Converting UTC Date Time to UNIX Time with Power Automate

Recently Ben Vollmer asked if it was possible to convert a UTC datetime value to Unix time in Power Automate. There’s no function available out of the box to do this, but it seemed pretty achievable to me and I’ve outlined the solution I came up with below.

According to Wikipedia, Unix time is a system for describing a point in time; it is the number of seconds that have elapsed since the Unix epoch, minus leap seconds. the Unix epoch is 00:00:00 UTC on 1 January 1970. Leap seconds are ignored with a leap second having the same Unix time as the second before it, and every day is treated as if it contains exactly 86400 seconds.

Since we know this, we just need to calculate how many seconds have passed between the Unix epoch and the datetime we want to convert.

The Solution

The solution is a single Compose action with the following expression:


As this expression contains a few different functions, I’ve broken it out into separate actions below to explain how it works:

1. Convert Unix Epoch to Ticks representation – as there is no datediff function in Power Automate we need to use the ticks value for our dates to get the time difference between them. The ticks function gives us the 100 nanosecond interval for a specified datetime value.

2. Convert Input timestamps to Ticks representation – just like in the previous step we are converting the value we want to convert to Unix time to it’s ticks representation. In my Flow I’m using a manually triggered flow with a string input field, but you could use the utcNow() function to convert the current datetime or you could use convertToUtc() for a value from an existing data source.

3. Subtract Unix Epoch from Input Timestamp – now that we’ve converted the Unix Epoch and the Input Timestamp to their ticks representations, we subtract the Unix Epoch value from the Input Timestamp value and this will give us the amount of 100- nanosecond intervales that have elapsed between the dates.

4. Divide subtraction result by 1000000 to get Unix Time – As Unix Time is the amount of seconds that have elapsed since the Epoch we divide the 100-nanosecond intervals result by 1000000 to get the Unix Time value.


To make the Flow more efficient and to only use a single action we combine the 4 steps above into a single action to carry out our conversion

Unix time is useful for computer system to track and sort dated information in dynamic and distributed applications both online and client side as it is a point in time that does not change no matter where you are located on the globe.

If you’d like to download a copy of this solution for yourself then click here.

Converting Excel Date Time Serial Values With Power Automate

A common issue I’ve run into and that I’ve heard others experience, is trying to use Excel DateTime values in Power Automate. You will encounter an error like below:

The reason this is an issue is due to the way Excel stores dates and times:

  • Dates are stored as a number representing the number of days since 1900-01-00
  • Times are stored as a fractional portion of a 24 hour day

Thus, an excel datetime value can be represented as ddddd.tttttt

For example, the current date and time is 27 July 2020 15:20:54, which in Excel is represented by the value 44039.63951.

There are a couple of additional caveats to be aware of before we try to convert the dates:

  1. Excel counts 1900-01-01 as day 1 in it’s serial calculation, so you need to ensure you are counting this extra day in any date difference calculations.
  2. The Excel date serial is off by 1, as it behaves as if 1900-02-29 existed. This is due to a compatibility issue with Lotus 123 back when Excel was released and is a known issue (

This means that the Excel date serial for a given day is off by 2 compared to the actual amount of days that have elapsed since 1900-01-01.

The Solution

The solution is a single compose action with the expression:


This expression is a bit of a beast, so I’ve broken it down as follows:

1. Excel DateTime Serial to Float – Excel datetime serials are imported as a string value, so the first thing we need to do is convert it to a Float. For the purposes of this demo I’m using a manually triggered Flow with an input text field that I’m manually populating with the Excel datetime serial, but in a real-world implementation you would replace the triggerbody()[‘text’] value with your Excel date reference.

2. Multiply Float by 86400 – there are 86400 seconds in day, so we’re going to multiply the float value from the previous step by 86400 to calculate the amount of seconds we’re going to be adding later in the Flow.

3. formatNumber to convert Float to String – next we use a formatNumber function to convert the float output from above to a string value. Note, I’m not adding a locale parameter to the formatNumber expression as it defaults to en-US.

