---
title: unit
framework: storekit
role: symbol
role_heading: Instance Property
path: storekit/product/subscriptionperiod/unit-swift.property
---

# unit

The increment of time for the subscription period.

## Declaration

```swift
let unit: Product.SubscriptionPeriod.Unit
```

## Discussion

Discussion The units used to specify a subscription period include day, week, month, and year, as defined in Product.SubscriptionPeriod.Unit. To calculate the duration of one subscription period, multiply the unit by the number of units (value).

## See Also

### Getting the subscription period

- [value](storekit/product/subscriptionperiod/value.md)
- [Product.SubscriptionPeriod.Unit](storekit/product/subscriptionperiod/unit-swift.enum.md)