> On Sun, Oct 14, 2018 at 8:19 PM Michael Van Canneyt > <mich...@freepascal.org> wrote: >> >> >> >> On Mon, 15 Oct 2018, Sven Barth via fpc-pascal wrote: >> >> > Marcos Douglas B. Santos <m...@delfire.net> schrieb am So., 14. Okt. >> 2018, >> > 16:15: >> > >> >> Do you know any Pascal lib to parse strings to convert in date/time >> values? >> >> The user is supposed to type human-friendly values like: >> >> - "day" => trunc(now) >> >> - "day-2" => trunc(now-2) >> >> - "week" => trunc(now-7) >> >> - "yesterday" => trunc(now-1) >> >> - etc... >> >> But they could type even their computer date format or ISO as well. >> >> >> >> A lib in C, but very complex: >> >> - https://github.com/gagern/gnulib/blob/master/lib/parse-datetime.y >> >> >> >> I would like to start with something simpler, if possible. Thank you. >> >> >> > >> > I don't know a specific library that fulfills your needs, but maybe >> you can >> > build something atop of FpExprPars: >> > http://wiki.lazarus.freepascal.org/How_To_Use_TFPExpressionParser >> > At least according to the source it also supports datetime handling. > > Thanks, Sven. > >> >> It does, it's used (amongst other things) in the reporting engine; > > Michael, > But does it work using just date values - accordingly with date format > in OS - or also with "day", "tomorrow", etc? > If not, can I extend those classes without change the original ones?
All depends on the exact format you want to use. day -1 can be easily implemented by registering a function day, which returns teh same Date() double quotes are supported as delimiters for identifiers, so "Day" should work, but a date literal is going to be tricky. Michael. _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal