SUN DOWN EC

Guys , need a bit of info , I am thinking of visiting my partner over easter , hard butt ride to Mossel bay with a pitstop . I can only get away on Thursday around 2 pm and plan to ride as far as I can , hopefully I can make GraaffReinette , sleep over and do the short hop early Friday morning. My concern is that I am not all that keen to ride LOODSBERG pass in the dark , and therefor my question , what is sundown time over easter in the Eastern cape ? Would also assist in my timing for the return trip Monday , plan to do Mosselbay to Bloem , sleep over and depart early to be at work by 8 am .
Not sure if this is a bright idea , but had a look at air tickets and they over the top expensive . only option is a bike ride if I can , like to go visit .