How to sort an array?

Hi!

I'm very new on programming c and need a little help with sorting an array...

I have the following Array:

LastBlocks[i].FileDate
LastBlocks[i].LastBlock
LastBlocks[i].StartCluster
LastBlocks[i].WriteDate

FYI: [i] counts up to max. 300

Now I'm looking for a possibility, how to sort this array by LastBlocks[i].WriteDate?

The content of LastBlocks[i].WriteDate is (wmjd << 16 | hour << 8 | min);
LastBlocks[i].WriteDate contains the time/date when the entry was added to the list...

I would like to have the newest entry first and the oldest one at the end of the array after sorting...

Could you help my with that?

Thanks in advance,
Gerti