Unix Timestamp in Objective-C

Look up the current epoch time and convert between Unix seconds and UTC dates in Objective-C.

Get the current timestamp

#import <Foundation/Foundation.h>
#include <math.h>

int main(void) {
    @autoreleasepool {
        printf("%lld\n", (long long)floor(NSDate.date.timeIntervalSince1970));
    }
}

Timestamp to date

#import <Foundation/Foundation.h>

int main(void) {
    @autoreleasepool {
        NSDate *date = [NSDate dateWithTimeIntervalSince1970:1700000000];
        NSISO8601DateFormatter *format = [NSISO8601DateFormatter new];
        puts([format stringFromDate:date].UTF8String);
    }
}

Date to timestamp

#import <Foundation/Foundation.h>
#include <math.h>

int main(void) {
    @autoreleasepool {
        NSISO8601DateFormatter *format = [NSISO8601DateFormatter new];
        NSDate *date = [format dateFromString:@"2023-11-14T22:13:20Z"];
        printf("%lld\n", (long long)floor(date.timeIntervalSince1970));
    }
}

Open 1700000000 in the converter

Current Unix time

Seconds—

Milliseconds—

UTC: —
My time zone: —

Official reference ↗

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How to use it

Copy the current-time example into your Objective-C environment to read Unix seconds.
Run the second example to display 1700000000 as a UTC date.
Run the last example to convert that date back into seconds.

Use NSDate’s timeIntervalSince1970 for Unix seconds. Its reference-date API instead measures from 2001. NSISO8601DateFormatter reads and writes explicit UTC timestamps.