4. Convert String to Integer – we need an integer value to use in the addSeconds function, so we use the int function to convert the string value from above.

5. Add Seconds to 1899-30-12 – now that we have the integer value of the amount of seconds to add, we use the addSeconds function to add this to the date 1899-30-12. As indicated above, Excel DateTime serials are off by 2 days due to the caveats I outlined, therefore we add the seconds to 1899-30-12 (instead of 1900-01-01)


For the sake of efficiency we can combine the 5 steps above into a single Compose action using the expression I outlined at the start of the solution:

I was inspired to write this post following a tweet from Craig Porteous.

I iterated over my initial solution to come up with the above, but I am indebted to Jamie McAllister who released a video back in May that covers the same issue, so I’d recommend having a watch of that video at

If you’d like to download a copy of the Power Automate Flow I created for this then click here.

Calculate Quarter for a Date in Power Automate

A common request in my company is for dates to be expressed in relation to the Quarter of the year in which they fall. Using Power Automate there is no native way of calculating this, so in this post I’m demonstrating two different methods to calculate the Quarter from a given input date:

  1. Nested IF Conditions
  2. Filtered Array

Nested IF Conditions

1. Trigger Flow – for the purposes of this demo I’m using a manual trigger with a date input, but of course it will work with any date so the logic can be implemented within a bigger flow

2. Calculate Month Number – the next step is to use a FormatDateTime function to convert the input date to the Month Number. We use the following expression to achieve this

formatdatetime(triggerBody()['date'], 'MM')

3. Calculate Quarter Number – the final step is to use the calculated Month number to work out which Quarter it is in. This is achieved with a set of nested IF conditions. The expression to use for this is:

		equals(outputs('MonthNum'), '01'), 
		equals(outputs('MonthNum'), '02'), 
		equals(outputs('MonthNum'), '03')
			equals(outputs('MonthNum'), '04'), 
			equals(outputs('MonthNum'), '05'), 
			equals(outputs('MonthNum'), '06')
				equals(outputs('MonthNum'), '07'), 
				equals(outputs('MonthNum'), '08'), 
				equals(outputs('MonthNum'), '09')
					equals(outputs('MonthNum'), '10'), 
					equals(outputs('MonthNum'), '11'), 
					equals(outputs('MonthNum'), '12')

Filtered Array

1. Trigger Flow – as in the previous method, I’m using a manual trigger for the Flow with a Date input

2. Calculate Month Number – as in the previous method, the first action is to use a FormatDateTime expression to calculate Month Number from the input date

3. Compose Quarter Array – next we compose an Array that contains the Month Numbers and their related Quarter Number. The Array I used is:

    "Month": "01",
    "Quarter": "Q1"
    "Month": "02",
    "Quarter": "Q1"
    "Month": "03",
    "Quarter": "Q1"
    "Month": "04",
    "Quarter": "Q2"
    "Month": "05",
    "Quarter": "Q2"
    "Month": "06",
    "Quarter": "Q2"
    "Month": "07",
    "Quarter": "Q3"
    "Month": "08",
    "Quarter": "Q3"
    "Month": "09",
    "Quarter": "Q3"
    "Month": "10",
    "Quarter": "Q4"
    "Month": "11",
    "Quarter": "Q4"
    "Month": "12",
    "Quarter": "Q4"

4. Filter Quarter Array – next we use a Filter Array action to find the Array element where the Month Number is equal to the Month Number we calculated in Step 2. If we edit the Filter Array action in Advanced Mode, the expression we use is:

@equals(item()?['month'], outputs('MonthNum'))

5. Compose Quarter – the final step in the Flow is to use a compose action to extract the quarter number from the Array element we returned from the previous step. We do that by using the following expression:



This post should demonstrate that we can use different methods to achieve the same outcomes in Power Automate. If you’d like to download the Flows to test them for yourself then click the links below:

Change a User’s Business Unit and retain their Security Roles using Power Automate

I saw a tweet recently from Linn Zaw Win asking if it was possible to change a Users Business Unit without losing their Security Roles

If you’ve been following my blog you might be aware that I posted a solution to do this using North52 last year, but I wondered whether it would be possible to do this with Power Automate now.

