Table:
0
A
B
C
D
E
F
G
1
Week
Date
Opponent
Location
Final Score
Attendance
Record
2
1
August 19
@ Rough Riders
Landsdowne Park
L 44–7
18470
0–1–0
3
1
August 22
Alouettes
Varsity Stadium
W 15–14
19492
1–1–0
4
2
September 1
@ Tiger-Cats
Civic Stadium
L 31–24
20946
1–2–0
5
3
September 5
Tiger-Cats
Varsity Stadium
L 26–17
26781
1–3–0
6
4
September 13
@ Alouettes
Molson Stadium
L 24–21
22620
1–4–0
7
5
September 20
Rough Riders
Varsity Stadium
L 17–14
20166
1–5–0
8
6
September 27
@ Rough Riders
Landsdowne Park
L 28–4
18500
1–6–0
9
7
October 4
Alouettes
Varsity Stadium
L 14–10
16424
1–7–0
10
8
October 11
@ Tiger-Cats
Civic Stadium
L 28–15
16583
1–8–0
11
8
October 13
Tiger-Cats
Varsity Stadium
W 37–0
16583
2–8–0
12
9
October 18
@ Rough Riders
Landsdowne Park
W 41–0
14313
3–8–0
13
10
October 25
Rough Riders
Varsity Stadium
W 42–24
23334
4–8–0
14
11
November 1
Alouettes
Varsity Stadium
L 44–7
26813
4–9–0

Questions and formulas:
Question: Name the date for  l 28–15 
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,E1="L 28–15"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G14,E2:E14="L 28–15"),2))
Level: medium