---
title: gregorianStartDate
framework: corefoundation
role: symbol
role_heading: Type Property
path: corefoundation/cfdateformatterkey/gregorianstartdate
---

# gregorianStartDate

Specifies the Gregorian start date property, a CFDate object.

## Declaration

```swift
static let gregorianStartDate: CFDateFormatterKey!
```

## Discussion

Discussion This is used to specify the start date for the Gregorian calendar switch from the Julian calendar. Different locales switched at different times. Normally you should just accept the locale’s default date for the switch.

## See Also

### Constants

- [isLenient](corefoundation/cfdateformatterkey/islenient.md)
- [timeZone](corefoundation/cfdateformatterkey/timezone.md)
- [calendarName](corefoundation/cfdateformatterkey/calendarname.md)
- [defaultFormat](corefoundation/cfdateformatterkey/defaultformat.md)
- [twoDigitStartDate](corefoundation/cfdateformatterkey/twodigitstartdate.md)
- [defaultDate](corefoundation/cfdateformatterkey/defaultdate.md)
- [calendar](corefoundation/cfdateformatterkey/calendar.md)
- [eraSymbols](corefoundation/cfdateformatterkey/erasymbols.md)
- [monthSymbols](corefoundation/cfdateformatterkey/monthsymbols.md)
- [shortMonthSymbols](corefoundation/cfdateformatterkey/shortmonthsymbols.md)
- [weekdaySymbols](corefoundation/cfdateformatterkey/weekdaysymbols.md)
- [shortWeekdaySymbols](corefoundation/cfdateformatterkey/shortweekdaysymbols.md)
- [amSymbol](corefoundation/cfdateformatterkey/amsymbol.md)
- [pmSymbol](corefoundation/cfdateformatterkey/pmsymbol.md)
- [longEraSymbols](corefoundation/cfdateformatterkey/longerasymbols.md)