Leap year calculation

leapyear() { [ $(date -d "Dec 31, $1" +%j) == 366 ] && echo leap || echo not leap; }

By: taliver

2010-03-30 20:13:56

date echo echo test

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Leap year calculation
This is sample output - yours may be different.
-1

year=2010; math=`echo "$year%4" | bc`; [ ! -z $year ] && [ $math -eq 0 ] && echo "$year is leap year!" || echo "$year isn't leap year";

mvrilo · 2010-03-30 15:33:00 4
Leap year calculation

Tested on bash, and follows all the rules about leap years. Show Sample Output
This is sample output - yours may be different.
```
$ leapyear 2000
2000 is a leap year!
$ leapyear 2400
2400 is a leap year!
$ leapyear 2600
2600 is not a leap year.
```
-2

leapyear() { if [ $[$1 % 4] -eq 0 ] && [ $[$1 % 100] -ne 0 ] || [ $[$1 % 400] -eq 0 ]; then echo $1' is a leap year!'; else echo $1' is not a leap year.'; fi; }

kaedenn · 2010-03-30 17:19:20 4

What Others Think

Very nice, although it's possible to run into the y2038 problem on 32bit systems.

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