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24 lines
696 B
Plaintext
24 lines
696 B
Plaintext
import addMonths from "./addMonths.mjs";
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function monthDiff(a, b) {
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const aTime = +a;
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const bTime = +b;
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if (aTime < bTime) {
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return -monthDiff(b, a);
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}
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const wholeMonthDiff = (b.getFullYear() - a.getFullYear()) * 12 + (b.getMonth() - a.getMonth());
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const anchor = +addMonths(new Date(aTime), wholeMonthDiff);
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let anchor2;
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let adjust;
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if (bTime < anchor) {
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anchor2 = +addMonths(new Date(aTime), wholeMonthDiff - 1);
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adjust = (bTime - anchor) / (anchor - anchor2);
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} else {
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anchor2 = +addMonths(new Date(aTime), wholeMonthDiff + 1);
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adjust = (bTime - anchor) / (anchor2 - anchor);
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}
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return -(wholeMonthDiff + adjust) || 0;
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}
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export {
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monthDiff as m
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};
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