Power Fx function
Complete A–Z reference
Day
Day number from a date.
What it does
Day number from a date.
The job: Every function, signal, and operator entry in the canvas-apps reference.
How to use Day
Start from the task, not the alphabet. If you are shaping rows for a gallery, reach for Day alongside the other data functions in its group; if you are saving, navigating, or changing state, use it on an event such as a button OnSelect rather than in a display property. When a formula misbehaves, check for a blank value where you expected text, then confirm the behaviour against the examples in the Power Fx function reference hub.
New to the language itself? Read What Is Microsoft Power Fx? first, then come back here when you need this specific tool.
Related functions
DataSourceInfoAsks a data source about itself.DateBuilds a date from year, month, and day.DateAddShifts a date by days, months, or years.DateDiffMeasures the gap between two dates.DateTimeBuilds a date plus time value.DateTimeValueReads date-and-time text into a value.DateValueReads date-only text into a value.Dec2HexNumber rewritten as hexadecimal text.