // 12:0) + pick [12:0 0] 1:0 > dd merid]
]
>> time-ampm 12:0
== [12:00 PM]
>> time-ampm 24:0
== [12:00 AM]
>> time-ampm 12:59
== [12:59 PM]
>> time-ampm :59
== [12:59 AM]
-jeff
