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

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

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

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

BOOL success = [cert LoadFromFile: @"qa_data/certs/testCert.cer"];
if (success != YES) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

// Get the certificate valid-from date/time
CkoDateTime *ckdt = [cert GetValidFromDt];
// 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 = [ckdt GetDtObj: YES];
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 = [cert GetValidToDt];
NSLog(@"%@%@",@"Valid to: ",[ckdt GetAsTimestamp: YES]);
// Valid to: 2020-03-18T18:59:59-05:00
dt = [ckdt GetDtObj: YES];
NSLog(@"%d%@%d%@%d%@%d%@%d",[dt.Day intValue],@"/",[dt.Month intValue],@"/",[dt.Year intValue],@"  ",[dt.Hour intValue]
    ,@":",[dt.Minute intValue]);