Power Apps: Calculating various dates with date functions

In this article, I will show you how to leverage the DateDiff(), DateAdd(), Weekday(), DateValue(), and Day(), and Today() functions to calculate all sort of dates that are typical to business applications: first and last day of previous month, first and last day of previous quarter, first and last day of previous week, first and last day of current month, first and last day of current quarter, first and last day of current week, first and last day of next month, first and last day of next quarter, first and last day of next week, etc.



Let's begin:

Each calculation is self-contained for convenience sake, which means the only dependency is on the cdt context variable.

Current Date
UpdateContext({cdt:Today()});
Note: you could also use the Now() function, but be aware that this function also includes the timestamp.

First Day of Previous Month
With(
    {rootdate: DateValue("01/01/1900")},
    With(
        {
            mts: DateDiff(
                rootdate,
                cdt,
                Months
            ) - 1
        },
        DateAdd(
            rootdate,
            mts,
            Months
        )
    )
)

Last Day of Previous Month
DateAdd(cdt, -Day(cdt), Days)

First Day of Current Month 
With(
    {rootdate: DateValue("01/01/1900")},
    With(
        {
            mts: DateDiff(
                rootdate,
                cdt,
                Months
            )
        },
        DateAdd(
            rootdate,
            mts,
            Months
        )
    )
)

Last Day of Current Month 
With(
    {rootdate: DateValue("01/01/1900")},
    With(
        {
            mts: DateDiff(
                rootdate,
                cdt,
                Months
            ) + 1
        },
        With(
            {
                FirstNxtMonth: DateAdd(
                    rootdate,
                    mts,
                    Months
                )
            },
            DateAdd(
                FirstNxtMonth,
                -1,
                Days
            )
        )
    )
)

First Day of Next Month 
With(
    {rootdate: DateValue("01/01/1900")},
    With(
        {
            mts: DateDiff(
                rootdate,
                cdt,
                Months
            ) + 1
        },
        DateAdd(
            rootdate,
            mts,
            Months
        )
    )
)

Last Day of Next Month 
With(
    {rootdate: DateValue("01/01/1900")},
    With(
        {
            mts: DateDiff(
                rootdate,
                cdt,
                Months
            ) + 2
        },
        With(
            {
                FirstNxtMonth: DateAdd(
                    rootdate,
                    mts,
                    Months
                )
            },
            DateAdd(
                FirstNxtMonth,
                -1,
                Days
            )
        )
    )
)

First Day of Previous Quarter 
With(
    {rootdate: DateValue("01/01/1900")},
    With(
        {
            qtrs: DateDiff(
                rootdate,
                cdt,
                Quarters
            )
        },
        DateAdd(
            rootdate,
            qtrs - 1,
            Quarters
        )
    )
)

Last Day of Previous Quarter 
With(
    {rootdate: DateValue("01/01/1900")},
    With(
        {
            qrtr: DateDiff(
                rootdate,
                cdt,
                Quarters
            )
        },
        With(
            {
                NxtQrtr: DateAdd(
                    rootdate,
                    qrtr,
                    Quarters
                )
            },
            DateAdd(
                NxtQrtr,
                -1,
                Days
            )
        )
    )
)

First Day of Current Quarter 
With(
    {rootdate: DateValue("01/01/1900")},
    With(
        {
            qtrs: DateDiff(
                rootdate,
                cdt,
                Quarters
            )
        },
        DateAdd(
            rootdate,
            qtrs,
            Quarters
        )
    )
)

Last Day of Current Quarter 
With(
    {rootdate: DateValue("01/01/1900")},
    With(
        {
            qrtr: DateDiff(
                rootdate,
                cdt,
                Quarters
            ) + 1
        },
        With(
            {
                NxtQrtr: DateAdd(
                    rootdate,
                    qrtr,
                    Quarters
                )
            },
            DateAdd(
                NxtQrtr,
                -1,
                Days
            )
        )
    )
)

First Day of Next Quarter 
With(
    {rootdate: DateValue("01/01/1900")},
    With(
        {
            qrtr: DateDiff(
                rootdate,
                cdt,
                Quarters
            ) + 1
        },
        With(
            {
                NxtQrtr: DateAdd(
                    rootdate,
                    qrtr,
                    Quarters
                )
            },
            DateAdd(
                NxtQrtr,
                0,
                Days
            )
        )
    )
)

Last Day of Next Quarter 
With(
    {rootdate: DateValue("01/01/1900")},
    With(
        {
            qrtr: DateDiff(
                rootdate,
                cdt,
                Quarters
            ) + 2
        },
        With(
            {
                NxtQrtr: DateAdd(
                    rootdate,
                    qrtr,
                    Quarters
                )
            },
            DateAdd(
                NxtQrtr,
                -1,
                Days
            )
        )
    )
)

First Day of Previous Week 
With(
    {rootdate: DateValue("01/01/1900")},
    With(
        {
            diffval: DateDiff(
                rootdate,
                cdt,
                Days
            ),
            Offset: 1 - Weekday(cdt)
        },
        DateAdd(
            cdt,
            Offset - 7,
            Days
        )
    )
)

Last Day of Previous Week 
With(
    {rootdate: DateValue("01/01/1900")},
    With(
        {
            diffval: DateDiff(
                rootdate,
                cdt,
                Days
            ),
            Offset: 1 - Weekday(cdt)
        },
        DateAdd(
            cdt,
            Offset - 1,
            Days
        )
    )
)

First Day of Current Week 
With(
    {rootdate: DateValue("01/01/1900")},
    With(
        {
            diffval: DateDiff(
                rootdate,
                cdt,
                Days
            ),
            Offset: 1 - Weekday(cdt)
        },
        DateAdd(
            cdt,
            Offset,
            Days
        )
    )
)

Last Day of Current Week 
With(
    {rootdate: DateValue("01/01/1900")},
    With(
        {
            diffval: DateDiff(
                rootdate,
                cdt,
                Days
            ),
            Offset: 1 - Weekday(cdt)
        },
        DateAdd(
            cdt,
            Offset + 6,
            Days
        )
    )
)

First Day of Next Week 
With(
    {rootdate: DateValue("01/01/1900")},
    With(
        {
            diffval: DateDiff(
                rootdate,
                cdt,
                Days
            ),
            Offset: 1 - Weekday(cdt)
        },
        DateAdd(
            cdt,
            Offset + 7,
            Days
        )
    )
)

Last Day of Next Week 
With(
    {rootdate: DateValue("01/01/1900")},
    With(
        {
            diffval: DateDiff(
                rootdate,
                cdt,
                Days
            ),
            Offset: 1 - Weekday(cdt)
        },
        DateAdd(
            cdt,
            Offset + 13,
            Days
        )
    )
)

You can download the application on the Power Apps Community apps gallery

To check out my YouTube channel visit: https://youtube.com/user/mgomezb1
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Until next post!

MG.-
Mariano Gomez, MVP

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