# periodToDateMinOverTime

The periodToDateMinOverTime function calculates the minimum of a measure for a given time granularity (for instance, a quarter) up to a point in time.

## Syntax

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`periodToDateMinOverTime(`

measure,

dateTime,

period)

## Arguments

measure

An aggregated measure that you want to do the calculation

dateTime

The date dimension over which you're computer PeriodOverTime calculations.

period

(Optional) The time period across which you're computing the computation. Granularity of YEAR means YearToDate computation, Quarter means QuarterToDate, and so on. Valid granularities include YEAR, QUARTER, MONTH, WEEK, DAY, HOUR, MINUTE, and SECONDS.

The default value is the visual's date dimension granularity.

## Example

The following example calculates the minimum fare amount month over month.

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`periodToDateMinOverTime(min({fare_amount}), pickupDatetime, MONTH)`