The Setup

As we can’t run pre-validation Flows to retrieve a the prior value when we change a field in D365, we need to add another lookup to the Business Unit entity from the User entity. I’ve creatively called it “New Business Unit” and we’ll be using this as the trigger for our Flow. In my scenario, if you want to change the Business Unit of a User you would select the one you wish to migrate them to by updating this field

The Solution

1. When “New Business Unit” is updated – the Flow trigger is when the “New Business Unit” field is updated, and we set the filter expression to ensure it isn’t triggered when the field equals null (i.e. if the field is cleared)

2. List Existing Security Roles – next we use a List Records action to retrieve the current list of Security Roles applied to the User. We have to use a FetchXML query to retrieve the list Roles; when you apply a Security Role to a User it creates a record in the systemuserroles entity, so we can retrieve the list of applied Roles for a given User by querying across this entity with some link-entity parameters. The FetchXML query we use is:

  <entity name="role" >
    <attribute name="name" />
    <attribute name="businessunitid" />
    <attribute name="roleid" />
    <link-entity name="systemuserroles" from="roleid" to="roleid" >
      <link-entity name="systemuser" from="systemuserid" to="systemuserid" >
          <condition attribute="systemuserid" operator="eq" value="@{triggerOutputs()?['body/systemuserid']}" />

3. Initialize roleFilterCondition – we’re going to use the roles we returned above to find the same roles under the new business unit with another FetchXML query. Before we do that we need to initialize an empty string variable to hold the FetchXML conditions we’ll create

4. Apply to each Existing Role – for each role we returned in step 2 we will append a condition to the roleFilterCondition variable we created in Step 3 in the following format:

<condition attribute="name" operator="eq" value="@{items('Apply_to_each_Existing_Role')?['name']}" />

5. List Roles for New Business Unit – now that we’ve created our FetchXML conditions we’ll use a List Records step to retrieve the Security Roles for the new business unit that we picked for our User. The FetchXML we use for this query is:

  <entity name="role" >
    <attribute name="name" />
    <attribute name="businessunitid" />
    <attribute name="roleid" />
      <condition attribute="businessunitid" operator="eq" value="@{triggerOutputs()?['body/_rm365_newbusinessunit_value']}" />
      <filter type="or" >

6. Update Business Unit – now that we’ve retrieved the new Security Roles we are going to be applying to the User we can change their Business Unit; to do this we use an Update Record action and set the Business Unit to the “New Business Unit” value. Changing the User’s Business Unit will remove their existing security roles.

7. Apply to each New Role – we use another Apply to Each control to iterate through the values we returned in the List Records action in Step 5 above. For each Role we use the Relate Records action. The parameters for the Relate Records action are:

  • Entity Name: Users
  • Item ID: The User value from the trigger
  • Relationship: systemuserroles_association
  • URL: the full resource address for the Security Role

8. Unrelate “New Business Unit” to clear field – the final step in the Flow is to use the Unrelate Records action to clear the “New Business Unit” field so it can be used again in future. The schema is the same as in the Relate Records action, but we’re triggering it on the New Business Unit record


This method will enable you to update Business Units for Users in your organisation and have their Security Roles persist. You could extend this functionality to Teams as well. It is worth noting that this won’t work for Security Roles that are created for specific Business Units, and it may encounter issues if you have duplicate role names, but I think the basic functionality is quite useful. Let me know if you think is handy for you in the comments below!

Calculating ISO 8601 Week Number for Dates in Power Automate

An issue that a lot of users have faced with Power Automate is the inability to find out the ISO 8601 Week Number for a given date; this was raised as an idea in the Power Apps Ideas forum back in 2017, and you can find numerous questions about it on the Power Automate forums, but a lot of the answers I’ve seen are incomplete or are overly complex.

If I was using Excel, I could find out the week number for a date using the ISOWEEKNUM function, so it’s a bit frustrating that I can’t do it this easily in Power Automate. I’m not the kind of person to back down from a challenge though, so I decided to see if I could figure out an easy solution to this problem.

