# Find the last date/time with criteria

#### sharky12345

##### Well-known Member
I'm trying to find a way I can identify the last date and time in a range but with the condition that it does not fall after another date/time.

So range A2:A1000 has a serial number, range B2:B1000 has a date and time stamp - there will be duplicates of the serial number but each time stamp is unique. On another sheet I have the serial numbers in range C2:C1000 and further date/time stamps in range D2:D1000, I have other data in the range E2:1000.

What I need to do is lookup the value in column A of the first sheet, find it in column C of the 2nd sheet, then go through column D of the 2nd sheet, (where the value in A matches), and find the last date/time without going past the original time in column B of the first sheet, then give me the value from column E on the 2nd.

I've tried to explain as best I can, I know it sound really complicate but maybe this will assist;

So this is sheet 1:

Test workbook.xlsm
AB
1Serial NumberSign Date
2CR200002063401/10/2020 01:22
3CR200002063401/10/2020 01:50
4CR200002063501/10/2020 01:23
5CR200002063501/10/2020 01:51
6CR200002063501/10/2020 02:20
7CR200002063501/10/2020 02:49
8CR200002063501/10/2020 03:13
9CR200002063501/10/2020 03:44
10CR200002063501/10/2020 04:10
Sheet1

And this is sheet 2:

Test workbook.xlsm
CDE
1SerialTimestampValue to return
2CR200002063401/10/2020 01:2015
3CR200002063401/10/2020 01:4930
4CR200002063501/10/2020 01:2160
5CR200002063501/10/2020 01:4515
6CR200002063501/10/2020 02:1030
7CR200002063501/10/2020 02:3915
8CR200002063501/10/2020 03:0360
9CR200002063501/10/2020 03:4360
10CR200002063501/10/2020 04:0930
Sheet2

So if I looked up the time stamp in B2 on sheet 1, the value I'd expect to return is 15, which is the value from E2 on sheet 2. If I looked up the time stamp in B6 on sheet 1 I'd expect the return value to be 30, from E6 on the 2nd sheet.

Does my explanation make sense or have I confused the hell out of everyone?

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#### sandy666

##### Banned - Rules violations
is that what you want?
 Serial Number Sign Date Serial Timestamp Value to return Serial Number Last V2R CR2000020634 01/10/2020 01:22:59 CR2000020634 01/10/2020 01:20:59 15 CR2000020634 01/10/2020 01:50 30 CR2000020634 01/10/2020 01:50:03 CR2000020634 01/10/2020 01:49:03 30 CR2000020635 01/10/2020 04:10 60 CR2000020635 01/10/2020 01:23:39 CR2000020635 01/10/2020 01:21:39 60 CR2000020635 01/10/2020 01:51:15 CR2000020635 01/10/2020 01:45:15 15 CR2000020635 01/10/2020 02:20:28 CR2000020635 01/10/2020 02:10:28 30 CR2000020635 01/10/2020 02:49:39 CR2000020635 01/10/2020 02:39:39 15 CR2000020635 01/10/2020 03:13:31 CR2000020635 01/10/2020 03:03:31 60 CR2000020635 01/10/2020 03:44:19 CR2000020635 01/10/2020 03:43:19 60 CR2000020635 01/10/2020 04:10:14 CR2000020635 01/10/2020 04:09:14 30

#### Fluff

##### MrExcel MVP, Moderator
Excel Formula:
``=INDEX(Sheet2!\$E\$2:\$E\$10,AGGREGATE(14,6,(ROW(Sheet2!\$D\$2:\$D\$10)-ROW(Sheet2!\$D\$2)+1)/(Sheet2!\$C\$2:\$C\$10=A2)/(Sheet2!\$D\$2:\$D\$10<B2),1))``

#### sharky12345

##### Well-known Member
I'll try both suggestions and come back to you!!

#### sharky12345

##### Well-known Member

is that what you want?
 Serial Number Sign Date Serial Timestamp Value to return Serial Number Last V2R CR2000020634 01/10/2020 01:22:59 CR2000020634 01/10/2020 01:20:59 15 CR2000020634 01/10/2020 01:50 30 CR2000020634 01/10/2020 01:50:03 CR2000020634 01/10/2020 01:49:03 30 CR2000020635 01/10/2020 04:10 60 CR2000020635 01/10/2020 01:23:39 CR2000020635 01/10/2020 01:21:39 60 CR2000020635 01/10/2020 01:51:15 CR2000020635 01/10/2020 01:45:15 15 CR2000020635 01/10/2020 02:20:28 CR2000020635 01/10/2020 02:10:28 30 CR2000020635 01/10/2020 02:49:39 CR2000020635 01/10/2020 02:39:39 15 CR2000020635 01/10/2020 03:13:31 CR2000020635 01/10/2020 03:03:31 60 CR2000020635 01/10/2020 03:44:19 CR2000020635 01/10/2020 03:43:19 60 CR2000020635 01/10/2020 04:10:14 CR2000020635 01/10/2020 04:09:14 30
Sandy666 sorry that doesn't give me what I'd expect...

#### sharky12345

##### Well-known Member
Excel Formula:
``=INDEX(Sheet2!\$E\$2:\$E\$10,AGGREGATE(14,6,(ROW(Sheet2!\$D\$2:\$D\$10)-ROW(Sheet2!\$D\$2)+1)/(Sheet2!\$C\$2:\$C\$10=A2)/(Sheet2!\$D\$2:\$D\$10<B2),1))``
Fluff thanks - is there anything you can think of that would produce a #NUM error?

#### sandy666

##### Banned - Rules violations

Sandy666 sorry that doesn't give me what I'd expect...
so show expected result

#### Fluff

##### MrExcel MVP, Moderator
is there anything you can think of that would produce a #NUM error?
There is no date/time in sheet2 less than the date/time in sheet1 for that serial number.

#### sharky12345

##### Well-known Member
so show expected result
Well in your example, serial number 634 with a sign date of 01/10/2020 01:22:59 should produce 15 because 01:20:59 is the last time.

#### Fluff

##### MrExcel MVP, Moderator
It does
+Fluff v2.xlsm
ABCDE
1SerialTimestampValue to return
2CR200002063401/10/2020 01:2015
3CR200002063401/10/2020 01:4930
4CR200002063501/10/2020 01:2160
5CR200002063501/10/2020 01:4515
6CR200002063501/10/2020 02:1030
7CR200002063501/10/2020 02:3915
8CR200002063501/10/2020 03:0360
9CR200002063501/10/2020 03:4360
10CR200002063501/10/2020 04:0930
11
Sheet2

+Fluff v2.xlsm
ABC
1Serial NumberSign Date
2CR200002063401/10/2020 01:2215
3CR200002063401/10/2020 01:5030
4CR200002063501/10/2020 01:2360
5CR200002063501/10/2020 01:5115
6CR200002063501/10/2020 02:2030
7CR200002063501/10/2020 02:4915
8CR200002063501/10/2020 03:1360
9CR200002063501/10/2020 03:4460
10CR200002063501/10/2020 04:1030
Sheet1
Cell Formulas
RangeFormula
C2:C10C2=INDEX(Sheet2!\$E\$2:\$E\$10,AGGREGATE(14,6,(ROW(Sheet2!\$D\$2:\$D\$10)-ROW(Sheet2!\$D\$2)+1)/(Sheet2!\$C\$2:\$C\$10=A2)/(Sheet2!\$D\$2:\$D\$10<B2),1))

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