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Full Discussion: countdown to christmas
Top Forums Shell Programming and Scripting countdown to christmas Post 302310073 by jim mcnamara on Thursday 23rd of April 2009 04:08:13 PM
Old 04-23-2009
This script uses Julian Days. This is overkill if you have GNU date (Linux)
Code:
#!/bin/ksh

jd=0
fraction=0

JD() # $1==day $2=month $3=year
{
   
    day=$1
    month=$2
    year=$3
	jd=0
	if [[ $month -lt 3 ]] ; then
	   year=$(( $year - 1 ))
	   month=$(( $month + 12 ))
	fi
	a=$(( $year / 100 ))
	b=$(( $a / 4 ))
	c=$(( 2 - $a + $b ))
	e=$(echo "365.25 * ( 4716 + $year ) " | bc -l)
    f=$(echo "30.6001 * ( $month + 1)" | bc -l )
    if [[ $year -gt 1581 ]] ; then
        jd=$(( $c + $day + $e + $f ))
    	jd=$( echo "$jd  - 1524.5" | bc -l )
    fi
    export jd
}


hr=$(( $(date "+%H") * 3600 ))
min=$(( $(date "+%M") *60   ))
sec=$(date "+%S")
fraction=$( echo "$hr/86400 + $min/86400  + $sec/86400"| bc -l)

JD $( date "+%d %m %Y" )
today=$( echo "$jd + $fraction" | bc -l)

yr=$( date "+%Y" )
JD 25 12 $yr
xmas=$jd    
difference=$(( $xmas - $today ))

if [[ $difference -lt 0 ]] ; then 
	yr=$(( $yr + 1 ))
	JD 25 12 $yr
	xmas=$jd
    difference=$(( $xmas - $today ))
fi
echo "Days to Christmas: $difference"

 

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DATETIME.SETDATE(3)							 1						       DATETIME.SETDATE(3)

DateTime::setDate - Sets the date

       Object oriented style

SYNOPSIS
public DateTime DateTime::setDate (int $year, int $month, int $day) DESCRIPTION
Procedural style DateTime date_date_set (DateTime $object, int $year, int $month, int $day) Resets the current date of the DateTime object to a different date. PARAMETERS
o $object -Procedural style only: A DateTime object returned by date_create(3). The function modifies this object. o $year - Year of the date. o $month - Month of the date. o $day - Day of the date. RETURN VALUES
Returns the DateTime object for method chaining or FALSE on failure. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.3.0 | | | | | | | Changed the return value on success from NULL to | | | DateTime. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 DateTime.setDate(3) example Object oriented style <?php $date = new DateTime(); $date->setDate(2001, 2, 3); echo $date->format('Y-m-d'); ?> Procedural style <?php $date = date_create(); date_date_set($date, 2001, 2, 3); echo date_format($date, 'Y-m-d'); ?> The above examples will output: 2001-02-03 Example #2 Values exceeding ranges are added to their parent values <?php $date = new DateTime(); $date->setDate(2001, 2, 28); echo $date->format('Y-m-d') . " "; $date->setDate(2001, 2, 29); echo $date->format('Y-m-d') . " "; $date->setDate(2001, 14, 3); echo $date->format('Y-m-d') . " "; ?> The above example will output: 2001-02-28 2001-03-01 2002-02-03 SEE ALSO
DateTime.setISODate(3), DateTime.setTime(3). PHP Documentation Group DATETIME.SETDATE(3)
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