Objective-C Categories for Converting NSNumber containing military time to NSDate

NSNumber+SUBNumberAdditions.h

#import <Foundation/Foundation.h>

@interface NSNumber (SUBNumberAdditions)

- (NSDate *)sub_DateFromMilitaryTime;
- (BOOL)sub_isValidMilitaryTime;

@end

NSNumber+SUBNumberAdditions.m

#import "NSNumber+SUBNumberAdditions.h"

@implementation NSNumber (SUBNumberAdditions)

- (NSDate *)sub_DateFromMilitaryTime {
    if (![self sub_isValidMilitaryTime]) {
        NSException *exp = [NSException exceptionWithName:@"SUBInvalidMilitaryTimeInput"
                                                   reason:@"The inputted military time cannot be above 2359 (11:59pm)"
                                                 userInfo:nil];
        @throw exp;
    }
    NSDateComponents *comps = [NSDateComponents new];
    [comps setMinute:[self intValue] % 100];
    [comps setHour:floor(self.intValue / 100)];

    NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    return [gregorian dateFromComponents:comps];
}

- (BOOL)sub_isValidMilitaryTime {
    BOOL valid = ([self intValue] > 2359) ? NO : YES;
    return valid;
}

@end