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given a date,find the next date

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# 1  
Old 12-06-2006
given a date,find the next date
Hi,
There are already some scripts posted in this forum reg date manipulations.This one is a addition to that.Go thro this script..
I didn't do any error checking (assuming that could be done in ano script)

# **** Finding date for a day after ****
#Add 1 to month, set date to 1 for the foll:
#if the date is 31
#if the date is 30, if the months are Apr, July, Sep or Nov
#if the date is 29, month is feb
#if the date is 29, month is feb and the year is leap year
#After addition, if the month is 13
#add 1 to year, set month to 1

#supply your date here
echo "28 02 4000"|
{
read DATE MONTH YEAR
incrementdate()
{
DATE=01
MONTH=`expr $MONTH + 1`
}
#check for date
case $DATE in
31)
incrementdate
;;
30)
if [ $MONTH -eq '04' -o $MONTH -eq '06' -o $MONTH -eq '09' -o $MONTH -eq '11' ]
then
incrementdate
fi
;;
29)
if [ $MONTH -eq '02' ]
then
incrementdate
fi
;;
28)
leapyr=`expr $YEAR % 4`
if [ $MONTH -eq '02' -a $leapyr -eq '0' ]
then
incrementdate
fi
;;
*)
DATE=`expr $DATE + 1`
;;
esac

#check for month
case $MONTH in
13)
#due to the above additions
MONTH=1
YEAR=`expr $YEAR + 1`
;;
esac

echo $DATE $MONTH $YEAR
}


# 2  
Old 12-06-2006
leapyr=`expr $YEAR % 4`

That will result in a leap year 100 times every 400 years which was correct for the Julian calendar. We now use the Gregorian calendar which has 97 leap years every 400 years. But don't take my word for it. Here is a link to Pope Gregory's bull, Inter Gravissimas.
# 3  
Old 12-07-2006
By default, in our calendar ..
By default, in our calendar every 4 years leap year ll occur. Right!
# 4  
Old 12-07-2006
Quote:
Originally Posted by sakthi.abdullah
By default, in our calendar every 4 years leap year ll occur. Right!
You are partially right because you said 4 years. But not every 4 years.

Years ending in 00 like 1700, 1800 are not leap years unless the year is also divisble by 400; i.e. 2000 was a leap year. 2100 will not be a leap year.

See what wikipedia has to say on leap years - http://en.wikipedia.org/wiki/Leap_year
# 5  
Old 12-07-2006
yes.. working on modifications
# 6  
Old 12-07-2006
This is a very common mistake. It is amazing how lucky we were that the year 2000 happened to be a leap year. 1900 and 2100 are far enough away from the current date that we often get away with it. It will be interesting to see how much stuff breaks in the year 2100. Smilie
# 7  
Old 11-11-2008
this will also fail at 28 th of any month
this will also fail at 28 th of any month
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