compare date from textfield - ios

Question

I have implemented two textFields From and To in ViewController.When the user selects the textField he is able to select the date from the calendar. The selected Date is stored in the TextField as
YYYY-MM-dd format.
And I have implemented a calculate button in ViewController.When the Two TextField are filled i need to do some work.
When the two textField are filled and the From TextField is greater , I want to display an alert when the From TextField date is Greater than To TextField.
How can i Compare it...?

Answer 1

Perfect solution
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"yyyy-MM-dd"];
NSString *textFieldDateString1 = #"2016-07-14";
NSString *textFieldDateString2 = #"2016-07-15";
NSDate *date1 = [dateFormatter dateFromString:textFieldDateString1];
NSDate *date2 = [dateFormatter dateFromString:textFieldDateString2];
if ([date1 compare:date2] == NSOrderedDescending) {
NSLog(#"date1 is later than date2");
} else if ([date1 compare:date2] == NSOrderedAscending) {
NSLog(#"date1 is earlier than date2");
} else {
NSLog(#"dates are the same");
}
Printed Result is
date1 is earlier than date2
Date Comparision
Compare Two dates

Answer 2

NSDateFormatter * df = [[NSDateFormatter alloc] init];
[df setDateFormat: #"yyyy-MM-dd"];
NSDate * dt1 ;
NSDate * dt2 ;
dt1 = [df dateFromString: txt1.text];
dt2 = [df dateFromString: txt2.text];
NSComparisonResult result = [dt1 compare: dt2];
switch (result) {
case NSOrderedAscending:
NSLog(#"%# is greater than %#", dt2, dt1);
break;
case NSOrderedDescending:
NSLog(#"%# is less %#", dt2, dt1);
break;
case NSOrderedSame:
NSLog(#"%# is equal to %#", dt2, dt1);
break;
default:
NSLog(#"erorr dates %#, %#", dt2, dt1);
break;
}
Hope this will help you....

Answer 3

i think you are looking for this functionality..
NSCalendar* currentCalendar = [NSCalendar currentCalendar];
NSCalendarUnit unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute;
NSDateComponents *differenceComponents = [currentCalendar components:unitFlags fromDate:postdate toDate:[NSDate date] options:0];
NSInteger yearDifference = [differenceComponents year];
NSInteger monthDifference = [differenceComponents month];
NSInteger dayDifference = [differenceComponents day];
NSInteger hourDifference = [differenceComponents hour];
NSInteger minuteDifference = [differenceComponents minute];
i hope this will help you..

Answer 4

First you have to convert this two text field string date into NSDate object and and use compare: method of date to compare date.
NSString *dateString1 = #"2016-05-31"; //First text field value
NSString *dateString2 = #"2016-05-31"; //Second text field value
NSDateFormatter *dateFormatter=[NSDateFormatter new];
[dateFormatter setDateFormat:#"YYYY-MM-dd"];
NSDate *date1=[dateFormatter dateFromString:dateString1];
NSDate *date2=[dateFormatter dateFromString:dateString2];
if ([date1 compare:date2] == NSOrderedDescending) {
NSLog(#"date1 is later than date2");
} else if ([date1 compare:date2] == NSOrderedAscending) {
NSLog(#"date1 is earlier than date2");
} else {
NSLog(#"dates are the same");
}