Here you can find the source of normalizeMonth(final int month)
public static int normalizeMonth(final int month)
//package com.java2s; /**/*from w w w. ja v a 2s . c o m*/ * Copyright (C) 2015+ furplag (https://github.com/furplag/) * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ public class Main { public static int normalizeMonth(final int month) { if (1 <= month && month <= 12) return month; int modulo = month % 12; if (modulo < 0) return 12 + modulo; return modulo == 0 ? 12 : modulo; } }