Re: Problem printing 24 hour times OR a stupid mistake

[Dennis Williamson]

On Sun, Jan 9, 2022, 6:57 AM Chris Elvidge <celvidge001@gmail.com> wrote:

> On 08/01/2022 15:15, Chris Elvidge wrote:
> > Given tim12="7:00 am" and tim24=$(date -d"$tim12" +"%H%M")
> >
> > printf '%04d' "$tim24" prints 0488; '%04o' will output 0700
> >
> > But if tim12="7:00 pm" and tim24=$(date -d"$tim12" +"%H%M")
> > '%04d' gives the correct output 1900 but '%04o' gives 3554
> >
> > I have got round the problem with tim24=$(date -d"$tim12" +"%-H%M") i.e.
> > stripping leading zeros, but is there any way to force printf to
> > recognise 0700 as a decimal number?
> >
>
> The stupid mistake is treating 0700 as a number - it is a string after
> all, %H%M is a 4 character sequence.
> printf '%s\n' "$(date -d"$tim12" +"%H%M")" works perfectly.
>
> --
> Chris Elvidge
> England
>
>


You should be able to omit the printf and just do

date -d"$tim12" +"%H%M"

>