Java获取本月第一天最后一天，上个月下个月、上月最后一天下月第一天

/**
* 获取当前时间
*
* @param args
*/
public static String getNowTime() {
Calendar cal = Calendar.getInstance();
SimpleDateFormat dft = new SimpleDateFormat("yyyyMMdd");
String lastMonth = dft.format(cal.getTime());
return lastMonth;
}
/**
* 判断当天是否为本月第一天
*
* @return
*/
public static boolean isFirstDayOfMonth() {
boolean flag = false;
Calendar calendar = Calendar.getInstance();
int today = calendar.get(calendar.DAY_OF_MONTH);
if (1 == today) {
flag = true;
}
return flag;
}
/**
* 获取当前月份最后一天
*
* @param date
* @return
* @throws ParseException
*/
public static String getMaxMonthDate() {
SimpleDateFormat dft = new SimpleDateFormat("yyyyMMdd");
Calendar calendar = Calendar.getInstance();
calendar.setTime(new Date());
// calendar.add(Calendar.MONTH, -1);
calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
return dft.format(calendar.getTime());
}
/**
*
* 描述:获取下一个月的第一天.
*
* @return
*/
public static String getPerFirstDayOfMonth() {
SimpleDateFormat dft = new SimpleDateFormat("yyyyMMdd");
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.MONTH, 1);
calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMinimum(Calendar.DAY_OF_MONTH));
return dft.format(calendar.getTime());
}
/**
*
* 描述:获取上个月的最后一天.
*
* @return
*/
public static String getLastMaxMonthDate() {
SimpleDateFormat dft = new SimpleDateFormat("yyyyMMdd");
Calendar calendar = Calendar.getInstance();
calendar.setTime(new Date());
calendar.add(Calendar.MONTH, -1);
calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
return dft.format(calendar.getTime());
}
/**
* 获取上一个月
*
* @return
*/
public static String getLastMonth() {
Calendar cal = Calendar.getInstance();
cal.add(cal.MONTH, -1);
SimpleDateFormat dft = new SimpleDateFormat("yyyyMM");
String lastMonth = dft.format(cal.getTime());
return lastMonth;
}
/**
*
* 描述:获取下一个月.
*
* @return
*/
public static String getPreMonth() {
Calendar cal = Calendar.getInstance();
cal.add(cal.MONTH, 1);
SimpleDateFormat dft = new SimpleDateFormat("yyyyMM");
String preMonth = dft.format(cal.getTime());
return preMonth;
}
// 是否是最后一天
public static boolean isLastDayOfMonth() {
boolean flag = false;
if (StringUtils.isNotBlank(getNowTime()) && StringUtils.isNotBlank(getMaxMonthDate()) && StringUtils.equals(getNowTime(), getMaxMonthDate())) { // getMaxMonthDate().equals(getNowTime())
flag = true;
}
return flag;
}
/**
* 获取任意时间的下一个月
* 描述:<描述函数实现的功能>.
* @param repeatDate
* @return
*/
public static String getPreMonth(String repeatDate) {
String lastMonth = "";
Calendar cal = Calendar.getInstance();
SimpleDateFormat dft = new SimpleDateFormat("yyyyMM");
int year = Integer.parseInt(repeatDate.substring(0, 4));
String monthsString = repeatDate.substring(4, 6);
int month;
if ("0".equals(monthsString.substring(0, 1))) {
month = Integer.parseInt(monthsString.substring(1, 2));
} else {
month = Integer.parseInt(monthsString.substring(0, 2));
}
cal.set(year,month,Calendar.DATE);
lastMonth = dft.format(cal.getTime());
return lastMonth;
}
/**
* 获取任意时间的上一个月
* 描述:<描述函数实现的功能>.
* @param repeatDate
* @return
*/
public static String getLastMonth(String repeatDate) {
String lastMonth = "";
Calendar cal = Calendar.getInstance();
SimpleDateFormat dft = new SimpleDateFormat("yyyyMM");
int year = Integer.parseInt(repeatDate.substring(0, 4));
String monthsString = repeatDate.substring(4, 6);
int month;
if ("0".equals(monthsString.substring(0, 1))) {
