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## Introduction

If you want to do calculations based on date cells you need to use the DATE, WEEKDAY, YEAR and MONTH functions.

### Calculate second Tuesday of month

`=DATE(year,month,(2*7+1)-WEEKDAY(DATE(year,month,8-DAY(dayoftheweek))))`

dayoftheweek Sunday=1, Monday=2, etc

e.g. second Tuesday of June 2016

A < A function >
1 14/06/2016 =DATE(2016,6,(2*7+1)-WEEKDAY(DATE(2016,6,8-DAY(3))))

### Calculate first Saturday of month using reference cells for year and month values

A B C < C function >
1 2016 06 04/06/2016 =DATE(A1,B1,(1*7+1)-WEEKDAY(DATE(A1,B1,8-DAY(7))))

### Calculate first Saturday of following month using reference cells for year and month values

A B C < C function >
1 2016 06 02/07/2016 =DATE(A1,B1+1,(1*7+1)-WEEKDAY(DATE(A1,B1+1,8-DAY(7))))

When you have a date in cell and in another reference it to add 1, Excel will by default add one day

A B < B function >
1 01/06/2016 02/06/2016 =A1+1

Because the cell number format determines how the cells actual value is presented and not the value of the cell itself, adding +1 to a cell containing simply month and year wouldn’t return following month like you might expect.

A B < B function >
1 June 2016 June 2016 =A1+1

Excel stores cell A1 as 01/06/2016 even though the cell number format applied is mmmm yyyy and therefore A1+1 = 02/06/2016 which is being displayed with same number format rule as June 2016.

A B < B function >
1 June 2016 July 2016 =DATE(YEAR(A1),MONTH(A1)+1,DAY(A1))

A B < B function >
1 June 2016 June 2017 =DATE(YEAR(A1)+1,MONTH(A1),DAY(A1))

## Introduction

If you want to do calculations based on cells containing times you need to use the TIME and TIMEVALUE functions.

### Add 1 hour to time

You can’t simply use =A1+1 to add an hour to a time stored in A1, you need to define which part of the time value – hh:mm:ss – you want to add one to. You must define the value as TIME then use hh,mm,ss options for the value to add

A B < B function >
1 04:00 05:00 =A1+TIME(1,0,0)
2 04:00 04:30 =A2+TIME(0,30,0)

### Show a time range using a cells time as starting point

Use CONCATENATE or & to add free text (“~”) between the time from an existing cell and existing cell +3 hours

A B < B function >
1 04:00 04:00~07:00 =CONCATENATE(TEXT(A1,”hh:mm”),”~”,TEXT(A1+TIME(3,0,0),”hh:mm”))
2 04:00 04:00~07:00 =TEXT(A2,”hh:mm”)&”~”&TEXT(A2+TIME(3,0,0),”hh:mm”)

### If time in cell is less than defined time minus one day

If you want to use time from a reference cell in a function you have to use TIMEVALUE
e.g. if time in column A cell is less than 01:00, take date from column B cell and -1 day, else leave same value as column B cell

A B C < C function >
1 12:30 AM 10/06/2016 09/06/2016 =IF(A1>=TIMEVALUE(“01:00 AM”),B1,B1-1)
2 02:00 AM 10/06/2016 10/06/2016 =IF(A2>=TIMEVALUE(“01:00 AM”),B2,B2-1)
3 01:00 AM 10/06/2016 10/06/2016 =IF(A3>=TIMEVALUE(“01:00 AM”),B3,B3-1)

## Introduction

Using VLOOKUP, NOT & ISNA in a Conditional Formatting rule is a really useful way to show whether a cell’s contents appear in a second data set.

To highlight Sheet1 Column A cells that appear in Sheet2 Column A, select Sheet1 Column A and create a new Conditional Formatting rule using ‘Use a formula to determine which cells to format‘ and use formula:

`=NOT(ISNA(VLOOKUP(A1,Sheet2!\$A:\$A,1,FALSE)))`

A B
1 Ford
2 Lotus
3 BMW
4 Audi
5 Mini
6 Ford

#### Sheet2

A B C D
1 Ford US Escort Red
2 Lotus UK Elise Silver
3 BMW Germany 330 Blue
4 VW Germany Golf Black
5 Ford US Mondeo Silver
6 Mini Cooper

To apply format rule to show non-matches use

`=ISNA(VLOOKUP(A1,Sheet2!\$A:\$A,1,FALSE))`
A B
1 Ford
2 Lotus
3 BMW
4 Audi
5 Mini
6 Ford