Created
December 7, 2012 19:35
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Days in a month
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| monthLength = 31; | |
| if (monthNum==3 || monthNum==5 || monthNum==8 || monthNum==10) { | |
| monthLength = 30; | |
| } else if (monthNum==1) { | |
| if (year % 4 == 0 ) { | |
| if (year % 100 == 0) { | |
| if (year % 400 == 0) { | |
| monthLength = 29; | |
| } else { | |
| monthLength = 28; } | |
| } else { | |
| monthLength = 29; } | |
| } else { | |
| monthLength = 28;} | |
| } |
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The code first sets the numbers of days in a month to 31. Then it sets April, June, September, and November to 30 days, and then it checks February.
If the year is divisible by 4, e.g. it has a remainder of zero when divided by 4 (year % 4 == 0), and it is divisible by 100, and it is divisible by 400, then there are 29 days. If meets those first two criteria, that is is divisible by 4 and by 100, but not divisible by 400, then there are only 28 days, and if it is divisible by 4, but not by 100, then there are 29 days.