I missed my suhoor...

I'm not clued-up with the Hijri dates, it read 15th July on my calendar... I completely forgot... So...I didn't fast today... ...Can I still fast tomorrow? Of course! It would have been better if you fasted today as well as tomorrow, but tomorrow is what all the fuss is about (ʿĀshūrāʾ). Abū Qatādah رضي الله عنه reported: The Messenger of Allāh ﷺ was asked about fasting the tenth of Muḥarram (TOMORROW), and he replied: “It is an expiation for the sins of the preceding year.” [Muslim] Ibn ʿAbbās رضي الله عنه said: I never saw the Prophet ﷺ seeking to fast a day, giving it preference over another, except this day, the day of Āshūrā (TOMORROW). [Bukhari] The day of ʿĀshūrāʾ comes ONLY ONCE A YEAR, so don't let the opportunity slip you by.