(Objective-C) Get Certificate Valid To/From Dates

Demonstrates how to get the certificate "valid from" and "valid to" dates.

Note: This example requires Chilkat v11.0.0 or greater.

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#import <CkoCert.h>
#import <CkoDateTime.h>
#import <CkoDtObj.h>

BOOL success = NO;

CkoCert *cert = [[CkoCert alloc] init];

success = [cert LoadFromFile: @"qa_data/certs/testCert.cer"];
if (success == NO) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

// Get the certificate valid-from date/time
CkoDateTime *ckdt = [[CkoDateTime alloc] init];
[ckdt SetFromRfc822: cert.ValidFromStr];

// Get the local timestamp string.
NSLog(@"%@%@",@"Valid from: ",[ckdt GetAsTimestamp: YES]);
// Valid from: 2017-03-17T19:00:00-05:00

// Now get the date/time as another object where we can get the individual numeric date parts.
CkoDtObj *dt = [[CkoDtObj alloc] init];
[ckdt ToDtObj: YES dtObj: dt];

NSLog(@"%d%@%d%@%d%@%d%@%d",[dt.Day intValue],@"/",[dt.Month intValue],@"/",[dt.Year intValue],@"  ",[dt.Hour intValue]
    ,@":",[dt.Minute intValue]);

// Get the certificate valid-to date/time
[ckdt SetFromRfc822: cert.ValidToStr];

NSLog(@"%@%@",@"Valid to: ",[ckdt GetAsTimestamp: YES]);
// Valid to: 2020-03-18T18:59:59-05:00new DtObj dt;
[ckdt ToDtObj: YES dtObj: dt];

NSLog(@"%d%@%d%@%d%@%d%@%d",[dt.Day intValue],@"/",[dt.Month intValue],@"/",[dt.Year intValue],@"  ",[dt.Hour intValue]
    ,@":",[dt.Minute intValue]);