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;
}
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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);
}
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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);
}
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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;
}
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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
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