通常計算天數的的：
nscalendar *gregorian = [[nscalendar alloc]
initwithcalendaridentifier:nsgregoriancalendar];
[gregorian setfirstweekday:2];
nsdateformatter *dateformatter = [[nsdateformatter alloc] init];
[dateformatter setdateformat:@"yyyy-mm-dd hh:mm:ss"];
nsdate *fromdate = [dateformatter datefromstring:@"2014-06-23 12:02:03"];
nsdate *todate = [nsdate date];
nsdatecomponents *daycomponents = [gregorian components:nsdaycalendarunit fromdate:fromdate todate:todate options:0];
計算月數：
nsindexpath *indexpath=[nsindexpath indexpathforrow:3 insection:0];
uitableviewcell *cell = [_table cellforrowatindexpath:indexpath];
nscalendar *gregorian = [[nscalendar alloc]
initwithcalendaridentifier:nsiso8601calendar];
// [gregorian setfirstweekday:2];
nsdateformatter *dateformatter = [[nsdateformatter alloc] init];
[dateformatter setdateformat:@"yyyy-mm-dd"];
nsdate *fromdate;
nsdate *todate;
[gregorian rangeofunit:nscalendarunitday startdate:&fromdate interval:null fordate:[dateformatter datefromstring:_begindatetime]];
// [gregorian rangeofunit:nsdaycalendarunit startdate:&fromdate interval:null fordate:[dateformatter datefromstring:_begindatetime]];
[gregorian rangeofunit:nscalendarunitday startdate:&todate interval:null fordate:[dateformatter datefromstring:_enddatetime]];
nsdatecomponents *daycomponents = [gregorian components:nscalendarunitday fromdate:fromdate todate:todate options:0];
_howlong = round(daycomponents.day/30.0);
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