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Is it a leap year? What about in 1900? Get your leap year facts straight with this leap year calculator. Just enter the year you are interested in and the script reports whether it is a leap year or not. Or, enter a range of years and JavaScript will display all the leap years in that range.
Add the below code to the <body> section of your page:
<script
language="javascript"
type="text/javascript">
function
checkYear(year)
{
return
(((year
%
4
==
0)
&&
(year
%
100
!=
0))
||
(year
%
400
==
0))
?
1
:
0;
}
function
leap(form)
{
year
=
form.year.value;
var
Check1 =
parseFloat(year);
for
(var
i =
0;
i <
year.length;
i++)
{
var
sLetterCheck1 =
year.substring(i,
i+1);
if
(sLetterCheck1
<
"0"
||
sLetterCheck1 >
"9")
{
alert("Enter
a valid year.");
form.year.focus();
form.year.select();
return;
}
}
if
(year
<
1582)
{
form.result.value
=
"";
alert("Year
must be greater than 1581.");
form.year.focus();
form.year.select();
return;
}
checkYear(year);
if
(!checkYear(year))
form.result.value
=
"not a leap year.";
else
form.result.value
=
"a leap year.";
}
function
MakeArray(n)
{
if
(n
<=
0)
{
this.length
=
0;
return
this;
}
this.length
=
n;
for
(var
i =
1;
i <=
n;
i++)
{
this[i]
=
0;
}
return
this;
}
var
listArray =
new
MakeArray(160);
var
index
=
0;
function
list(form)
{
startyear
=
form.startyear.value;
endyear
=
form.endyear.value;
var
Check1 =
parseFloat(startyear);
var
Check2 =
parseFloat(endyear);
for
(var
i =
0;
i <
startyear.length;
i++)
{
var
sLetterCheck1 =
startyear.substring(i,
i+1);
if
(sLetterCheck1
<
"0"
||
sLetterCheck1 >
"9")
{
alert("Enter
a valid start year.");
form.startyear.focus();
form.startyear.select();
return;
}
}
for
(var
i =
0;
i <
endyear.length;
i++)
{
var
sLetterCheck2 =
endyear.substring(i,
i+1);
if
(sLetterCheck2
<
"0"
||
sLetterCheck2 >
"9")
{
alert("Enter
a valid end year.");
form.endyear.focus();
form.endyear.select();
return;
}
}
if
(startyear
<
1582)
{
form.yearlist.value
=
"";
alert("Start
year must be greater than 1581.");
form.startyear.focus();
form.startyear.select();
return;
}
else
if
(endyear
<=
startyear)
{
form.yearlist.value
=
"";
alert("End
year must be greater than start year.");
form.endyear.focus();
form.endyear.select();
return;
}
else
{
index
=
0;
for
(var
i=startyear;
i <=endyear;
i++)
{
if
(checkYear(i))
{
listArray[index]
=
i;
index++;
}
}
}
var
allYears;
allYears
=
"";
for(
i =
0;
i <
index;
i++
)
{
allYears
+=
listArray[i]
+
"\r"
+
"\n";
form.yearlist.value
=
allYears;
}
}
</script>
<form>
Check For Leap Year:<br>
Year:
<input
type=text
name=year
size=4>
is <input
type=text
name=result
size=15>
<br>
<br>
<input
type=button
value="Check
Year"
onClick="leap(this.form);">
<br>
Leap Years Within A Range:<br>
Start Year:<input
type=text
name=startyear
size=4><br>
End year:
<input
type="text"
name="endyear"
size=4><br>
<br>
<input
type=button
name=listyears
value="List
Years"
onClick="list(this.form);">
<br>
<textarea
name=yearlist
rows=10
cols=11></textarea>
</form>
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