// 获取当前月的第一天
public static String getFirstDay(String format) {
Calendar calendar = Calendar.getInstance();
int month = calendar.get(Calendar.MONTH);
int year = calendar.get(Calendar.YEAR);
calendar.set(year, month, 1);
return DateUtil.getDateText(calendar.getTime(), format);
}
// 获取日期的前n个月的月份（闭区间）
public static List<String> getPreNMonths(String curMonth, Integer n) {
String[] curArr = curMonth.split("-");
Integer curY = Integer.parseInt(curArr[0]);
Integer curM = Integer.parseInt(curArr[1]);
Calendar curCalendar = Calendar.getInstance();
curCalendar.set(curY, curM - 1, 1, 0, 0);
Calendar tmpCalendar = Calendar.getInstance();
tmpCalendar.set(curY, curM - 1 - n, 1, 0, 0);
List<String> months = new ArrayList<String>();
while (tmpCalendar.getTimeInMillis() <= curCalendar.getTimeInMillis()) {
months.add(DateUtil.getDateText(tmpCalendar.getTime(), "yyyy-MM"));
tmpCalendar.add(Calendar.MONTH, 1);
}
return months;
}
public static List<String> getBetweenDateStr(String startTime, String endTime, String format) {
List<String> dateList = new ArrayList<String>();
try {
Long startM = DateUtil.COMMON.getTextDate(startTime).getTime();
Long endM = DateUtil.COMMON.getTextDate(endTime).getTime();
long result = (endM - startM) / (24 * 60 * 60 * 1000);
String[] startTimeStr = startTime.split("-");
Calendar startCalendar = Calendar.getInstance();
startCalendar.set(
Integer.parseInt(startTimeStr[0]),
Integer.parseInt(startTimeStr[1]) - 1,
Integer.parseInt(startTimeStr[2]));
startCalendar.add(Calendar.DATE, -1);
for (int i = 0; i <= result; i++) {
startCalendar.add(Calendar.DATE, 1);
dateList.add(DateUtil.getDateText(startCalendar.getTime(), format));
}
} catch (ParseException e) {
e.printStackTrace();
}
return dateList;
}
// 获取前x天的数据, x < 10;
public static String getPreXDay(int x, String format) {
Calendar calendar = Calendar.getInstance();
int month = calendar.get(Calendar.MONTH);
int year = calendar.get(Calendar.YEAR);
int date = calendar.get(Calendar.DATE);
if (date - x < 0) {
if (month - 1 < 0) {
calendar.add(Calendar.YEAR, -1);
calendar.set(Calendar.MONTH, 11);
calendar.set(Calendar.DATE, 31 - (x - date));
} else {
calendar.add(Calendar.MONTH, -1);
calendar.set(Calendar.DATE, calendar.getActualMaximum(Calendar.DATE)); // 设置本月最大日期
int maxDate = calendar.get(Calendar.DATE);
calendar.set(year, month - 1, maxDate - (x - date));
}
} else {
calendar.set(year, month, date - x);
}
return DateUtil.getDateText(calendar.getTime(), format);
}
// 获取当前明天的数据
public static String getNextDay(String format) {
Calendar calendar = Calendar.getInstance();
Calendar tmpCalendar = Calendar.getInstance();
tmpCalendar.set(Calendar.DATE, calendar.getActualMaximum(Calendar.DATE)); // 设置本月最大日期
int maxDate = tmpCalendar.get(Calendar.DATE);
int month = calendar.get(Calendar.MONTH);
int year = calendar.get(Calendar.YEAR);
int date = calendar.get(Calendar.DATE);
if (date + 1 > maxDate) {
if (month + 1 > 11) {
calendar.add(Calendar.YEAR, 1);
calendar.set(Calendar.MONTH, 0);
calendar.set(Calendar.DATE, 1);
} else {
calendar.set(year, month, date + 1);
}
} else {
calendar.set(year, month, date + 1);
}
return DateUtil.getDateText(calendar.getTime(), format);
}
// 获取开始月份和结束月份中间的所有月份，包括开始月份和结束月份
public static List<String> getBetweenMonths(String startMonth, String endMonth) {
String[] startArr = startMonth.split("-");
String[] endArr = endMonth.split("-");
Integer startY = Integer.parseInt(startArr[0]);
Integer startM = Integer.parseInt(startArr[1]);
Integer endY = Integer.parseInt(endArr[0]);
Integer endM = Integer.parseInt(endArr[1]);
Calendar startCalendar = Calendar.getInstance();
startCalendar.set(startY, startM - 1, 1, 0, 0);
Calendar endCalendar = Calendar.getInstance();
endCalendar.set(endY, endM - 1, 1, 0, 0);
List<String> months = new ArrayList<String>();
while (startCalendar.getTimeInMillis() <= endCalendar.getTimeInMillis()) {
months.add(DateUtil.getDateText(startCalendar.getTime(), "yyyy-MM"));
startCalendar.add(Calendar.MONTH, 1);
}
return months;
}
// 获取当前月的最后一天
public static String getLastDay(String format) {
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.DATE, calendar.getActualMaximum(Calendar.DATE)); // 设置本月最大日期
return DateUtil.getDateText(calendar.getTime(), format);
}
// 获取当前天
public static String getToday(String format) {
Calendar calendar = Calendar.getInstance();
return DateUtil.getDateText(calendar.getTime(), format);
}
