---
title: "One-way sync of start/end date"
canonical: "https://support.appfire.com/space/BPEdc/2533918282/One-way%20sync%20of%20start%2Fend%20date"
format: markdown
---
## About the one-way sync of Start/End date fields

> ℹ️ Refer to the [https://appfire.atlassian.net/wiki/spaces/BPEdc/pages/2534901548](https://appfire.atlassian.net/wiki/spaces/BPEdc/pages/2534901548) page for more information.

The start and end date fields can be mapped and unidirectionally synchronized with an additional Jira field. This will result in a one-way data sync from BigPicture to Jira.

## Access the one-way sync fields

To see a one-way sync field, change the start/end date field mapping to a time tracking field and save the changes. A corresponding one-way sync field will appear.

The **one-way sync start date field** is visible only when:

- start date field is synchronized with the **Original Estimate **field.

The **one-way sync end date field** is visible only when:

- The end date field is synchronized with the **Original Estimate** field.
- or, the end date field is synchronized with the  **Time Spent + Remaining Estimate **fields.

![Field mapping settings in BigPicture for one-way sync.](media://7ea1c80e-b13d-4c5b-bf3b-811de8eccce0)

## Configure the Start/End date one-way sync

The one-way sync from BigPicture to Jira does not disrupt the functioning of the Start/End date fields. 

First, configure the standard field mapping for the Start/End date. For example, you can map the BigPicture Start date to the Jira Start date and the BigPicture End date to Jira Time Spent + Remaining Estimate.

Then, map the BigPicture one-way sync end date field with another Jira field, such as the Jira Due date.

> ℹ️ - The one-way sync mapping follows the same rules as the standard (bi-directional) field mapping, meaning you **cannot select the same field** for both the End Date and the one-way sync End Date.
> ℹ️ - Only simple date and time fields can be selected for the one-way sync mapping. Fields such as Time Spent and Remaining Estimate are not available.

![Once way sync example.](media://f223ada3-7da0-4254-8b9b-19658a9a52b3)

This will result in the following:

- The tasks' end dates in BigPicture are based on Jira’s Time Spent + Remaining Estimate.
- BigPicture updates the tasks' end dates and visualizes them on the timeline based on those settings.
- BigPicture updates the Due date field value in Jira based on the End date field value.

Such synchronization is uni-directional, so changing the Due date in Jira does not change the end date in BigPicture.