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Full Discussion: get next working day
Top Forums Programming get next working day Post 302272673 by jim mcnamara on Wednesday 31st of December 2008 10:11:38 AM
Old 12-31-2008
fpmurphy gave you a very reasonable response based on your requirements.

I work in calendrics a lot, and the requirements you stated for the
definition of a "business day" were either very naive, or for a country
I have never done work for. In most places there are a lot of other
considerations as to what the definition of a "business day" is.

One reason is because the requirment doesn't take holidays and religious
observances into account. Holidays are never trivial, they are often
very local and often based on a distinctly non-Gregorian lunar
calculation. So there is no general method presented very often.

The other issue is that programmers think they "know" calendars
because they grew up with them, but may not know what calendars really do..
Even for the Gregorian calendar. Read the langinfo man page. Look at
the output of
Code:
 cal 9 1752

Do you know why September seems wrong?
And if you live in France that output of cal is wrong.

Holidays --
One way is parse a tztab-like file, then write code: maybe a "isholiday(struct
tm *)" function to parse the table the against a given date:

Quote:
# The first six fields specify the first minute in which a holiday
# specified in the seventh field, applies. The fields are
# separated by spaces or tabs. The first six are integer patterns that
# specify the minute (0-59), hour (0-23), day of the month (1-31), month
# of the year (1-12), year (1970-2038), and day of the week (0-6, with
# 0=Sunday). The minute, hour, and month of the year must contain a
# number in the (respective) range indicated above. The day of the
# month, year, and day of the week can contain a number as above or two
# numbers separated by a minus (indicating an inclusive range). Either
# the day of the month or the day of the week field must be a range, the
# other must be simple number.
#
#
# Holiday table - partial table example
MST7MDT
#minute
# hour
# DOM
# month
# year
# DOW
0 0 25 12 1990-2038 1-5 christmas
0 0 24 12 1990-2038 1-5 christmas eve
0 0 26 12 1990-2038 1 christmas on sunday
0 0 23 12 1990-2038 5 christmas eve on saturday
0 0 4 7 1990-2038 1-5 july 4
0 0 3 7 1990-2038 5 july 4 on saturday
0 0 5 7 1990-2038 1 july 4 on sunday
0 0 25-31 5 1990-2038 1 Memorial day always on the last monday of may
0 0 15-21 1 1990-2038 1 MLK day 3rd Monday in April
0 0 1-7 9 1990-2038 1 Labor day 1st Monday in Sept
0 0 E-2 0 0 0 Good Friday two days before easter
The E-2 entry is a paschal lunar easter algorithm for western Easter
(as opposed to Orthodox Easter) - the entry above returns two days
before Easter. Lunar holidays and very important religious observances
usually require special algorithms.

The table also deals with moving holidays onto work days, like observing
July 4th (a US holiday) on July 5 or on July 3 because July 4 is on a weekend.
 

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LEARN ABOUT MOJAVE

widget_calendar

widget_calendar(n)					    widget::calendar Megawidget 					widget_calendar(n)

__________________________________________________________________________________________________________________________________________________

NAME

       widget_calendar - widget::calendar Megawidget

SYNOPSIS

       package require Tcl  8.4

       package require Tk  8.4

       package require widget  ?3.0?

       widget::calendar pathname ?options?

_________________________________________________________________

DESCRIPTION

       This package provides a calendar megawidget (snidget).

       widget::calendar pathname ?options?

WIDGET OPTIONS

       -command
	      A script to evaluate when a date was selected.

       -dateformat
	      The format of the date that is returned. Default: %m/%d/%Y.

       -firstday
	      Set first day the week, Either sunday or monday. It defaults to monday.

       -font  Select the font used in the widget. It defaults to Helvetica 9.

       -highlightcolor
	      Selects the background color for the day that has been selected. Default: #FFCC00

       -language
	      Specify  language of the calendar contents. The language is specified by abbreviations of the languge, for example: en - english, de
	      - german ...  It defaults to en.

	      Supported languages: en, de, fr, it, es, pt, ru, sv, zh, fi

       -shadecolor
	      Selects the color of the parts that have a shaded background. Default: #888888

       -showpast
	      Specify if the past shall be shown. It is a boolean value and defaults to 1.

       -textvariable
	      Specifies the name of a variable whose value is linked to the entry widget's contents.  Whenever the  variable  changes  value,  the
	      widget's contents are updated, and vice versa.

WIDGET COMMAND

       pathname get ?what?

       Returns	a  part  of  the  selected date or 'all'. The argument what selects the part. Valid values for what are: day, month, year and all.
       'all' is the default and returns the complete date in the format given with -dateformat.

DEFAULT BINDINGS

       On creation of the calendar widget the following bindings are installed.

       o      Up - Move to week before current date

       o      Down - Move to week after current date

       o      Left - Move to day before current date

       o      Right - Move to day after current date

       o      Control-Left - Move to month before current date

       o      Control-Right - Move to month after current date

       o      Control-Up - Move to year before current date

       o      Control-Down - Move to year after current date

EXAMPLE

	   package require widget::calendar ; # or widget::all
	   set t [widget::calendar .t]
	   pack $t -fill x -expand 1

KEYWORDS

       megawidget, snit, widget

widget								       0.93							widget_calendar(n)
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