# BT-134 — Invoice line period start date

> https://billhorse.com/en/terms/bt-134/

First day of this line's delivery period (e.g. the billing month of one service). Overrides the document period BG-14 for this line; must not be after BT-135.

## Where does it live in the XML?

- UBL: `cac:InvoiceLine/cac:InvoicePeriod/cbc:StartDate`
- CII: `ram:SpecifiedLineTradeSettlement/ram:BillingSpecifiedPeriod/ram:StartDateTime/udt:DateTimeString`