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Full Discussion: Calculating the day of the week
Top Forums UNIX for Dummies Questions & Answers Calculating the day of the week Post 8607 by Perderabo on Monday 15th of October 2001 10:43:41 AM
Old 10-15-2001
Here is a ksh script:
Code:
#! /usr/bin/ksh

#              ja fe ma ap ma ju ju ag se oc no de
set -A lasts 0 31 28 31 30 31 30 31 31 30 31 30 31


year=$1
month=$2
day=$3

#
# Get Day of Week of Jan 1
dow1=$(cal 1 $year | sed -n '3s/. //gp')
((dow1=7-dow1))

#
#  is this a leap year?
leap=0
if ((!(year%100))); then
     ((!(year%400))) && leap=1
else
     ((!(year%4))) && leap=1
fi

#
#  set number of days in february
lasts[2]=28
((leap)) && lasts[2]=29

#
#  calculate day of year
i=0
previous=0
while ((i < month)) ; do
     ((previous=previous+lasts[i]))
     ((i=i+1))
done
((doy=previous+day))

#
#  Calculate day of week
((dow = (doy+dow1-1)%7 ))

echo dow = $dow

exit 0

 

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LEARN ABOUT SUNOS

cal

cal(1)								   User Commands							    cal(1)

NAME

       cal - display a calendar

SYNOPSIS

       cal [ [month] year]

DESCRIPTION

       The  cal  utility writes a Gregorian calendar to standard output. If the year operand is specified, a calendar for that year is written. If
       no operands are specified, a calendar for the current month is written.

OPERANDS

       The following operands are supported:

       month	Specify the month to be displayed, represented as a decimal integer from 1 (January) to 12 (December). The default is the  current
		month.

       year	Specify  the year for which the calendar is displayed, represented as a decimal integer from 1 to 9999. The default is the current
		year.

ENVIRONMENT VARIABLES

       See  environ(5) for descriptions of the following environment variables that affect the execution of cal: LANG, LC_ALL, LC_CTYPE,  LC_TIME,
       LC_MESSAGES, and NLSPATH.

       TZ	Determine the timezone used to calculate the value of the current month.

EXIT STATUS

       The following exit values are returned:

       0	Successful completion.

       >0	An error occurred.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWesu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       calendar(1), attributes(5), environ(5), standards(5)

NOTES

       An  unusual calendar is printed for September 1752. That is the month 11 days were skipped to make up for lack of leap year adjustments. To
       see this calendar, type:

       cal 9 1752

       The command cal 83 refers to the year 83, not 1983.

       The year is always considered to start in January.

SunOS 5.10							    1 Feb 1995								    cal(1)
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