Date in Objective-C

To use dates in Objective-C, you can utilize the NSDate class. Here are some examples:

1. Getting the current date and time:

NSDate *currentDate = [NSDate date];

2. Creating a date from a specified string:

NSString *dateString = @"2021-08-20 14:30:00";

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSDate *customDate = [dateFormatter dateFromString:dateString];

3. Converting a date to a string with a specific format:

NSDate *someDate = [NSDate date];

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

[dateFormatter setDateFormat:@"dd/MM/yyyy"];

NSString *formattedDate = [dateFormatter stringFromDate:someDate];

4. Comparing two dates:

NSDate *date1 = [NSDate date];

NSDate *date2 = [NSDate dateWithTimeIntervalSinceNow:-86400]; // 1 day ago

NSComparisonResult result = [date1 compare:date2];

if (result == NSOrderedDescending) {

    NSLog(@"date1 is later than date2");

} else if (result == NSOrderedAscending) {

    NSLog(@"date1 is earlier than date2");

} else {

    NSLog(@"date1 and date2 are the same");

}

5. Adding or subtracting time interval from a date:

NSDate *someDate = [NSDate date];

NSDate *newDate = [someDate dateByAddingTimeInterval:3600]; // Adds 1 hour

NSDate *modifiedDate = [someDate dateByAddingTimeInterval:-86400]; // Subtracts 1 day

These are just some basic examples of how to work with dates in Objective-C. There are many more features and functions available in the NSDate class that can be used to manipulate or format dates as needed.