Time Calculation in LaTex
Chitarup
is there a possibility to calculate time in LaTex. Let's say I define
a start time, add some minutes to it and use the current value in the
document. Something like:
\def\startTime{9:00}
\add\startTime{0:30}
\startTime % output 9:30
A solution of this would be very helpful.
Thanks,
Chitarup
Nicola Talbot
> is there a possibility to calculate time in LaTex. Let's say I define
> a start time, add some minutes to it and use the current value in the
> document.
Hi,
It's possible there's a neater way of doing this using the calc
package, but try the following
\documentclass{article}
\begin{document}
\newcount\hours
\newcount\minutes
\def\gettime#1:#2\relax#3#4{\def#3{#1}\def#4{#2}}
\newcommand{\add}[2]{\expandafter\gettime#1\relax{\hrs}{\mins}
\expandafter\gettime#2\relax{\addhrs}{\addmins}%
\hours=\hrs\relax
\advance\hours by \addhrs\relax
\minutes=\mins\relax
\advance\minutes by \addmins\relax
\ifnum\minutes>60\relax
\advance\minutes by -60\relax
\advance\hours by 1\relax
\else
\ifnum\minutes<0\relax
\advance\minutes by 60\relax
\advance\hours by -1\relax
\fi
\fi
\ifnum\hours>24\relax
\advance\hours by -24\relax
\else
\ifnum\hours<0\relax
\advance\hours by 24\relax
\fi
\fi
\ifnum\minutes<10\relax
\edef#1{\number\hours:0\number\minutes}%
\else
\edef#1{\number\hours:\number\minutes}%
\fi}
\def\startTime{9:00}
\add\startTime{0:30}
\startTime
\end{document}
Regards
Nicola Talbot
Chitarup
far out!!!! This is exactly what need.
Thank you very much.
Best whishes,
Chitarup
Nicola Talbot
> \ifnum\minutes>60\relax
Sorry, that should have been
\ifnum\minutes>59\relax
> \ifnum\hours>24\relax
Likewise, that should be
\ifnum\hours>23\relax
Regards
Nicola Talbot
Michele Dondi
Perhaps not exactly what you expected, but especially if you also need
to work with dates, then you may go with PerlTeX and one out of a
zillion date calculating modules, like DateTime, or Date::Calc.
Michele
--
>It's because the universe was programmed in C++.
No, no, it was programmed in Forth. See Genesis 1:12:
"And the earth brought Forth ..."
- Robert Israel in sci.math, thread "Why numbers?"
Chitarup
thanks for the correction. Unfortunately the code doesn't work within
a table:
\def\startTime{9:45}
\begin{tabular}{|p{1cm}|p{4cm}|}
\hline
Time &
Content\\
\hline
\hline
\add\startTime{0:05} \textbf{\startTime} & \quad \\
\hline
\add\startTime{0:05} \textbf{\startTime} & \quad \\
\hline
\add\startTime{0:05} \textbf{\startTime} & \quad \\
\hline
\end{tabular}
The output is always 9:50. Outside of an table it works fine. Any
ideas?
Regards,
Chitarup
Nicola Talbot
> thanks for the correction. Unfortunately the code doesn't work within
> a table:
try changing \edef to \xdef
Regards
Nicola Talbot
Chitarup
Hello Nicola,
yes, this is working.
Thanks,
Chitarup
Olaf Meltzer
> On Feb 4, 10:09 pm, Chitarup <chita...@googlemail.com> wrote:
>> thanks for the correction. Unfortunately the code doesn't work
>> within a table:
>
> try changing \edef to \xdef
Nicola,
I think one has to \xdef\startTime[] inside the tabular as outside.
Have a look on this example, which is correct:
\documentclass{article}
\newcount\hours
\newcount\minutes
\def\gettime#1:#2\relax#3#4{\def#3{#1}\def#4{#2}}
\newcommand{\add}[2]{\expandafter\gettime#1\relax{\hrs}{\mins}
\expandafter\gettime#2\relax{\addhrs}{\addmins}%
\hours=\hrs\relax
\advance\hours by \addhrs\relax
\minutes=\mins\relax
\advance\minutes by \addmins\relax
\ifnum\minutes>59\relax
\advance\minutes by -60\relax
\advance\hours by 1\relax
\else
\ifnum\minutes<0\relax
\advance\minutes by 60\relax
\advance\hours by -1\relax
\fi
\fi
\ifnum\hours>23\relax
\advance\hours by -24\relax
\else
\ifnum\hours<0\relax
\advance\hours by 24\relax
\fi
\fi
\ifnum\minutes<10\relax
\xdef#1{\number\hours:0\number\minutes}%
\else
\xdef#1{\number\hours:\number\minutes}%
\fi}
\begin{document}
Start 22:08\def\startTime{22:08},
duration 5:53\add\startTime{05:53},
ETA (should be 4:01) calculated \startTime
\begin{table}
\centering
\begin{tabular}{rrrr}
Start 23:01 \xdef\startTime{23:01}
&duration 01:01 \add\startTime{01:01}
&ETA should be 0:02
&calculated \startTime\\
Start 02:55 \xdef\startTime{02:55}
&duration 23:05 \add\startTime{23:05}
&ETA should be 2:00
&calculated \startTime\\
\end{tabular}
\caption{Timetable}
\end{table}
\end{document}
Sincerely -- Olaf Meltzer
Olaf Meltzer
> On Feb 4, 10:09 pm, Chitarup <chita...@googlemail.com> wrote:
>> thanks for the correction. Unfortunately the code doesn't work
>> within a table:
>
> try changing \edef to \xdef
Nicola,
I think one has to \xdef\startTime{} even inside the tabular.
