This adds moment to perfect date/time sorting with tabulator!

js/moment/src/lib/units/quarter.js

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+import { addFormatToken } from '../format/format';
+import { addUnitAlias } from './aliases';
+import { addUnitPriority } from './priorities';
+import { addRegexToken, match1 } from '../parse/regex';
+import { addParseToken } from '../parse/token';
+import { MONTH } from './constants';
+import toInt from '../utils/to-int';
+
+// FORMATTING
+
+addFormatToken('Q', 0, 'Qo', 'quarter');
+
+// ALIASES
+
+addUnitAlias('quarter', 'Q');
+
+// PRIORITY
+
+addUnitPriority('quarter', 7);
+
+// PARSING
+
+addRegexToken('Q', match1);
+addParseToken('Q', function (input, array) {
+    array[MONTH] = (toInt(input) - 1) * 3;
+});
+
+// MOMENTS
+
+export function getSetQuarter (input) {
+    return input == null ? Math.ceil((this.month() + 1) / 3) : this.month((input - 1) * 3 + this.month() % 3);
+}