The SOlution

There are a couple of things to be aware of when trying to work out the ISO Week Number:

  1. An ISO week-numbering year will have either 52 or 53 full weeks
  2. The ISO weeks always start on a Monday
  3. The first ISO week of a year is the first week that contains the first Thursday of the Gregorian calendar

The Wikipedia article on ISO Week Dates has some great information if you’re not familiar with it.

Now that we know the key elements of ISO Week Dates, we can get our thinking caps on. I went through a lot of trial and error to work this out, but what I’ve ended up with below is a solution that I’ve tested successfully against over 1,000 randomly generated dates and it has been 100% correct.

1. Manually trigger a flow – to demonstrate the Flow I’m just using a manual trigger with a Date input

2. Compose Start of Week (Monday) – as we know that ISO weeks always start on a Monday, we want to work out the Monday of the week our trigger date is in. Power Automate numbers days of the week beginning from Sunday, where Sunday is 0, Monday is 1, etc. with the dayofweek expression.

To calculate Monday we subtract the dayofweek value of our trigger date minus 1 to get a total amount of days to subtract. As we know a Sunday will be a 0, we also add in an IF condition to set the value to subtract to 6 if the day is a Sunday.

To give an example of this:

Date = 2020-04-29

Dayofweek for Date = 3

3 – 1 = 2

Monday = 2020-04-29 minus 2 days = 2020-04-27

The expression is constructed as follows:

subtractFromTime(triggerBody()['date'], if(equals(dayofweek(triggerBody()['date']),0),6,sub(dayofweek(triggerBody()['date']),1)), 'Day')

3. Compose Thursday – now that we have the Monday value, we want to find out the value for the Thursday in the week of our triggering date. We do this as the first ISO week of the year will always have a Thursday in it, and therefore it’s best to set our calculations from this day. Thursday is always 3 days after Monday, so we just add 3 days to the Monday value with the expression below:


4. Compose ISO Week Number – To calculate the week number, we need to first find out what day of the year the Thursday is on, and we can do that with the dayofyear expression. You would think that you could just divide the value by 7 and get the week number, but its not that simple.

In 2020, the first Thursday was 2nd January which is Day 2 of the year. the integer value of 2/7 is 0 (in integer maths everything after the decimal point is ignored). ISO Week Numbers start at 1, so 0 is an invalid value. You might think we could just add 1 to this value, but this doesn’t work either.

The 1st Thursday of 2016 was January 7th (7th day of the year). The integer value of 7/7 is 1, and if we added 1 to this it would give us a first week of the year as 2, which obviously isn’t correct.

The simplest way to avoid this is to add 6 days to the DayofYear value for our Thursday, then divide the result by 7 to get our integer value.

To see this in action, and continuing our example from above:

Monday = 2020-04-27

Thursday = Monday+3 = 2020-04-30

DayofYear Thursday = 121

121 + 6 = 127

127/7 = 18.142

Integer value of 18.142 = 18

We can therefore say that the date 2020-04-29 is in Week 18 of 2020

The expression is written as:


5. Respond to a PowerApp or Flow – the final step in this Flow is to set a response action with 2 outputs:

  1. Input date – the value that we input to the Flow
  2. Week Number – we will set this as follows:
Week @{outputs('ISO_Week_Number')} of @{formatdatetime(triggerBody()['date'],'yyyy')}


With this Flow I wanted to create a simple solution to calculate the ISO Week Number for any given date, without lots of nested conditions and weird workarounds. I presented it above as a set of 3 compose actions which is easier for debugging and writing the formula, but you could also have the whole expression in a single compose action as below:

div(add(dayofyear(addDays(subtractFromTime(triggerBody()['date'], if(equals(dayofweek(triggerBody()['date']),0),6,sub(dayofweek(triggerBody()['date']),1)), 'Day'),3)),6),7)

If you find this useful, then I’d love to hear from you, so please leave a comment below or contact me on Twitter or LinkedIn.