Have a look on this example, which is correct:
\documentclass{article}
\newcount\hours
\newcount\minutes
\def\gettime#1:#2\relax#3#4{\def#3{#1}\def#4{#2}}
\newcommand{\add}[2]{\expandafter\gettime#1\relax{\hrs}{\mins}
\expandafter\gettime#2\relax{\addhrs}{\addmins}%
\hours=\hrs\relax
\advance\hours by \addhrs\relax
\minutes=\mins\relax
\advance\minutes by \addmins\relax
\ifnum\minutes>59\relax
\advance\minutes by -60\relax
\advance\hours by 1\relax
\else
\ifnum\minutes<0\relax
\advance\minutes by 60\relax
\advance\hours by -1\relax
\fi
\fi
\ifnum\hours>23\relax
\advance\hours by -24\relax
\else
\ifnum\hours<0\relax
\advance\hours by 24\relax
\fi
\fi
\ifnum\minutes<10\relax
\xdef#1{\number\hours:0\number\minutes}%
\else
\xdef#1{\number\hours:\number\minutes}%
\fi}
\begin{document}
Olaf Meltzer
> Nicola,
>
> I think one has to \xdef\startTime{} even inside the tabular.
> Have a look on this example, which is correct:
Another very small correction: First line of \newcommand{\add}...
should end with % to prevent a superfluous space wich otherwise would
prevent correct alignment.
As a result of further discussion in d.c.t.t one supposed to have a
solution to subtract times as well, and I modified your proposal in
accordance. Have a look on the combined add/subtract example.
%% LaTeX-Example: To add and subtract times
%%
%% Based on Nicola Talbots solution
%% of Chitarups problem from 2008-02-04 in ctt
%%
\documentclass{article}
\newcount\hours
\newcount\minutes
\def\gettime#1:#2\relax#3#4{\def#3{#1}\def#4{#2}}
\newcommand{\add}[2]{\expandafter\gettime#1\relax{\hrs}{\mins}%
\newcommand{\sub}[2]{\expandafter\gettime#1\relax{\hrs}{\mins}%
\expandafter\gettime#2\relax{\subhrs}{\submins}%
\hours=\hrs\relax
\advance\hours by -\subhrs\relax
\minutes=\mins\relax
\advance\minutes by -\submins\relax
\ifnum\minutes>59\relax
\advance\minutes by -60\relax
\advance\hours by 1\relax
\else
\ifnum\minutes<0\relax
\advance\minutes by 60\relax
\advance\hours by -1\relax
\fi
\fi
\ifnum\hours>23\relax
\advance\hours by -24\relax
\else
\ifnum\hours<0\relax
\advance\hours by 24\relax
\fi
\fi
\ifnum\minutes<10\relax
\xdef#1{\number\hours:0\number\minutes}%
\else
\xdef#1{\number\hours:\number\minutes}%
\fi}
\begin{document}
\section{Calculation of estimated time of arrival (ETA)}
The estimated time of arrival (ETA) is calculated as estimated
time of takeoff (ETT) plus duration.
ETT 22:08\def\startTime{22:08},
duration 5:53\add\startTime{05:53},
ETA (should be 4:01) calculated \startTime.
\section{Calculation of duration}
The duration is calculated as differenz between actual time of
arrival (ATA) and actual time of takoff (ATT).
ATT 20:05, ATA 0:15\def\startTime{00:15}, duration (should be
4:10)\sub\startTime{20:05}, calculated \startTime.
\begin{table}
\centering
\begin{tabular}{rrrr}
ETT&duration&correct&calculated\\
23:01\xdef\startTime{23:01}
&1:01\add\startTime{1:01}
&0:02
&\startTime\\
2:55\xdef\startTime{2:55}
&23:05\add\startTime{23:05}
&2:00
&\startTime\\
\end{tabular}
\caption{Calculated ETA (added times)}
\end{table}
\begin{table}
\centering
\begin{tabular}{rrrr}
ATA&ATT&correct&calculated\\
21:15\xdef\startTime{21:15}
&20:05\sub\startTime{20:05}
&1:10
&\startTime\\
0:15\xdef\startTime{0:15}
&20:05\sub\startTime{20:05}
&4:10
&\startTime\\
\end{tabular}
\caption{Calculated duration (subtracted times)}