month = Integer.parseInt(monthsString.substring(1, 2));
} else {
month = Integer.parseInt(monthsString.substring(0, 2));
}
cal.set(year,month-2,Calendar.DATE);
lastMonth = dft.format(cal.getTime());
return lastMonth;
}
//
/**
* 获取任意时间的月的最后一天
* 描述:<描述函数实现的功能>.
* @param repeatDate
* @return
*/
private static String getMaxMonthDate(String repeatDate) {
SimpleDateFormat dft = new SimpleDateFormat("yyyyMMdd");
Calendar calendar = Calendar.getInstance();
try {
if(StringUtils.isNotBlank(repeatDate) && !"null".equals(repeatDate)){
calendar.setTime(dft.parse(repeatDate));
}
} catch (ParseException e) {
e.printStackTrace();
}
// calendar.add(Calendar.MONTH, -1);
calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
return dft.format(calendar.getTime());
}
/**
* 获取任意时间的月第一天
* 描述:<描述函数实现的功能>.
* @param repeatDate
* @return
*/
private static String getMinMonthDate(String repeatDate){
SimpleDateFormat dft = new SimpleDateFormat("yyyyMMdd");
Calendar calendar = Calendar.getInstance();
try {
if(StringUtils.isNotBlank(repeatDate) && !"null".equals(repeatDate)){
calendar.setTime(dft.parse(repeatDate));
}
} catch (ParseException e) {
e.printStackTrace();
}
// calendar.add(Calendar.MONTH, -1);
calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMinimum(Calendar.DAY_OF_MONTH));
return dft.format(calendar.getTime());
}
/**
* 不论是当前时间，还是历史时间皆是时间点的前天
* repeatDate 任意时间
*/
public static String getModify2DaysAgo(String repeatDate) {
Calendar cal = Calendar.getInstance();
String daysAgo = "";
SimpleDateFormat dft = new SimpleDateFormat("yyyyMMdd");
if (repeatDate == null || "".equals(repeatDate)) {
cal.set(Calendar.DATE, cal.get(Calendar.DATE) - 2);
} else {
int year = Integer.parseInt(repeatDate.substring(0, 4));
String monthsString = repeatDate.substring(4, 6);
int month;
if ("0".equals(monthsString.substring(0, 1))) {
month = Integer.parseInt(monthsString.substring(1, 2));
} else {
month = Integer.parseInt(monthsString.substring(0, 2));
}
String dateString = repeatDate.substring(6, 8);
int date;
if ("0".equals(dateString.subSequence(0, 1))) {
date = Integer.parseInt(dateString.substring(1, 2));
} else {
date = Integer.parseInt(dateString.substring(0, 2));
}
cal.set(year, month-1, date - 1);
System.out.println(dft.format(cal.getTime()));
}
daysAgo = dft.format(cal.getTime());
return daysAgo;
}
/**
* 不论是当前时间，还是历史时间皆是时间点的T-N天
* repeatDate 任意时间 param 数字可以表示前几天
*/
public static String getModifyNumDaysAgo(String repeatDate,int param) {
Calendar cal = Calendar.getInstance();
String daysAgo = "";
SimpleDateFormat dft = new SimpleDateFormat("yyyyMMdd");
if (repeatDate == null || "".equals(repeatDate)) {
cal.set(Calendar.DATE, cal.get(Calendar.DATE) - param);
} else {
int year = Integer.parseInt(repeatDate.substring(0, 4));
String monthsString = repeatDate.substring(4, 6);
int month;
if ("0".equals(monthsString.substring(0, 1))) {
month = Integer.parseInt(monthsString.substring(1, 2));
} else {
month = Integer.parseInt(monthsString.substring(0, 2));
}
String dateString = repeatDate.substring(6, 8);
int date;
if ("0".equals(dateString.subSequence(0, 1))) {
date = Integer.parseInt(dateString.substring(1, 2));
} else {
date = Integer.parseInt(dateString.substring(0, 2));
}
cal.set(year, month-1, date - param+1);
System.out.println(dft.format(cal.getTime()));
}
daysAgo = dft.format(cal.getTime());
return daysAgo;
}

Java获取本月第一天最后一天，上个月下个月、上月最后一天下月第一天

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