Power Query has number of Date and Time functions that convert values to date and time. However I haven’t found a function that converts a timestamp value. Fortunately it is easy to calculate a date time from a timestamp value. In this post I’ll explain an easy way of converting timestamp to date time. To Learn more about Power Query read Power BI online book; from Rookie to Rock Star.
What is Timestamp
Timestamp is a whole number value, which is number of seconds from date 1970-01-01 00:00:00. For example; timestamp 100 means 1970-01-01 00:01:40, or timestamp 86400 means 1970-01-02 00:00:00. So the calculation is easy; We have to add timestamp as seconds to the date/time 1970-01-01 00:00:00.
Power Query Convert Timestamp to Date Time
Once we know what is definition of timestamp, and how to calculate date/time from it; easily we can use #duration(0,0,0,<timestamp value>) to show duration in seconds, and add it to the #datetime(1970,1,1,0,0,0) which is date time 1970-01-01 00:00:00.
So as a result, here is the code to convert timestamp to date time;
Reza Rad is a Microsoft Regional Director, an Author, Trainer, Speaker and Consultant. He has a BSc in Computer engineering; he has more than 20 years’ experience in data analysis, BI, databases, programming, and development mostly on Microsoft technologies. He is a Microsoft Data Platform MVP for nine continuous years (from 2011 till now) for his dedication in Microsoft BI. Reza is an active blogger and co-founder of RADACAD. Reza is also co-founder and co-organizer of Difinity conference in New Zealand.
His articles on different aspects of technologies, especially on MS BI, can be found on his blog: https://radacad.com/blog.
He wrote some books on MS SQL BI and also is writing some others, He was also an active member on online technical forums such as MSDN and Experts-Exchange, and was a moderator of MSDN SQL Server forums, and is an MCP, MCSE, and MCITP of BI. He is the leader of the New Zealand Business Intelligence users group. He is also the author of very popular book Power BI from Rookie to Rock Star, which is free with more than 1700 pages of content and the Power BI Pro Architecture published by Apress.
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3 thoughts on “Power Query; Convert Time Stamp to Date Time”
I’m using “Direct Query mode” and it doesn’t work for me.
In DirectQuery mode, you have to use T-SQL functions to do that, Power Query functions are limited and often doesn’t fold in that mode