# Determining if a date falls between multiple sets of dates

#### MICHBROWNAOL

##### Board Regular
Is there an easy way to determine if a specific date falls between multiple sets of dates? I'm programming a spreadsheet for my company, and I need to determine if a date falls between a specific set of dates to determine if it falls in high, medium or low season. While this was easy originally with only three sets of dates per season, I now have to have 30 sets of dates available for each season per year (90 possibilities) times 3 years (now up to 270 possiblities). There is a potential of 1500 dates to be evaluated. My 4 meg spreadsheet has now increased to 41 megs by having to add all the additional calculations.

The formula I've used so far is:

where "Grp Accts"!\$E8 is the date to be evaluated, and \$AD\$9 and \$AE\$9 are the starting and ending dates of the period. There are currently 270 formulas to evaluate each date...any thoughts on how to condense this and shrink my workbook size?

### Excel Facts

Format cells as time
Select range and press Ctrl+Shift+2 to format cells as time. (Shift 2 is the @ sign).

#### Oaktree

##### MrExcel MVP
How about listing all 90 dates, then using the MATCH function?

=ISNUMBER(MATCH(A1,B1:B90,0)) will return true if your date is one of the listed dates and false if it is not.

#### MICHBROWNAOL

##### Board Regular
I like the idea, but the periods can be ranges of dates (i.e. Jan 1 to Feb 15, for example), so the match wouldn't work.

#### barry houdini

##### MrExcel MVP
You could make the formula a tiny bit simpler

Are the date ranges overlapping, or do they have gaps between or neither?

#### MICHBROWNAOL

##### Board Regular
There can be gaps between the ranges of dates

#### MICHBROWNAOL

##### Board Regular
but they are never overlapping

#### Oaktree

##### MrExcel MVP
MICHBROWNAOL said:
I like the idea, but the periods can be ranges of dates (i.e. Jan 1 to Feb 15, for example), so the match wouldn't work.

But, you could list each date from Jan 1 to Feb 15 individually...

#### fairwinds

##### MrExcel MVP
Hi,

Try:

=IF(LOOKUP(A2,D2:D10,E2:E10)>=A2,LOOKUP(A2,D2:D10,F2:F10),"No period")
Book1
ABCDEF
1DatePeriodStartEndPeriod
22005-03-27period 32005-01-012005-01-25period 1
32005-02-102005-02-28period 2
42005-03-222005-04-03period 3
52005-05-012005-05-07period 4
62005-06-102005-06-10period 5
Sheet3

#### fairwinds

##### MrExcel MVP
The list of dates must be sorted ascending.

Having zero in AD12:AE12 does not make it so.

Change formula in AE12 to

=IF(Dates!C12,Dates!C12,"")

to eliminate zero values.

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