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获取当前calendar

calendar cd = calendar.getinstance();

//日加7天

cd.add(calendar.day_of_week,7);

根据日期获取calendar

calendar cd = calendar.getinstance();

date d = new date();

cd.settime(d);

cd.add(calendar.day_of_week,7);

根据字符串获取

dateformat  df = new simpledateformat("yyyy-mm-dd");

date d = df.parse("2014-02-19");

calendar cd = calendar.getinstance();

cd.settime(d);

cd.add(calendar.day_of_week,7);

日期加法

cd.add(calendar.day_of_week,7);

日期减法

cd.add(calendar.day_of_week,7);

从date到string

dateformat df = new simpledateformat("yyyy-mm-dd");

date d = new date();

string dstr = df.format(d);

从string到日期

dateformat df = new simpledateformat("yyyy-mm-dd");

date d = df.parse("2014-02-19");

从date到calendar

calendar cd1 = calendar.getinstance();

date sd1 = df.parse(startdate);        

cd1.settime(sd1);

如：

startdate="2014-02-19";

从calender到date

calendar cd1 = calendar.getinstance();

date d = cd1.gettime();

格式化date

dateformat df = new simpledateformat("yyyy-mm-dd");

string dstr = df.format(new date());

格式化calendar

dateformat df = new simpledateformat("yyyy-mm-dd");

calendar cd1 = calendar.getinstance();

string dstr = df.format(cd1.gettime());

格式化日期字符串

dateformat df = new simpledateformat("yyyy-mm-dd");

date d = df.parse("2014-02-19");

dateformat df1 = new simpledateformat("mm-dd");

string dstr2 = df1.format(d);