Last Sunday of the Month

[Steve Buehler]

At 06:59 AM 4/5/2005, you wrote:
> > On Monday 04 April 2005 12:55 pm, Steve Buehler wrote:
> > > RHEL ES 3
> > > I can't seem to find this about the date command, but that doesn't
> > > mean it can't do it.  I have overlooked things in the past.
> > >
> > > 1.  Can the date command give you a date for the Last Sunday of a
> > > month?  Or do I have to go through a loop to check each day of the
> > > month to see if it is the last Sunday of the month?
> > >
> > > 2.  I can do a date --date="last sunday".  Is there a way
> > to tell it
> > > to give me the date of 4 Sundays ago?  I tried date
> > --date="4 sundays
> > > ago" and that didn't do it.
> >
> > You can use -d to request a date by string, but i think it
> > only uses 'next' or 'last'.
> > date -d "last month"
> > Fri Mar  4 21:00:09 PST 2005
> >
> > date -d "next sunday"
> > Sun Apr 10 00:00:00 PDT 2005
> >
> > You could check if next sunday is the current month:
> > date -d "next sunday"|awk ' {print $2} ...does it = $thismonth?
> > That would be a lot easier to check than checking every day.
> >
> > --
>
>Yes, check if next sunday is the current month but get the date like this:
>
>LASTSUNDAY=`date -d "last sunday"`
>NEXTSUNDAY=`date -d "next sunday"`
>NEXTSUNDAYMONTH=`date -d "$NEXTSUNDAY" | awk '{print $2}'`
>
>That will allow you to iterate in a while loop with the following (i.e. if
>NEXTSUNDAYMONTH is not equal to the current month):
>
>LASTSUNDAY=$NEXTSUNDAY
>NEXTSUNDAY=`date -d "$NEXTSUNDAY + 1 week"`      # I guess this line is what
>you're looking for
>NEXTSUNDAYMONTH=`date -d "$NEXTSUNDAY" | awk '{print $2}'`
>
>
>When NEXTSUNDAYMONTH is no longer equal to the current month, LASTSUNDAY
>will contain the date of the last Sunday of the current month.

Thanks To all who answered.  I came up with the following function since 
apparantly it can't be done with just the date command.:
NEXTMONTH=`/bin/date --date="next month" +%m`
g_1snm()
{
if [ $NEXTMONTH == `date --date="$1 sunday" +%m` ]
then
         a=`expr $1 - 1`
         LASTSUNDAYTHISMONTH=`date --date="$a sunday" +%Y%m%d`
else
         g_1snm `expr $1 + 1`
fi
}
g_1snm 1