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This blog will show how to work with Epoch format in both seconds and milliseconds in Power Query. You can use the formulas shown in both Excel und Power BI.
From DateTime format to Epoch
Convert the date column into a DateTime zone column:
Add a calculated column referring to your date column:
Formulas to use
Seconds:
Number.ToText(Duration.TotalSeconds([Date]-#datetimezone(1970,1,1,0,0,0,0,0)))
Milliseconds:
Number.ToText(Duration.TotalSeconds([Date]-#datetimezone(1970,1,1,0,0,0,0,0))*1000)
Replace [Date] by the column that has your date.
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From Epoch to DateTime
We will start with this Epoch value and we want to convert it to DateTime format:
Formulas to use
Seconds:
#datetimezone(1970,1,1,0,0,0,0,0) + #duration(0,0,0,Number.From([Epoch]))
Milliseconds:
#datetimezone(1970,1,1,0,0,0,0,0) + #duration(0,0,0,Number.From([Epoch])/1000)
Replace [Epoch] by the column that has your date.
