目录
public static int daysBetween(String smdate,String bdate) throws ParseException{ int daysInterval=0; if(StringUtils.isNoneBlank(smdate)&&StringUtils.isNoneBlank(bdate)){ SimpleDateFormat sdf=new SimpleDateFormat(\"yyyy-MM-dd\"); Calendar cal = Calendar.getInstance(); cal.setTime(sdf.parse(smdate)); long time1 = cal.getTimeInMillis(); cal.setTime(sdf.parse(bdate)); long time2 = cal.getTimeInMillis(); long between_days=(time2-time1)/(1000*3600*24); daysInterval = Integer.parseInt(String.valueOf(between_days)); } return daysInterval; }
java计算年月之间的加法和减法:
public static void main(String[] args) throws ParseException { SimpleDateFormat sdf = new SimpleDateFormat(\"yyyy-MM\"); String time=sdf.format(new Date()); Calendar cd = Calendar.getInstance(); cd.setTime(sdf.parse(time)); cd.add(Calendar.MONTH, 0);//往前一月,,如果是整数则进行加法,如果是负数,则进行减法 Date date=cd.getTime(); String endTimeString = sdf.format(date); cd.add(Calendar.MONTH, -7);//往后7个月 String startTimeString = sdf.format(cd.getTime()); String startTime = startTimeString.replaceAll(\"-\", \"\");//格式日期yyyyMM String endTime = endTimeString.replaceAll(\"-\", \"\");//格式日期yyyyMM System.out.println(startTime); System.out.println(endTime); }
获取一个月中的第一天和最后一天:
public static void main(String[] args) { // 获取当前年份、月份、日期 Calendar cale = null; cale = Calendar.getInstance(); // 获取当月第一天和最后一天 SimpleDateFormat format = new SimpleDateFormat(\"yyyy-MM-dd\"); // 获取前月的第一天 cale = Calendar.getInstance(); cale.add(Calendar.MONTH, -6); cale.set(Calendar.DAY_OF_MONTH, 1); String startTimeString = format.format(cale.getTime()); // 获取前月的最后一天 cale = Calendar.getInstance(); cale.add(Calendar.MONTH, 0); cale.set(Calendar.DAY_OF_MONTH, 0); String endTimeString = format.format(cale.getTime()); String startTime =startTimeString.replaceAll(\"-\", \"\");//格式日期yyyyMMdd String endTime =endTimeString.replaceAll(\"-\", \"\");//格式日期yyyyMMdd String layerTime = startTimeString +\"至\"+endTimeString; System.out.println(layerTime); }
计算两个月份之间相差的月份个数:
public int getMonthInterval(String str1,String str2) throws ParseException{ int monthLength = 0; if(StringUtils.isNoneBlank(str1)&& StringUtils.isNoneBlank(str2)){ SimpleDateFormat sdf = new SimpleDateFormat(\"yyyy-MM\"); Calendar bef = Calendar.getInstance(); Calendar aft = Calendar.getInstance(); bef.setTime(sdf.parse(str1)); aft.setTime(sdf.parse(str2)); int result = aft.get(Calendar.MONTH) - bef.get(Calendar.MONTH); int month = (aft.get(Calendar.YEAR) - bef.get(Calendar.YEAR)) * 12; monthLength = Math.abs(month + result); } return monthLength; }
java对当前月份进行传值计算:
public static Map<String,Object> getMonth(int length) throws ParseException{ Map<String, Object> map = new HashMap<>(); SimpleDateFormat sdf = new SimpleDateFormat(\"yyyy-MM\"); String time=sdf.format(new Date()); Calendar cd = Calendar.getInstance(); cd.setTime(sdf.parse(time)); cd.add(Calendar.MONTH, -length);//往前一月 Date date=cd.getTime(); String monthFormat= sdf.format(date); // System.out.println(monthFormat); String monthString =monthFormat.replaceAll(\"-\", \"\");//格式日期yyyyMM map.put(\"monthFormat\", monthFormat); map.put(\"monthString\", monthString); return map; }
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