Print all era in Japanese Calendar.

jEras.m

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{

    @autoreleasepool {
        NSCalendar *japanese = [[NSCalendar alloc] initWithCalendarIdentifier:NSJapaneseCalendar];
        NSLocale *aLocale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"];

        NSDateComponents *comps = [[NSDateComponents alloc] init];
        comps.year = 1;
        comps.month = 12;
        comps.day = 31;
        for (comps.era = 235; comps.era >= 0; comps.era--) {
            NSDate *aDate = [japanese dateFromComponents:comps];
            NSDateFormatter *aFormatter = [[NSDateFormatter alloc] init];
            aFormatter.calendar = japanese;
            aFormatter.locale = aLocale;
            aFormatter.dateFormat = @"G y/M/d";
            NSLog(@"%@",[aFormatter stringFromDate:aDate]);
        }
    }
    return 0;
}