On what date did Adnan's phone ping Leaking Park two weeks after the murder?

In one of her blog posts Susan Simpson revealed that in the four weeks after the murder there was a single other day on which Adnan's phone pinged the Leaking Park L689B tower.
For some reason she did not reveal the date of that call, instead merely stating it had happened "two weeks after Hae's murder". She also posted a scan of the call record. But for some reason and contrary to other call records published by her in the past, the scan image for this call had been edited and the date information removed.

Since this was the only other time Adnan's phone pinged Leaking Park the call seems important, yet we don't even know the exact day the call was made. Can we find out the date?

PS: Looks like SS deleted a comment on her blog asking her about the date of the call. Now i really want to find out!

PPS: Susan has kindly cleared up the confusion. The date in question is Jan 27, 1999. Please refer to the comment section.