java计算两个年月日之间相差的天数:
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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:
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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:
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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:
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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:
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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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原文链接:https://blog.51cto.com/u_15535797/6081698