Dynamics 365 Opportunity Revenue Forecasting – Creating Monthly Forecasts

In my last post I explored how to create a structure and a triggering flow to create Opportunity Revenue Forecasts. In this post I’ll delve into the child flow to create a set of Monthly Revenue Forecasts.

The Solution

1. Manually trigger a flow – as I explained in the last post, when we trigger this child flow we need the following elements from the triggering flow:

  1. Loops – we use the output from the DateDiff calculated field on the opportunity entity, and we’ll use this to work out how many Revenue Forecast records we will be creating
  2. Estimated Close Date
  3. Project End Date
  4. Revenue Per Day
  5. OpportunityID – The GUID for our triggering record, we’ll use this to set the Opportunity lookup field on the Revenue Forecast records we will create
  6. Estimated Revenue

Steps 2-9 – Initialize variables – the next 8 steps in the Flow are to initialize empty variables that we’ll then be setting in each Loop of our Flow. I’ve provided an outline of the Variables below:

Step No.NameTypeNotes
2startOfMonthStringUsed for calculating the first day of the Month
3endOfMonthStringUsed for calculating the last day of the Month
4daysInMonthIntegerUsed for calculating the total number of full days in a month
5workingDaysInMonthIntegerUsed to hold a count of the working days in the month
6monthRevenueFloatUsed for calculating the amount of revenue that is forecast for the month
7cumulativeAmountFloatUsed for calculating the cumulative amount of revenue to date for the forecast
8previousForecastStringUsed to hold the GUID for the forecast created in the previous loop
9loopIndexIntegerUsed to hold a count of which loop we are in for the purposes of identifying the First and Final loops

10. Do Until – The real bones of the logic of this Flow occurs within the Do Until control step. We set the Do Until to run until the value in the loopIndex variable we created above is equal to the value from the Loops input value for the Flow.

Note: the standard limits for a Do Until control are a count of 60 or a timeout of 1 hour. If you expect to create more loops then you may wish to increase these limits (though note there is an upper limit of a count of 5000 loops or a timeout of 30 days –

10A. Increment loopIndex – the first step in the Do Until loop is to use an Increment Variable action to increment the loopIndex variable by 1.

10B. Check if First Loop – the next step in the Do Until loop is a set of nested conditions that first checks if we’re in the First Loop (i.e. loopIndex = 1), if not it then checks if we’re in the Final Loop (i.e. loopIndex = Loops value from trigger), otherwise it carries out the intermediate Loop steps.

In the loops we set the variables we initialised above as follows:

VariableFirst LoopIntermediate LoopFinal Loop
startOfMonthEstimated Close DateFirst Day of MonthFirst Day of Month
endOfMonthLast Day of MonthLast Day of MonthProject End Date
daysInMonthendOfMonthstartOfMonth +1endOfMonthstartOfMonth +1endOfMonthstartOfMonth +1
workingDaysInMonthworkingDays CalculationworkingDays CalculationworkingDays Calculation
monthRevenueworkingDaysInMonth x Revenue Per DayworkingDaysInMonth x Revenue Per DayworkingDaysInMonth x Revenue Per Day
cumulativeAmountmonthRevenueIncrement by monthRevenueIncrement by monthRevenue
previousForecastGUID of created Revenue ForecastGUID of created Revenue ForecastN/A

I’ll run through the steps in the loops below, and call out where there are differences in the First and Final loops as identified in the table above

10A. set startOfMonth – in the first loop we set this to Estimated Close Date from the trigger inputs. In the intermediate and final loops we use an adddays expression to add one day to the endOfMonth variable to set this to the first day of the new month. The expression we use is:

adddays(variables('endOfMonth'), 1)

10B. Compose startOfMonthTicks – in order to calculate the number of days in the Forecast period we need to convert the start date and end date to their ticks representation. For this step we use the following expression:


10C. set endOfMonth – in the Final Loop we set this to the Project End Date from the trigger inputs, and in the First and Intermediate loops we set it to the last day of the Month using the following expression:

addDays(startOfMonth(addToTime(variables('startOfMonth'), 1, 'Month')), -1)

