java日期工具类详解编程语言

public class DateUtils { 

 private static Log logger = LogFactory.getLog(DateUtils.class); 

 public static String getFirstDayOfMonth(int year, int month) { 

 Calendar cal = Calendar.getInstance(); 

 // 设置年份 

 cal.set(Calendar.YEAR, year); 

 // 设置月份 

 cal.set(Calendar.MONTH, month - 1); 

 // 设置日历中月份的第1天 

 cal.set(Calendar.DAY_OF_MONTH, 1); 

 // 格式化日期 

 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); 

 String firstDayOfMonth = sdf.format(cal.getTime()); 

 return firstDayOfMonth; 

 public static String getLastDayOfMonth(int year, int month) { 

 Calendar cal = Calendar.getInstance(); 

 // 设置年份 

 cal.set(Calendar.YEAR, year); 

 // 设置月份 

 cal.set(Calendar.MONTH, month); 

 // 设置日历中月份的最后1天 

 cal.set(Calendar.DATE, 0); 

 // 格式化日期 

 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); 

 String lastDayOfMonth = sdf.format(cal.getTime()); 

 return lastDayOfMonth; 

 public static String getFirstDayOfYear(int year) { 

 Calendar cal = Calendar.getInstance(); 

 // 设置年份 

 cal.set(Calendar.YEAR, year); 

 // 设置月份 

 cal.set(Calendar.MONTH, 0); 

 // 设置日历中月份的第1天 

 cal.set(Calendar.DAY_OF_MONTH, 1); 

 // 格式化日期 

 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); 

 String firstDayOfYear = sdf.format(cal.getTime()); 

 return firstDayOfYear; 

 public static String getLastDayOfYear(int year) { 

 Calendar cal = Calendar.getInstance(); 

 // 设置年份 

 cal.set(Calendar.YEAR, year); 

 // 设置月份 

 cal.set(Calendar.MONTH, 11); 

 // 设置日历中月份的最后1天 

 cal.set(Calendar.DATE, 0); 

 // 格式化日期 

 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); 

 String lastDayOfYear = sdf.format(cal.getTime()); 

 return lastDayOfYear; 

 /** 

 * 获取当前月第一天 

 * @return 

 public static String firstDayOfCurrentMonth(){ 

 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); 

 Calendar cal=Calendar.getInstance();//获取当前日期 

 cal.add(Calendar.MONTH, 0); 

 cal.set(Calendar.DAY_OF_MONTH,1);//设置为1号,当前日期既为本月第一天 

 return sdf.format(cal.getTime()); 

 /** 

 * 获取当前月最后一天 

 * @return 

 public static String lastDayOfCurrentMonth(){ 

 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); 

 Calendar cal = Calendar.getInstance();//获取当前日期 

 cal.set(Calendar.DAY_OF_MONTH, cal.getActualMaximum(Calendar.DAY_OF_MONTH)); 

 return sdf.format(cal.getTime()); 


 public static String compareDate(String firstDate, String lastDate) { 

 String retDate = null ; 

 if(StringUtils.isEmpty(firstDate) !StringUtils.isEmpty(lastDate)) { 

 return lastDate ; 

 if(!StringUtils.isEmpty(firstDate) StringUtils.isEmpty(lastDate)) { 

 return firstDate ; 

 if(!StringUtils.isEmpty(firstDate) !StringUtils.isEmpty(lastDate)) { 

 // 格式化日期 

 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 

 try { 

 Date first = sdf.parse(firstDate) ; 

 Date last = sdf.parse(lastDate) ; 

 if(first.after(last)) { 

 return sdf.format(first) ; 

 }else{ 

 return sdf.format(last) ; 

 } catch (ParseException e) { 

 logger.error("", e); 

 return retDate ; 

 public static Date getNextDay(Date date) { 

 Calendar calendar = Calendar.getInstance(); 

 calendar.setTime(date); 

 calendar.add(Calendar.DAY_OF_MONTH, +1);//+1今天的时间加一天 

 date = calendar.getTime(); 

 return date; 

 /** 

 * 获取日期的月份 

 * @param date 

 * @return 

 public static String getMonth(Date date){ 

 Calendar cal = Calendar.getInstance(); 

 cal.setTime(date); 

 int month = cal.get(Calendar.MONTH) + 1; 

 if(month 10){ 

 return "0"+month; 

 } else { 

 return String.valueOf(month); 

 /** 

 * 使用用户格式格式化日期 

 * @param date日期 

 * @param pattern日期格式 

 * @return 

 public static String format(Date date, String pattern) { 

 String returnValue = ""; 

 if (date != null) { 

 SimpleDateFormat df = new SimpleDateFormat(pattern); 

 returnValue = df.format(date); 

 return (returnValue); 

 /** 

 * 比较两个日期大小 

 * @param DATE1 

 * @param DATE2 

 * @param format 格式 yyyy-MM-dd,yyyy-MM-dd hh:mm:ss 

 * @return 

 public static int compareDate(String DATE1, String DATE2, String format) { 

 DateFormat df = new SimpleDateFormat(format); 

 try { 

 Date dt1 = df.parse(DATE1); 

 Date dt2 = df.parse(DATE2); 

 if (dt1.getTime() dt2.getTime()) { 

 return 1; 

 } else if (dt1.getTime() dt2.getTime()) { 

 return -1; 

 } else { 

 return 0; 

 } catch (Exception e) { 

 e.printStackTrace(); 

 return 0; 

 public static void main(String[] args) { 

 System.out.println(firstDayOfCurrentMonth()); 

 System.out.println(lastDayOfCurrentMonth()); 

 String camStartDate = "2016-11-11"; 

 String camEndDate = "2019-11-11"; 

 List String years = new ArrayList (); 

 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); 

 try { 

 Date d1 = sdf.parse(camStartDate); 

 Date d2 = sdf.parse(camEndDate); 

 Calendar c = Calendar.getInstance(); 

 c.setTime(d1); 

 int year1 = c.get(Calendar.YEAR); 

 c.setTime(d2); 

 int year2 = c.get(Calendar.YEAR); 

 do { 

 if(year1 = 2017){ 

 years.add(year1 + ""); 

 year1++; 

 } while (year2 = year1); 

 } catch (ParseException e) { 

 e.printStackTrace(); 

 System.out.println(years); 

 /** 

 * 传入月份，将period转换为MM的格式 

 * @param period 

 * @return 

 public static String getMonthTwoPlace(String period){ 

 if(period.length() == 2){ 

 return period; 

 if(period.length() == 1){ 

 return "0" + period; 

 return null; 

 /** 

 * 将日期字符串转化为Date类型 

 * @param dateStr 

 * @param pattern 

 * @return 

 public static Date StringToDate(String dateStr, String pattern) { 

 try { 

 DateFormat sdf = new SimpleDateFormat(pattern); 

 Date date = sdf.parse(dateStr); 

 return date; 

 } catch (Exception ex) { 

 return null; 

 /** 

 * 将日期转化为字符串类型 

 * @param dateStr 

 * @param pattern 

 * @return 

 public static String dateToString(Date date, String pattern) { 

 DateFormat sdf = new SimpleDateFormat(pattern); 

 String dateStr = sdf.format(date); 

 return dateStr; 

原创文章，作者：Maggie-Hunter，如若转载，请注明出处：https://blog.ytso.com/17058.html