Tax on overseas earnings when moving to SA

I have been working as a teacher in Dubai for 15 years. Prior to this I lived in the UK since 1984 and I was born there. I lived in SA from 1974 to 1984 as a child and gained SA citizenship, bought property and spent holidays in SA whilst teaching in Dubai. I will now move to live in SA on a permanent basis. My question is whether I will be liable to pay tax on my overseas earnings from March to July 2015 (the month I tax return to SA).

No you will not, you will only become a South African tax resident if you choose to settle in SA on a permanent basis going forward and then pay tax in about 6 years time.