Date and Time Format in iOS application - ios

Question

I am getting below date format from response
2015-12-23 05:17:04
But, I want to check date and time like,
date == today ?
date == yesterday ?
time == 1 hour
time == 2 hour till 9 hour
how to do it ?

Answer 1

To check whether date is today's, yesterday's, tomorrow's date etc... you can use NSDate-Extensions
ex:
NSDate *date = [self convertStringToDate:#"2015-12-24 12:40:04" formate:#"yyyy-MM-dd HH:mm:ss"];
NSLog(#"%d", [date isToday]);
NSLog(#"%d", [date isTomorrow]);
NSLog(#"%d", [date isYesterday]);
- (NSDate *)convertStringToDate: (NSString *)date formate:(NSString *)formate {
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setLocale:[[NSLocale alloc] initWithLocaleIdentifier:#"en_US"]];
[dateFormat setDateFormat:formate];
return [dateFormat dateFromString:date];
}

Answer 2

Use this method give you NSString back. you can compare string or time in method.
-(NSString* )AgoStringFromTime:(NSDate*)dateTime
{
NSDictionary *timeScale = #{#"sec" :#1,
#"min" :#60,
#"hr" :#3600,
#"day" :#86400,
#"week" :#605800,
#"month":#2629743,
#"year" :#31556926};
NSString *scale;
int timeAgo = 0-(int)[dateTime timeIntervalSinceNow];
if (timeAgo < 60) {
scale = #"sec";
} else if (timeAgo < 3600) {
scale = #"min";
} else if (timeAgo < 86400) {
scale = #"hr";
} else if (timeAgo < 605800) {
scale = #"day";
} else if (timeAgo < 2629743) {
scale = #"week";
} else if (timeAgo < 31556926) {
scale = #"month";
} else {
scale = #"year";
}
timeAgo = timeAgo/[[timeScale objectForKey:scale] integerValue];
NSString *s = #"";
if (timeAgo > 1) {
s = #"s";
}
return [NSString stringWithFormat:#"%d %#%#", timeAgo, scale, s];
}

Answer 3

NSDate *date = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateFormat = [NSString stringWithFormat:#"yyyyMMddHHmmss"];
NSString *now = [dateFormatter stringFromDate:date];
You can try above code
Best wish

Answer 4

1.frist you can format your string to date,like this:
+ (NSDate *)dateFromString:(NSString *)dateString {
if (!dateString) {
return nil;
}
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat: #"yyyy-MM-dd HH:mm:ss"];
[formatter setLocale:[NSLocale currentLocale]];
NSDate *date= [formatter dateFromString:dateString];
return date;
}
2.then,you can use methods of NSDate,
+ (instancetype)date;//get current
- (NSTimeInterval)timeIntervalSinceDate:(NSDate *)refDate;//Returns the interval between the receiver and another given date.