This expression works as follows:

  1. Add one Month to the date from the startOfMonth variable
  2. Use the startOfMonth expression to get the first day of this month
  3. Add -1 days (i.e. subtract one day) to the resulting date to get the end date of the previous month

an example of this in action would be:

startOfMonth = 2020-04-21

addToTime(variables(‘startOfMonth’), 1, ‘Month’) = 2020-05-21

startOfMonth(2020-05-21) = 2020-05-01

addDays(2020-05-01, -1) = 2020-04-30

10D. Compose endOfMonthTicks – as at Step 10B, we need the ticks representation of the endOfMonth date, so we use the following expression:


10E – Set daysInMonth – to calculate the number of full days in the month we subtract the ticks value of the startOfMonth from the ticks value of the endOfMonth, then divide that value by 864000000000 (the number of ticks in a day), then add 1 to the value to give us the inclusive number of full days, using the following expression:

add(div(sub(outputs('Compose_endOfMonthTicks_-_First_Loop'), outputs('Compose_startofMonthTicks_-_First_Loop')), 864000000000),1)

10F – Set workingDaysInMonth – As we calculated the total number of full days in the forecast period in the previous step, we’ll set the workingDaysInMonth variable to this value, and we’ll subtract from it in the next step

10G. WorkingDays Calculation – I covered how we calculate the number of working days from the number of full days in my previous post, so you can read about that by clicking here. I’m using the exact same logic in each loop in this Flow

10H. Set monthRevenue – to set the revenue amount for the Forecast period we multiply the number of Working Days we calculated above by the Revenue Per Day from the input trigger with the following expression:

mul(triggerBody()['number_1'], variables('workingDaysInMonth'))

10I. Set cumulativeAmount – in the First Loop we set the cumulativeAmount to the monthRevenue value from above, whilst in the Intermediate and Final loops we increment the cumulativeAmount by the monthRevenue value

10J. Compose monthTitle – in order to ensure consistency of naming for the Revenue Forecast records we use a formatDateTime expression to create the title for the record:

formatDateTime(variables('startofMonth'), 'MMMM yyyy')

10K. Create Forecast – we use a Create Record action from the Common Data Service (Current Environment) connector to create the Forecast, and input the variables as follows:

10L. Set previousForecast – the last step in the loop is to set the previousForecast variable to the GUID of the record we created in the previous step. This is used to the set the Previous Forecast field on the Forecast we create in the next loop, which maintains the hierarchical link between the records. This step is obviously not required in the Final loop.

Note: if you wanted your flow to be more efficient you could remove the compose steps at 10B, 10D and 10J and just use the expressions directly where the values from those steps are used in 10E and 10K, respectively. I left the compose steps in for debugging and ease of understanding

The overall Loop section of the Flow looks like this:

Note: if you have a situation where you only have a single loop (i.e. the Estimated Close Date and the Project End Date are in the same month), then you could change the expression in the endOfMonth calculation to if(greater(addDays(startOfMonth(addToTime(variables(‘startOfMonth’), 1, ‘Month’)), -1),triggerBody()[‘date_1’]),triggerBody()[‘date_1’],addDays(startOfMonth(addToTime(variables(‘startOfMonth’), 1, ‘Month’)), -1))

11. Respond to a PowerApp or Flow – the final step in any child flow is to respond to the calling Flow. I haven’t set any outputs in this response action, though of course you may choose to if you wish.


Whilst this Flow may look complicated at first, I think it is actually relatively simple in reality. There are 7 main variables in the Flow (plus the loopIndex), and the nested conditions loop through these variables to set them with the expressions to create the Forecasts.

As this relies on a Do Until loop, it is not going to be instantaneous, so this is something to take into consideration if you were designing this for deployment in a production environment. In my testing, creating up to 100 Revenue Forecast records with this Flow typically took somewhere between 5-10 minutes. I’m sure this speed could be improved if you chose to code this in a plugin, but I wanted to demonstrate what could be done within the context of a Flow.