Question

How i can port this set of code in wp7

-(NSString *) timeSincePosted:(NSString *)ad_date {
if (!ad_date || ([ad_date compare:@""] == NSOrderedSame) || ([ad_date rangeOfString:@"-"].location == NSNotFound))
    return @"";

// date format
//2010-04-22,  5:27PM EDT
NSDateFormatter *dateFormatter_CL = [[[NSDateFormatter alloc] init] autorelease];
NSLocale *enUSPOSIXLocale = [[[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"] autorelease];
[dateFormatter_CL setLocale:enUSPOSIXLocale];
[dateFormatter_CL setDateFormat:@"yyyy-MM-dd, h:mma zzz"]; 
NSDate *CL_adDate = [dateFormatter_CL dateFromString: ad_date];

// Time since now
NSTimeInterval deltaT = -[CL_adDate timeIntervalSinceNow];
int deltaMin = deltaT/60;
int deltaHr = deltaMin/60;
int deltaDay = deltaHr/24;

if (deltaMin < 1) return [NSString stringWithString:@"0 mins"];
if (deltaMin == 1) return [NSString stringWithString:@"1 min"];
if (deltaMin < 60) return [NSString stringWithFormat:@"%d mins", deltaMin];
if (deltaHr <= 1) return [NSString stringWithString:@"1 hr"];
if (deltaHr < 24) return [NSString stringWithFormat:@"%d hrs", deltaHr];
if (deltaDay < 2) return [NSString stringWithString:@"1 day ago"];
return [NSString stringWithFormat:@"%d days ago", deltaDay];
}

Answer 1

The Objective C code first parses date and time from a string and then turns it into an easily readable from like “1 day ago”.

While Rowland Shaw’s code nicely solves the second part, it fails to parse the date/time string because C# doesn’t support time zone names like “CDT”. In order to solve that, you should look at the method ConvertZoneToLocalDifferential in https://stackoverflow.com/a/284785/413337. The method preprocesses the date/time string so it’s parsable by C#.