package foundation.util;
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import java.text.SimpleDateFormat;
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import java.util.Calendar;
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import java.util.Date;
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public class DateTimeUtil {
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private static String DATEFORMAT_YYYYMMDD = "yyyy-MM-dd";
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// 获取指定天数后的日期
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public static String addDays(String dateStr, int days) throws Exception {
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SimpleDateFormat sdf = new SimpleDateFormat(DATEFORMAT_YYYYMMDD);
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Calendar calendar = Calendar.getInstance();
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Date date = sdf.parse(dateStr);
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calendar.setTime(date);
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calendar.add(Calendar.DAY_OF_MONTH, days);
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return sdf.format(calendar.getTime());
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}
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// 获取指定月份数后的日期
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public static String addMonths(String dateStr, int months) throws Exception {
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SimpleDateFormat sdf = new SimpleDateFormat(DATEFORMAT_YYYYMMDD);
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Calendar calendar = Calendar.getInstance();
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Date date = sdf.parse(dateStr);
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calendar.setTime(date);
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calendar.add(Calendar.MONTH, months);
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return sdf.format(calendar.getTime());
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}
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// 获取指定年份数后的日期
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public static String addYears(String dateStr, int years) throws Exception {
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SimpleDateFormat sdf = new SimpleDateFormat(DATEFORMAT_YYYYMMDD);
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Calendar calendar = Calendar.getInstance();
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Date date = sdf.parse(dateStr);
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calendar.setTime(date);
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calendar.add(Calendar.YEAR, years);
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return sdf.format(calendar.getTime());
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}
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// 获取指定日期的季节
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public static String getSeason(String dateStr) throws Exception {
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SimpleDateFormat sdf = new SimpleDateFormat(DATEFORMAT_YYYYMMDD);
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Calendar calendar = Calendar.getInstance();
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Date date = sdf.parse(dateStr);
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calendar.setTime(date);
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int season = calendar.get(Calendar.MONTH)/3 + 1;
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return String.valueOf(season);
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}
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// 获取指定日期的季节
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public static String getSeason(Date date) throws Exception {
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Calendar calendar = Calendar.getInstance();
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calendar.setTime(date);
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int season = calendar.get(Calendar.MONTH)/3 + 1;
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return String.valueOf(season);
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}
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// 获取指定日期的月份
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public static String getMonth(String dateStr, boolean withZero) throws Exception {
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SimpleDateFormat sdf = new SimpleDateFormat(DATEFORMAT_YYYYMMDD);
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Calendar calendar = Calendar.getInstance();
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Date date = sdf.parse(dateStr);
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calendar.setTime(date);
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int month = calendar.get(Calendar.MONTH) + 1;
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if(!withZero) {
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return String.valueOf(month);
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}
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if(month < 10) {
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return "0" + month;
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}
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return String.valueOf(month);
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}
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public static String getMonth(Date date, boolean withZero) throws Exception {
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Calendar calendar = Calendar.getInstance();
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calendar.setTime(date);
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int month = calendar.get(Calendar.MONTH) + 1;
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if(!withZero) {
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return String.valueOf(month);
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}
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if(month < 10) {
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return "0" + month;
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}
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return String.valueOf(month);
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}
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// 获取指定日期的年份
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public static String getYear(String dateStr) throws Exception {
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SimpleDateFormat sdf = new SimpleDateFormat(DATEFORMAT_YYYYMMDD);
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Calendar calendar = Calendar.getInstance();
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Date date = sdf.parse(dateStr);
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calendar.setTime(date);
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int year = calendar.get(Calendar.YEAR);
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return String.valueOf(year);
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}
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// 获取指定日期的年份
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public static String getYear(Date date) throws Exception {
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Calendar calendar = Calendar.getInstance();
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calendar.setTime(date);
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int year = calendar.get(Calendar.YEAR);
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return String.valueOf(year);
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}
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// 获取两个日期之间相隔月份
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@SuppressWarnings("deprecation")
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public static int getIntervalMonth(Date startDate, Date endDate) throws Exception {
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if (startDate == null) {
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startDate = new Date();
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}
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if (endDate == null) {
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endDate = new Date();
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}
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return (endDate.getYear() - startDate.getYear()) * 12 + endDate.getMonth() - startDate.getMonth();
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}
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public static String addMonths(Date date, int months, String returnYM) {
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Calendar calendar = Calendar.getInstance();
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calendar.setTime(date);
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int month = calendar.get(Calendar.MONTH) + 1;
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month = month + months;
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int year = calendar.get(Calendar.YEAR);
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if(month > 12) {
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month = month/12;
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year = year + 1;
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}
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if (month < 10) {
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return year + "0" + month;
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}
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return year + month + "";
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}
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public static Date getMonthStartDate(String monthly) throws Exception {
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String date = monthly + "01";
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return Util.StringToDate(date);
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}
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public static Date getMonthEndDate(String monthly) throws Exception {
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String date = monthly + "01";
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Calendar calendar = Calendar.getInstance();
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calendar.setTime(Util.StringToDate(date));
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int month = calendar.get(Calendar.MONTH);
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calendar.set(Calendar.MONTH, month + 1);
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calendar.set(Calendar.DATE, 1);
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calendar.add(Calendar.DATE, -1);
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return calendar.getTime();
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}
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}
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