android日期减少一天,Android获得日期所在月的第一天，最后一天，星期几，昨天今天明天...

Android  获得

星期几&＃xff0c;昨天今天明天 &＃xff0c;日期所在月的第一天和最后一天

最近用到的一些时间控制&＃xff0c;记录一下。

明天的时间戳&＃xff1a;long nextDay &＃61; System.currentTimeMillis() &＃43;24 *60 *60 *1000L;//明天

/**

* 获取传入日期所在月的第一天

*/

public static DategetFirstDayDateOfMonth(final Date date) {

final Calendar cal &＃61; Calendar.getInstance();

cal.setTime(date);

final int last &＃61; cal.getActualMinimum(Calendar.DAY_OF_MONTH);

cal.set(Calendar.DAY_OF_MONTH, last);

return cal.getTime();

}

/**

* 获取传入日期所在月的最后一天

*/

public static DategetLastDayOfMonth(final Date date) {

final Calendar cal &＃61; Calendar.getInstance();

cal.setTime(date);

final int last &＃61; cal.getActualMaximum(Calendar.DAY_OF_MONTH);

cal.set(Calendar.DAY_OF_MONTH, last);

return cal.getTime();

}

/**

* 返回星期几

*/

public static StringgetWeekNameFromMillis(Long millis) {

String weekStr &＃61;"";

if (millis &＃61;&＃61;null || millis &＃61;&＃61;0) {

L.e("时间有错");

return weekStr;

}

int selectDate &＃61;getWeekValueFromMillis(millis);

switch (selectDate) {

case 1:

weekStr &＃61;"周日";

break;

case 2:

weekStr &＃61;"周一";

break;

case 3:

weekStr &＃61;"周二";

break;

case 4:

weekStr &＃61;"周三";

break;

case 5:

weekStr &＃61;"周四";

break;

case 6:

weekStr &＃61;"周五";

break;

case 7:

weekStr &＃61;"周六";

break;

default:

weekStr &＃61;"";

break;

}

return weekStr;

}

/**

* 昨天 今天 明天

*/

public static StringgetDayFromMillis(Long millis) {

String weekStr &＃61;"";

if (millis &＃61;&＃61;null || millis &＃61;&＃61;0) {

L.e("时间有错");

return weekStr;

}

int currentDate &＃61;getWeekValueFromMillis(System.currentTimeMillis());

int selectDate &＃61;getWeekValueFromMillis(millis);

int currentDay &＃61;getDayoFMonthFromMillis(System.currentTimeMillis());

int selectDay &＃61;getDayoFMonthFromMillis(millis);

if (bIsCurrentMonth(millis) && currentDay &＃61;&＃61; (selectDay &＃43;1) && currentDate &＃61;&＃61; (selectDate &＃43;1)) {

return "昨天";

}else if (bIsCurrentMonth(millis) && currentDay &＃61;&＃61; selectDay && currentDate &＃61;&＃61; selectDate) {

return "今天";

}else if (bIsCurrentMonth(millis) && currentDay &＃61;&＃61; (selectDay -1) && currentDate &＃61;&＃61; (selectDate -1)) {

return "明天";

}

return weekStr;

}

/**

* 必须是当前年份&＃xff0c;不能跨年

*/

public static boolean bIsCurrentMonth(long millis) {

Calendar calendar &＃61; Calendar.getInstance(TimeUtils.getDefaultTimeZone(), TimeUtils.getDefaultLocale());

int current &＃61; calendar.get(Calendar.MONTH);

int year &＃61; calendar.get(Calendar.YEAR);

return year &＃61;&＃61;getYearValueOfMillis(millis) && current &＃61;&＃61;getMonthValueFromMillis(millis);

}

public static int getMonthValueFromMillis(long millis) {

Calendar calendar &＃61; Calendar.getInstance(TimeUtils.getDefaultTimeZone(), TimeUtils.getDefaultLocale());

calendar.setTimeInMillis(millis);

return calendar.get(Calendar.MONTH);

}

public static int getYearValueOfMillis(long millis) {

Calendar calendar &＃61; Calendar.getInstance(TimeUtils.getDefaultTimeZone(), TimeUtils.getDefaultLocale());

calendar.setTimeInMillis(millis);

return calendar.get(Calendar.YEAR);

}

public static int getWeekValueFromMillis(long millis) {

Calendar calendar &＃61; Calendar.getInstance(TimeUtils.getDefaultTimeZone(), TimeUtils.getDefaultLocale());

calendar.setTimeInMillis(millis);

return calendar.get(Calendar.DAY_OF_WEEK);

}

public static int getDayoFMonthFromMillis(long millis) {

Calendar calendar &＃61; Calendar.getInstance(TimeUtils.getDefaultTimeZone(), TimeUtils.getDefaultLocale());

calendar.setTimeInMillis(millis);

return calendar.get(Calendar.DAY_OF_MONTH);

}