DateUtils（一个日期工具类）
*/
ONLY_HOUR {
public String getValue() {
return "yyyy-MM-dd HH";
}
},
/**
格式："yyyy-MM-dd"
*/
ONLY_DAY {
public String getValue() {
return "yyyy-MM-dd";
}
},
/**
格式："yyyy-MM"
*/
ONLY_MONTH {
public String getValue() {
return "yyyy-MM";
}
},
/**
格式："MM-dd"
*/
ONLY_MONTH_DAY {
public String getValue() {
return "MM-dd";
}
},
/**
格式："MM-dd HH:mm"
*/
ONLY_MONTH_SEC {
public String getValue() {
return "MM-dd HH:mm";
}
},
/**
格式："HH:mm:ss"
*/
ONLY_TIME {
public String getValue() {
return "HH:mm:ss";
}
},
/**
格式："HH:mm"
*/
ONLY_HOUR_MINUTE {
public String getValue() {
return "HH:mm";
}
};
public abstract String getValue();
}
/**
获取当前时间 格式---->2019-08-04 13:30:29
*/
public static String getNowTime(DateFormat format) {
String nowtime = null;
Calendar calendar = Calendar.getInstance();
Date dateNow = calendar.getTime();
SimpleDateFormat sdf = new SimpleDateFormat(format.getValue(), Locale.CHINA);
nowtime = sdf.format(dateNow);
return nowtime;
}
/**
将一个日期字符串转换成 Data 对象 string-->date
@param dateString 日期字符串
@param format 转换格式
@return
*/
public static Date stringToDate(String dateString, DateFormat format) {
Date date = null;
SimpleDateFormat sdf = new SimpleDateFormat(format.getValue(), Locale.CHINA);
try {
date = sdf.parse(dateString);
} catch (ParseException e) {
e.printStackTrace();
}
return date;
}
/**
将 date 转换成字符串 date--->string
@param date 日期
@param format 日期目标格式
@return
*/
public static String dateToString(Date date, DateFormat format) {
String string = "";
SimpleDateFormat sdf = new SimpleDateFormat(format.getValue(), Locale.CHINA);
string = sdf.format(date);
return string;
}
/**
获取指定日期
@param date 指定日期
@return 返回值为： "周日", "周一", "周二", "周三", "周四", "周五", "周六"
*/
public static String getWeekOfDate(Date date) {
String[] weekDays = {"周日", "周一", "周二", "周三", "周四", "周五", "周六"};
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
int week = calendar.get(Calendar.DAY_OF_WEEK) - 1;
if (week < 0)
week = 0;
return weekDays[week];
}
/**
获取指定日期对应周几的序列
@param date 指定日期
@return 周一：1 周二：2 周三：3 周四：4 周五：5 周六：6 周日：7
*/
public static int getIndexWeekOfDate(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
int index = calendar.get(Calendar.DAY_OF_WEEK);
if (index == 1) {
return 7;
} else {
return --index;
}
}
/**
获取当前月份
*/
public static int getNowMonth() {
Calendar calendar = Calendar.getInstance();
return calendar.get(Calendar.MONTH) + 1;
}
/**
获取当前月号
*/
public static int getNowDay() {
Calendar calendar = Calendar.getInstance();
return calendar.get(Calendar.DATE);
}
/**
获取当前年份
*/
public static int getNowYear() {
Calendar calendar = Calendar.getInstance();
return calendar.get(Calendar.YEAR);
}
/**
获取本月份的天数
*/
public static int getNowDaysOfMonth() {
Calendar calendar = Calendar.getInstance();
return daysOfMonth(calendar.get(Calendar.YEAR), calendar.get(Calendar.DATE) + 1);
}
/**
计算两个日期之间的年份差距
@param firstDate
@param secondDate
@return
*/
public static int getYearGapOfDates(Date firstDate, Date secondDate) {
if (firstDate == null || secondDate == null) {
return 0;
}
Calendar helpCalendar = Calendar.getInstance();
helpCalendar.setTime(firstDate);
int firstYear = helpCalendar.get(Calendar.YEAR);
helpCalendar.setTime(secondDate);
int secondYear = helpCalendar.get(Calendar.YEAR);
return secondYear - firstYear;
}
/**
计算两个日期之间的天数差
@param startDate
@param endDate
@return
*/
public static int getDaysGapOfDates(Date startDate, Date endDa
te) {
int date = 0;
if (startDate != null && endDate != null) {
date = getDaysBetween(startDate, endDate);
}
return date;
}
/**
计算两个日期之间的月份差距
@param firstDate
@param secondDate
@return
*/
public static int getMonthGapOfDates(Date firstDate, Date secondDate) {
if (firstDate == null || secondDate == null) {
return 0;
}
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