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27 lines
808 B
27 lines
808 B
import interval from "./interval";
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var utcYear = interval(function(date) {
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date.setUTCMonth(0, 1);
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date.setUTCHours(0, 0, 0, 0);
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}, function(date, step) {
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date.setUTCFullYear(date.getUTCFullYear() + step);
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}, function(start, end) {
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return end.getUTCFullYear() - start.getUTCFullYear();
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}, function(date) {
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return date.getUTCFullYear();
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});
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// An optimized implementation for this simple case.
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utcYear.every = function(k) {
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return !isFinite(k = Math.floor(k)) || !(k > 0) ? null : interval(function(date) {
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date.setUTCFullYear(Math.floor(date.getUTCFullYear() / k) * k);
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date.setUTCMonth(0, 1);
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date.setUTCHours(0, 0, 0, 0);
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}, function(date, step) {
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date.setUTCFullYear(date.getUTCFullYear() + step * k);
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});
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};
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export default utcYear;
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export var utcYears = utcYear.range;
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