Glide path using from to date in data

Hi easton16 ,

You can refer the content in the following links to get it.

Measure to count active employees in a period based on Slicer Calendar

Count of Active Users In date range

Calculate OPEN CASES over time in Power BI

1. Have a date dimension table first

2. Create a measure as below

Employee Count = 
VAR __DATE = MAX ( 'Date'[Date] )
RETURN
    SUMX (
        EmployeeTable,
        IF (
            EmployeeTable[DateStarted] <= __DATE
                && OR ( EmployeeTable[Leavedates] >= __DATE , ISBLANK(EmployeeTable[Leavedates]) ),
            1,
            BLANK ()
        )
    )

3. Create visual

Best Regards