解决iOS中时间字符串转为NSDate问…

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需求：

Tue Sep 06 21:37:19 +0800 2011

转换为NSDate

struct tm sometime;

constchar *formatString ="%a %b %d %H:%M:%S %z %Y";

(void)strptime_l("Tue Sep 06 21:37:19 +0800 2011",formatString, &sometime, NULL);

NSLog(@"NSDate is %@", [NSDatedateWithTimeIntervalSince1970:mktime(&sometime)]);

Mac里可以用这个：

NSDate *dateStatus = [NSDatedateWithNaturalLanguageString:@"TueSep 06 21:37:19 +0800 2011"];

如果没有时区的话，这个也行，有时区就不太会了。

NSDateFormatter *df = [[[NSDateFormatteralloc] init]autorelease];

[df setDateFormat:@"EEE MMM dd HH:mm:ss yyyy"];

NSDate*date_new = [df dateFromString:@"Tue Jan 05 21:15:27 2010"];

//NSString *time=@"Wed, 4 Nov 2009 03:25:31 GMT";

NSDate *today= nil;

NSDateFormatter *df =[NSDateFormatter new];

[df setLocale:[[[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"] autorelease]];

df.dateFormat = @"EEE,dd MMM yyyy HH:mm:ss zzz";

today = [df dateFromString:time];

[df release];

附：

C++标准库中用来计算时间差的函数
头文件 < time.h >

double difftime(
time_t timer1,
time_t timer0
);
double _difftime32(
__time32_t timer1,
__time32_t timer0
);
double _difftime64(
__time64_t timer1,
__time64_t timer0
);

C++标准库用来格式化输出时间字符串
头文件 < time.h >

size_t strftime(
char *strDest,
size_t maxsize,
const char *format,
const struct tm *timeptr
);
size_t _strftime_l(
char *strDest,
size_t maxsize,
const char *format,
const struct tm *timeptr,
_locale_t locale
);
size_t wcsftime(
wchar_t *strDest,
size_t maxsize,
const wchar_t *format,
const struct tm *timeptr
);
size_t _wcsftime_l(
wchar_t *strDest,
size_t maxsize,
const wchar_t *format,
const struct tm *timeptr,
_locale_t locale
);

The formatting codes for strftime are listed below:

%a
Abbreviated weekday name

%A
Full weekday name

%b
Abbreviated month name

%B
Full month name

%c
Date and time representation appropriate for locale

%d
Day of month as decimal number (01 – 31)

%H
Hour in 24-hour format (00 – 23)

%I
Hour in 12-hour format (01 – 12)

%j
Day of year as decimal number (001 – 366)

%m
Month as decimal number (01 – 12)

%M
Minute as decimal number (00 – 59)

%p
Current locale's A.M./P.M. indicator for 12-hour clock

%S
Second as decimal number (00 – 59)

%U
Week of year as decimal number, with Sunday as first day of week(00 – 53)

%w
Weekday as decimal number (0 – 6; Sunday is 0)

%W
Week of year as decimal number, with Monday as first day of week(00 – 53)

%x
Date representation for current locale

%X
Time representation for current locale

%y
Year without century, as decimal number (00 – 99)

%Y
Year with century, as decimal number

%z, %Z
Either the time-zone name or time zone abbreviation, depending onregistry settings; no characters if time zone is unknown

%%
Percent sign

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