public SimpleDateFormat df1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

// time_str 为时间字符串

public String minute_fromt (String time_str,Integer is_gt) {

// start_time is_gt 为 1 ; end_time is_gt为 0

is_gt = is_gt*5;

Calendar calendar = Calendar.getInstance();

try {

calendar.setTime(df1.parse(time_str));

} catch (ParseException e) {

e.printStackTrace();

}

int minute = calendar.get(Calendar.MINUTE);

int sec = calendar.get(Calendar.SECOND);

if (sec == 0) {

is_gt = 0;

}

// 计算整10分钟 把5换成10

minute = Math.round(minute/5*5);//计算5的整数分钟

calendar.set(Calendar.MINUTE, minute+is_gt);

calendar.set(Calendar.SECOND, 0);

String time =df1.format(calendar.getTime());

return time;

}

public String hour_fromt (String time_str,Integer is_gt) {

// start_time is_gt 为 1 ; end_time is_gt为 0

Calendar calendar = Calendar.getInstance();

try {

calendar.setTime(df1.parse(time_str));

} catch (ParseException e) {

e.printStackTrace();

}

int hour = calendarget(Calendar.HOUR);

int minute = calendar.get(Calendar.MINUTE);

int sec = calendar.get(Calendar.SECOND);

if (sec == 0 && minute==0) {

is_gt = 0;

}

calendar.set(Calendar.HOUR, hour+is_gt);

calendar.set(Calendar.MINUTE, 0);

calendar.set(Calendar.SECOND, 0);

String time =df1.format(calendar.getTime());

return time;

}

public String day_fromt (String time_str,Integer is_gt) {

// start_time is_gt 为 1 ; end_time is_gt为 0

Calendar calendar = Calendar.getInstance();

try {

calendar.setTime(df1.parse(time_str));

} catch (ParseException e) {

e.printStackTrace();

}

int day = calendar.get(Calendar.DATE);

int hour = calendar.get(Calendar.HOUR);

int minute = calendar.get(Calendar.MINUTE);

int sec = calendarget(Calendar.SECOND);

if (sec == 0 && minute==0 && hour==0) {

is_gt = 0;

}

calendar.set(Calendar.DATE, day+is_gt);

calendar.set(Calendar.HOUR, 0);

calendar.set(Calendar.MINUTE, 0);

calendar.set(Calendar.SECOND, 0);

String time =df1.format(calendar.getTime());

return time;

}