iOS converts standard time to timestamp

NSDateFormatter *date=[[nsdateformatteralloc]init];

[Date setdateformat:@ "Yyyy-mm-dd HH:mm:ss"];

nsdate *d=[datedatefromstring: thedate];

nstimeinterval late=[dtimeIntervalSince1970]*1;

nsdate* dat = [nsdatedatewithtimeintervalsincenow: 0];

nstimeinterval now=[dattimeIntervalSince1970]*1;

nsstring *timestring=@ "";

nstimeinterval cha=now-late;

if (cha/3600<1) {

TimeString = [nsstringstringwithformat:@ "%f", cha/];

TimeString = [timestringsubstringtoindex: timestring. Length-7];

int num= [timestringintvalue];

if (Num <=1) {

TimeString = [nsstringstringwithformat:@ " just ..."];

}Else{

TimeString = [nsstringstringwithformat:@ "%@ minutes ago ", timestring];

}

}

if (cha/3600>1&&cha/86400<1) //86400=1 days

{

TimeString = [nsstringstringwithformat:@ "%f", cha/3600];

TimeString = [timestringsubstringtoindex: timestring. Length-7];

timestring=[nsstringstringwithformat:@ "%@ hours ago ", timestring];

}

if (cha/86400>1)

{

TimeString = [nsstringstringwithformat:@ "%f", cha/86400];

TimeString = [timestringsubstringtoindex: timestring. Length-7];

int num=[timestringintvalue];

if (num<2) {

timestring=[nsstringstringwithformat:@ " yesterday "];

}Elseif (num==2) {

TimeString = [nsstringstringwithformat:@ " the day before yesterday "];

}Elseif (num>2&&num<7) {

TimeString = [nsstringstringwithformat:@ "%@ days ago ", timestring];

}Elseif (num >=7 && num <=) {

TimeString = [nsstringstringwithformat:@ "1 weeks ago "];

}Elseif(num > && num <=365) {

int month=cha/(86400*);

timestring=[nsstringstringwithformat:@ "%d", month];

TimeString = [nsstringstringwithformat:@ "%@ weeks ago ", timestring];

}Elseif (num >365) {

int year=cha/(86400*365);

timestring=[nsstringstringwithformat:@ "%d", year];

TimeString = [nsstringstringwithformat:@ "%@ years ago ", timestring];

}

}

iOS converts standard time to timestamp