Returns a zero-based index Number indicating what day is the first day of the country's or region's calendar week: Sunday: 0 Monday: 1 Tuesday: 2 etc.
| Parameter | Type | Description |
|---|---|---|
| options | Object | Additional options for the method. See below. |
options object properties:
| Properties | Type | Description |
|---|---|---|
| countryCode | String | Two letter IETF/ISO 639 code for country/region. Optional. Defaults to device's current locale. |
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