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# 8  
Old 02-15-2011
OMG ....
i was not aware of this %100 and %400 tricky subtility in the "leap year" definition ...
Thx for clarification !

Code:
chk_leap(){
[[ $(($1%400)) -eq 0 ]] || [[ $(($1%100)) -ne 0 ]] && [[  $(($1%4)) -eq 0 ]] && echo "$1 IS a leap year" || echo "$1 is  NOT leap year"
}
chk_leap "$1"

Smilie
Last edited by ctsgnb; 02-15-2011 at 01:29 PM..
# 9  
Old 02-15-2011
Remember also that as you go backwards, there are missing days when calendars were 'corrected'.

From "The Mystery of the Missing Days" on www.genealogytoday.com
Quote:
On September 2, 1752, an odd happening occurred that's still keeping genealogists on their toes. On that day, the British Isles and all the English colonies, including America, lost 11 days--September 3 through 13. People went to sleep and when they awoke the next morning, the date had changed to September 14. There were riots in rural villages since the people thought the government was trying to cheat them out of 11 days of their lives. Though these days disappeared in English lands in 1752, a number had already vanished in other places--France in 1582, Austria in 1584, and Norway in 1700.
Personally I can't even remember when I was a lad, but I suppose there may be a need to go back this far and it has been coded by someone.
Code:
RBATTE1 @ /usr/home/RBATTE1>cal 1752

                                1752

          January                     February         
Sun Mon Tue Wed Thu Fri Sat  Sun Mon Tue Wed Thu Fri Sat  
             1   2   3   4                            1
 5   6   7   8   9  10  11    2   3   4   5   6   7   8
12  13  14  15  16  17  18    9  10  11  12  13  14  15
19  20  21  22  23  24  25   16  17  18  19  20  21  22
26  27  28  29  30  31       23  24  25  26  27  28  29

           March                        April          
Sun Mon Tue Wed Thu Fri Sat  Sun Mon Tue Wed Thu Fri Sat  
 1   2   3   4   5   6   7                1   2   3   4
 8   9  10  11  12  13  14    5   6   7   8   9  10  11
15  16  17  18  19  20  21   12  13  14  15  16  17  18
22  23  24  25  26  27  28   19  20  21  22  23  24  25
29  30  31                   26  27  28  29  30

            May                         June           
Sun Mon Tue Wed Thu Fri Sat  Sun Mon Tue Wed Thu Fri Sat  
                     1   2        1   2   3   4   5   6
 3   4   5   6   7   8   9    7   8   9  10  11  12  13
10  11  12  13  14  15  16   14  15  16  17  18  19  20
17  18  19  20  21  22  23   21  22  23  24  25  26  27
24  25  26  27  28  29  30   28  29  30
31
           July                        August          
Sun Mon Tue Wed Thu Fri Sat  Sun Mon Tue Wed Thu Fri Sat  
             1   2   3   4                            1
 5   6   7   8   9  10  11    2   3   4   5   6   7   8
12  13  14  15  16  17  18    9  10  11  12  13  14  15
19  20  21  22  23  24  25   16  17  18  19  20  21  22
26  27  28  29  30  31       23  24  25  26  27  28  29
                             30  31
         September                     October         
Sun Mon Tue Wed Thu Fri Sat  Sun Mon Tue Wed Thu Fri Sat  
         1   2  14  15  16    1   2   3   4   5   6   7
17  18  19  20  21  22  23    8   9  10  11  12  13  14
24  25  26  27  28  29  30   15  16  17  18  19  20  21
                             22  23  24  25  26  27  28
                             29  30  31

         November                     December         
Sun Mon Tue Wed Thu Fri Sat  Sun Mon Tue Wed Thu Fri Sat  
             1   2   3   4                        1   2
 5   6   7   8   9  10  11    3   4   5   6   7   8   9
12  13  14  15  16  17  18   10  11  12  13  14  15  16
19  20  21  22  23  24  25   17  18  19  20  21  22  23
26  27  28  29  30           24  25  26  27  28  29  30
                             31

RBATTE1 @ /usr/home/RBATTE1>

Do I get a saddo badge for this? Smilie

Anyway, I suppose one should ask why you want to get this far through the calendars and see if we can help address that issue.



Robin
Liverpool/Blackburn
UK
# 10  
Old 02-15-2011
Yep, those days are missing because of the correction that was required when switching from the Julian calendar to the Gregorian.

On a side note: today (Feb 15) 30 years ago the British switched to base 10 in their currency. IMO there's a pattern here when it comes to the Empire and international standards Smilie
# 11  
Old 02-15-2011
I think you will find it was forty years ago, i.e. 1971 and before I was born Smilie it must have been lost in translation somewhere, like the letter u in the correct spelling of colour. Smilie


Robin
# 12  
Old 02-15-2011
Quote:
Originally Posted by rbatte1
I think you will find it was forty years ago, i.e. 1971 and before I was born Smilie it must have been lost in translation somewhere, like the letter u in the correct spelling of colour. Smilie


Robin
You have a strange sense of humor Smilie

But it was 40 years, just after I was born. I'm glad they changed it. I couldn't make head nor tail of it before!
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