Re: [Gnuplot-info] strptime() fails to recognize negative hours

[theozh <th...@gm...>]

a suggestion for a possible workaround (still to be optimized for all possible cases):

### handling negative times
$Data <<EOD
1   00:01:00
2  -00:01:00
EOD

myTimeFmt = "%tH:%tM:%tS"

myTimeSigned(fmt,s) = s[1:1] eq '-' && strptime("%tH",s)==0 && strptime(fmt,s)>0 ? \
                      -strptime(fmt,s[2:]) : strptime(fmt,s)

myTime(n,fmt) = myTimeSigned(fmt,strcol(n))

set table $Test
    plot $Data u 1:(myTime(2,myTimeFmt)) w table
unset table
print $Test
### end of code

Result:
1   60
2  -60

see more details:     https://stackoverflow.com/a/61005915/7295599

Theo.