Get first day in a month from NSCalendar

Question

I have this subset of a method that needs to get day one of the current month.

NSDate *today = [NSDate date];  // returns correctly 28 february 2013
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [[NSDateComponents alloc] init];
components.day = 1;
NSDate *dayOneInCurrentMonth = [gregorian dateByAddingComponents:components toDate:today options:0];

dayOneInCurrentMonth then prints out 2013-03-01 09:53:49 +0000, the first day of the next month.

How do I get day one of the current month?

score 17 · Accepted Answer · answered Feb 28 '13 at 10:06

17

Your logic is wrong: Instead of setting the date's day to 1, you're adding a day to the current date.

Try something like that:

NSDate *today = [NSDate date];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

NSDateComponents *components = [gregorian components:(NSEraCalendarUnit | NSYearCalendarUnit | NSMonthCalendarUnit) fromDate:today];
components.day = 1;

NSDate *dayOneInCurrentMonth = [gregorian dateFromComponents:components];

answered Feb 28 '13 at 10:06

Fabian Kreiser

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Of course! Misread the method name. Thank you! Will accept answer :-) – bogen Feb 28 '13 at 10:08
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Ok, @Fabian Kreiser, I used the code as is and it gives me result: `2015-05-31 21:00:00 UTC`. Today is `2015-06-08 8:36`. It does not returns 1st day, but last from previous month? – new2ios Jun 08 '15 at 07:37

score 1 · Answer 2 · answered Feb 28 '13 at 10:06

1

You want [NSCalender dateFromComponents:] instead:

NSDate *dayOneInCurrentMonth = [gregorian dateFromComponents:components];

answered Feb 28 '13 at 10:06

trojanfoe

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score 1 · Answer 3 · answered Feb 11 '15 at 22:57

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Easy way of getting to the 1st from a given date:

NSDate *first = [gregorian dateBySettingUnit:NSCalendarUnitDay value:1 ofDate:date options:0];

answered Feb 11 '15 at 22:57

Graham Perks

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score 1 · Answer 4 · answered Jan 20 '16 at 15:33

Easy Way to get first and last date of previous month is :

NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *comp = [gregorian components:(NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay ) fromDate:[NSDate date]];

//TO GET PREVIOUS MONTH LAST DAY
[comp setMonth:[comp month]];
[comp setDay:1];
NSDate *tDateMonth = [gregorian dateFromComponents:comp];
NSLog(@"LAST DAY OF PREVIOUS MONTH ;  %@", tDateMonth);

//TO GET PREVIOUS MONTH FIRST DAY
[comp setMonth:[comp month]-1];
[comp setDay:3];
NSDate *td = [gregorian dateFromComponents:comp];
NSLog(@"FIRST DAY OF PREVIOUS MONTH ;  %@", td);

Hope this helps

score 0 · Answer 5 · answered Mar 30 '16 at 02:46

By creating new variable is expensive on memory usage, it's better using date formatter to get the first day of the current month

today = [NSDate date];

firstDayDateFormatter = [[NSDateFormatter alloc] init];
[firstDayDateFormatter setDateFormat:@"01-MM-yyyy"];
dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"dd-MM-yyyy"];
[dateFormatter setLocale:[NSLocale localeWithLocaleIdentifier:@"en_US"]];
firstDayOfTheMonth = [mdfDateFormat dateFromString:[firstDayDateFormatter stringFromDate:today]];

score 0 · Answer 6 · answered Aug 05 '17 at 10:07

0

NSDate *startDate = nil;
[[NSCalendar currentCalendar] rangeOfUnit:NSCalendarUnitMonth startDate:&startDate interval:NULL forDate:date];

return startDate;

answered Aug 05 '17 at 10:07

leonardosccd

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Get first day in a month from NSCalendar

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