unparse-date.m

#import "ISO8601DateFormatter.h"

int main(int argc, const char **argv) {
	@autoreleasepool {
		ISO8601DateFormatter *formatter = [[ISO8601DateFormatter alloc] init];
		formatter.format = ISO8601DateFormatCalendar;
		
		BOOL forceUTC = NO;
		
		while (argv[1]) {
			if (strcmp(argv[1], "--include-time") == 0)
				formatter.includeTime = YES;
			else if (strcmp(argv[1], "--force-utc") == 0)
				forceUTC = YES;
			else
				break;
			--argc;
			++argv;
		}
		
		while(--argc) {
			NSString *arg = [NSString stringWithUTF8String:*++argv];
			NSTimeZone *timeZone = nil;
			NSDate *date = [formatter dateFromString:arg timeZone:&timeZone];
			if (forceUTC)
				timeZone = [NSTimeZone timeZoneWithAbbreviation:@"UTC"];
			printf("%s\n", [[NSString stringWithFormat:@"%@:\t%@", arg, [formatter stringFromDate:date timeZone:timeZone]] UTF8String]);
		}
		
		return 0;
	}
}