NSDate To and From NSString

Question

It is too much confusing and i have pasted my code below.

I have a eopoc time.

// Function that converts eopc to NSString

NSString * ConvertEpocToDateStr(NSString *epoc)
{

    NSString *res;

    NSTimeInterval sec = [epoc doubleValue]/1000.0;

    NSDate *eDate = [[NSDate alloc] initWithTimeIntervalSince1970:sec];

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


    [dateFormatter setDateFormat:@"MM/dd hh:mm a"];
    dateFormatter.timeZone = [NSTimeZone timeZoneWithAbbreviation:@"IST"];
    NSLog (@" Time in your Zone is %@ ", [[dateFormatter timeZone] description]);
    res = [dateFormatter stringFromDate:eDate];

    return res;
}

// From NSString to back NSDate.

NSDate * backToDate (NSString * dInStr )
{
    NSDateFormatter *dFormatter = [[NSDateFormatter alloc] init];
    [dFormatter setDateFormat:@"MM/dd hh:mm a"];
    dFormatter.timeZone = [NSTimeZone timeZoneWithAbbreviation:@"IST"];

    NSDate *FromString = [dFormatter dateFromString:dInStr];
    return dFromString;

}

And, I tried to print below .

epoc -> 1397600251077

ConvertEpocToDateStr -> 04/16 03:47 am backToDate -> 2000-04-15 22:17:00 +0000

Both should be same right? I am not sure where/what i am missing?

Dateformater from string should be the same format as your string. If your string with date different than date formatter you will get nil — Anton, Aug 07 '14 at 19:58
Thanks for reply. Would you mind showing little more light on it ;) — Whoami, Aug 07 '14 at 20:03
There are literally thousands of examples of how to do this conversion on SO. Your NSLog is wrong since it's logging the description of the date formatter, not the date. Otherwise what you have appears to be correct, converting from Unix epoch to string time. — Hot Licks, Aug 07 '14 at 20:09
You are getting a date in 2000 going backwards because the string time does not contain the year. — Hot Licks, Aug 07 '14 at 20:13
possible duplicate of [NSString to NSDate](http://stackoverflow.com/questions/1353081/nsstring-to-nsdate) — Hot Licks, Aug 07 '14 at 20:15
Do note that you should pay attention to [this issue](http://stackoverflow.com/q/6613110/581994); — Hot Licks, Aug 07 '14 at 20:20
@HotLicks why dont you post an answer, obviously your thought dont fit in the comments lol — meda, Aug 07 '14 at 20:22
@meda - It's been answered already. The code is working as it should. — Hot Licks, Aug 07 '14 at 20:24

score 1 · Answer 1 · answered Aug 07 '14 at 20:08

Of course, you get the same dates. IST is 5.30 h ahead of GMT+0. Since you drop out year in your direct formatter and use the date time string without the year by default it is set to 2000.

Evidently, 2000-04-15 22:17:00 +0000 is the same as 2000-04-16 03:47:00 +0530.

NSDate To and From NSString

1 Answers1