Here's a further quote from the transcript:
15 MR. IMES: May the record reflect the witness has
16 identified the defendant?
17 THE COURT: The record will so reflect.
18 Q (By Mr. Imes) And is this the individual that Michael
19 McStay was referring to?
20 A Yes, sir.
21 Q You said ultimately, at some point, they were in contact
22 with each other, the defendant and Mike McStay. What was the
23 result of that contact?
24 A They ended up meeting out at the McStay, Joseph and
25 Summer's house out in Fallbrook to go and check on them.
26 Q And when was that?
27 A That was on February 9th.
28 Q February 9th or February 13th?
37
1 A You know what, can I double-check the dates on that, sir?
2 Q Since my memory is different than yours, would it refresh
3 your recollection to see who's correct?
4 A Yes, sir.
5 MR. IMES: With the Court's permission, may he refer to
6 his report?
7 THE COURT: Sure.
8 (Brief pause.)
9 THE WITNESS: Yeah, I stand corrected, sir. I'm sorry,
10 he met Mr. Merritt out there on February 13th, 2010.
If you listen to the whole of redirect which isn't very long (I'm not saying you haven't Mica but for the benefit of the thread - starting at 24:47 in the testimony I linked above
CA - Joey, Summer, Gianni, Joseph Jr McStay Murders - Feb 4th 2010 ) it starts with Mike being asked about his mindset on that Monday when he made the missing persons report and he says he was worried and distraught and agrees that there is a possibility he jumbled up dates because of that and because he had nothing in front of him, calendars, notes or phone records etc, to prompt his memory. From the above transcript it's clear that Det. Bachman was mixing up the 9th with the 13th.