---
title: "Date picker behavior"
slug: "date-picker-behavior"
updated: 2025-05-16T08:41:33Z
published: 2025-05-16T08:41:33Z
canonical: "help.frisbii.com/date-picker-behavior"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.frisbii.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Date picker behavior

#### What to consider when passing a date and times?

#### Timezone

The Frisbii Transform server time is CET / CEST. Regardless of the user language you chose in your profile or the local settings (timezone) of your browser, all the dates in our application are displayed in CET - Central European Time (Europe/Berlin timezone) from October to March and in CEST - Central European Summer Time from March to October, respectively to Daylight Saving Time (DST).

#### Time stamps format

The timestamp is stored in the backend in ISO 8601 format (YYYY-MM-DDTHH:MM:SS.sssssZ ) and thus UTC. The Z at the end of the timestamp marks the time zone as UTC. A German date of e.g. 12.03.2021 00:00 (a.m.) is stored as 2021-03-11T23:00:00.0000000Z. Milliseconds are optional in the transfer.

Therefore, for operations that must be passed at 00:00 CET / CEST (e.g., due to a daily billing precision in the product family), YYYY-MM-DDT23:00:00.0000000Z must be passed via API in winter time and YYYY-MM-DDT22:00:00.0000000Z in summer time.

If a passed timestamp does not contain a time zone, undesired behavior may occur.

#### Date picker behavior

When you set a date, the Europe/Berlin midnight time is considered. When the time is taken into account, it is also influenced by the DST. This applies for example to timestamps as **Today** and **Now**.

**Datetime pickers** adjust the time to the corresponding contract phase start:

Example: a contract includes a phase starting at 26.03 2:01 am CEST.

- If you pick 27.03 in the datepicker, it will return to you 27.03 2:01 am CEST.
- Even in case, you choose 25.03, it will display 25.03 2:01 am CET, even if the 25th of March is not in DST, which would mean only +1h offset from UTC instead of +2h.