compare-dates - npm Package Compare versions

Comparing version 1.0.0 to 1.1.0

dist/compare.cjs.js

@@ -252,2 +252,61 @@ 'use strict';
 
+function diff(first, second, units, asFloat) {
+    let output;
+    if (!isValidDate(first) || !isValidDate(second)) {
+        throw new Error('Invalid date');
+    }
+
+    units = normalizeUnits(units);
+
+    if (units === 'year' || units === 'month' || units === 'quarter') {
+        output = monthDiff(first, second);
+        if (units === 'quarter') {
+            output = output / 3;
+        } else if (units === 'year') {
+            output = output / 12;
+        }
+    } else {
+        const delta = first - second;
+        output = units === 'second' ? delta / 1e3 : // 1000
+        units === 'minute' ? delta / 6e4 : // 1000 * 60
+        units === 'hour' ? delta / 36e5 : // 1000 * 60 * 60
+        units === 'day' ? delta / 864e5 : // 1000 * 60 * 60 * 24, negate dst
+        units === 'week' ? delta / 6048e5 : // 1000 * 60 * 60 * 24 * 7, negate dst
+        delta;
+    }
+    return asFloat ? output : absFloor(output);
+}
+
+function absFloor(number) {
+    if (number < 0) {
+        // -0 -> 0
+        return Math.ceil(number) || 0;
+    } else {
+        return Math.floor(number);
+    }
+}
+
+function monthDiff(a, b) {
+    // difference in months
+    var wholeMonthDiff = (b.getFullYear() - a.getFullYear()) * 12 + (b.getMonth() - a.getMonth()),
+
+    // b is in (anchor - 1 month, anchor + 1 month)
+    anchor = add(a, wholeMonthDiff, 'months'),
+        anchor2,
+        adjust;
+
+    if (b - anchor < 0) {
+        anchor2 = add(a, wholeMonthDiff - 1, 'months');
+        // linear across the month
+        adjust = (b - anchor) / (anchor - anchor2);
+    } else {
+        anchor2 = add(a, wholeMonthDiff + 1, 'months');
+        // linear across the month
+        adjust = (b - anchor) / (anchor2 - anchor);
+    }
+
+    //check for negative zero, return zero if negative zero
+    return -(wholeMonthDiff + adjust) || 0;
+}
+
 exports.min = min;
@@ -264,2 +323,3 @@ exports.max = max;
 exports.startOf = startOf;
-exports.endOf = endOf;
+exports.endOf = endOf;
+exports.diff = diff;

dist/compare.es6.js

@@ -248,2 +248,61 @@ function isValidDate (input) {
 
-export { min, max, isAfter, isBefore, isBetween, isSame, isSameOrAfter, isSameOrBefore, add, subtract, startOf, endOf };
+function diff(first, second, units, asFloat) {
+    let output;
+    if (!isValidDate(first) || !isValidDate(second)) {
+        throw new Error('Invalid date');
+    }
+
+    units = normalizeUnits(units);
+
+    if (units === 'year' || units === 'month' || units === 'quarter') {
+        output = monthDiff(first, second);
+        if (units === 'quarter') {
+            output = output / 3;
+        } else if (units === 'year') {
+            output = output / 12;
+        }
+    } else {
+        const delta = first - second;
+        output = units === 'second' ? delta / 1e3 : // 1000
+        units === 'minute' ? delta / 6e4 : // 1000 * 60
+        units === 'hour' ? delta / 36e5 : // 1000 * 60 * 60
+        units === 'day' ? delta / 864e5 : // 1000 * 60 * 60 * 24, negate dst
+        units === 'week' ? delta / 6048e5 : // 1000 * 60 * 60 * 24 * 7, negate dst
+        delta;
+    }
+    return asFloat ? output : absFloor(output);
+}
+
+function absFloor(number) {
+    if (number < 0) {
+        // -0 -> 0
+        return Math.ceil(number) || 0;
+    } else {
+        return Math.floor(number);
+    }
+}
+
+function monthDiff(a, b) {
+    // difference in months
+    var wholeMonthDiff = (b.getFullYear() - a.getFullYear()) * 12 + (b.getMonth() - a.getMonth()),
+
+    // b is in (anchor - 1 month, anchor + 1 month)
+    anchor = add(a, wholeMonthDiff, 'months'),
+        anchor2,
+        adjust;
+
+    if (b - anchor < 0) {
+        anchor2 = add(a, wholeMonthDiff - 1, 'months');
+        // linear across the month
+        adjust = (b - anchor) / (anchor - anchor2);
+    } else {
+        anchor2 = add(a, wholeMonthDiff + 1, 'months');
+        // linear across the month
+        adjust = (b - anchor) / (anchor2 - anchor);
+    }
+
+    //check for negative zero, return zero if negative zero
+    return -(wholeMonthDiff + adjust) || 0;
+}
+
+export { min, max, isAfter, isBefore, isBetween, isSame, isSameOrAfter, isSameOrBefore, add, subtract, startOf, endOf, diff };

package.json

@@ -5,3 +5,3 @@ {
   "repository": "https://github.com/guardian/compare-dates",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "license": "Apache-2.0",
@@ -8,0 +8,0 @@ "main": "dist/compare.cjs.js",

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Improved metrics

Total package byte prevSize

20233

increased by7.13%

Lines of code

544

increased by23.36%

Worsened metrics

Number of package files

4

decreased by-20%

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2

increased by100%

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0

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