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ECMAScript spec abstract operations.
github.com/ljharb/es-abstract
ljharb/es-abstract
es-abstract
/
2021
/
DayFromYear.js
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(6 loc)
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JavaScript
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'use strict'
;
var
floor =
require
(
'./floor'
);
// https://262.ecma-international.org/5.1/#sec-15.9.1.3
module
.
exports
=
function
DayFromYear
(
y
) {
return
(
365
* (y -
1970
)) +
floor
((y -
1969
) /
4
) -
floor
((y -
1901
) /
100
) +
floor
((y -
1601
) /
400
); };