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| #!/bin/sh
# SAVE THIS CODE AS cala_day.sh
#
# Uses Zellers Congruence calculation to use a date and give
# the day of the week that date was.
#
# This function expects 3 Arguments,
# DAY MONTH YEAR
# then
# Returns a value between 0 and 6 to represent the day of the
# week where 0=Sun,1=Mon,...6=Sat
#
# e.g cala_day.sh 25 12 2005
#
# This formula is Year 2000 compliant.
# It is not compliant using dates previous to Oct 1752
#
# Adjust Month such that March becomes 1 month of
# year and Jan/Feb become 11/12 of previous year
# =============================================
if [ $MONTH -ge 3 ] ; then
MONTH=`expr $MONTH - 2`
else
MONTH=`expr $MONTH + 10`
fi
if [ $MONTH -eq 11 ] || [ $MONTH -eq 12 ] ; then
YEAR=`expr $YEAR - 1`
fi
# ==============================================
# Split YEAR into YEAR and CENTURY
# ================================
CENTURY=`expr $YEAR / 100`
YEAR=`expr $YEAR % 100`
# ================================
# Black Magic Time
# ================
# Z = (( 26*$MONTH - 2 ) / 10) + $DAY + $YEAR + ( $YEAR/4 ) + ( $CENTURY/4 ) - (
2 * $CENTURY) + 77) % 7
Z=`expr \( $MONTH \* 26 - 2 \) / 10`
Z=`expr $Z + $DAY + $YEAR`
Z=`expr $Z + $YEAR / 4`
Z=`expr $Z + $CENTURY / 4`
Z=`expr $Z - $CENTURY - $CENTURY + 77`
Z=`expr $Z % 7`
if [ $Z -lt 0 ] ; then
Z=`expr $Z + 7`
fi
# ================
echo $Z
# Sun 0
# Mon 1
# Tue 2
# Wed 3
# Thu 4
# Fri 5
# Sat 6
# ========================
} | |
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| | | | matthew waygood wrote : 1334
if [ $MONTH -ge 3 ] ; then
MONTH=`expr $MONTH - 2`
else
MONTH=`expr $MONTH + 10`
fi
if [ $MONTH -eq 11 ] || [ $MONTH -eq 12 ] ; then
YEAR=`expr $YEAR - 1`
fi
Can be re-written as:-
MONTH=`expr (($MONTH+9)%12)+1`;
| | | | matthew waygood wrote :1335
sorry not the year bit.
Very interesting bit of code, got me looking into Zeller a bit.
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