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---
mapped_pages:
- https://www.elastic.co/guide/en/elasticsearch/client/curator/current/fe_week_starts_on.html
---
# week_starts_on [fe_week_starts_on]
::::{note}
This setting is only used with the [period](/reference/filtertype_period.md) filtertype<br> when [period_type](/reference/fe_period_type.md) is `relative`.
::::
```yaml
- filtertype: period
source: name
range_from: -1
range_to: -1
timestring: '%Y.%m.%d'
unit: weeks
week_starts_on: sunday
```
The value of this setting indicates whether weeks should be measured starting on `sunday` or `monday`. Though Monday is the ISO standard, Sunday is frequently preferred.
This setting is only used when [unit](/reference/fe_unit.md) is set to `weeks`.
The default value for this setting is `sunday`.
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