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What you're looking at is the effect of tolerance, more specifically a crystal that is a bit too far away from the 12 kHz you quote. 30 seconds in 24 hours represent an error of roughly 0.035%, which would mean that your crystal is actually oscillating at 11996 Hz.
In my case the clock is going forward in time. Would this mean my crystal is at 12004khz? Do you think replacing the crystal would help, or this is pretty much imposible to get it right? Thank you very much! Saludos!