---
title: "What date formats are accepted?"
slug: "what-date-formats-are-accepted"
updated: 2024-08-19T11:39:29Z
published: 2024-08-19T11:39:29Z
canonical: "support.lusid.com/what-date-formats-are-accepted"
---

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

# What date formats are accepted?

To avoid any confusion around parsing of dates/times, LUSID expects all timestamps to be in the standard format documented by the W3C [here](https://www.w3.org/TR/NOTE-datetime). This format includes the date followed by a time with precision down to 6 decimal places in the seconds field.

Dates are primarily used in LUSID in the [AsAt](/v1/docs/what-is-the-asat-timestamp) and [EffectiveAt/EffectiveFrom](/v1/docs/what-are-the-effectiveat-and-effectivefrom-timestamps) fields ([cut labels](/v1/docs/what-is-a-cut-label) can also be used when specifying an EffectiveAt date).

Examples of valid formats are

- YYYY-MM-DD, eg 2021-03-01
- YYYY-MM-DDThh:mmZ, eg 2021-03-01T10:01Z
- YYYY-MM-DDThh:mm:ssZ, eg 2021-03-01T10:01:30Z
- YYYY-MM-DDThh:mm:ss.sZ, eg 2021-03-01T10:01:30.1234567Z

LUSID stores all dates/times in ISO UTC format.