# Date Formatter Property Keys Keys used in key-value pairs to discover and specify the value of date formatter properties—used in conjunction with [`CFDateFormatterCopyProperty(_:_:)`](/documentation/CoreFoundation/CFDateFormatterCopyProperty(_:_:)) and [`CFDateFormatterSetProperty(_:_:_:)`](/documentation/CoreFoundation/CFDateFormatterSetProperty(_:_:_:)). ## Discussion The values for these keys are all CFType objects. The specific types for each key are specified above. ## Topics ### Constants [`static let isLenient: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/isLenient) Specifies the lenient property, a CFBoolean object where a true value indicates that the parsing of strings into date or absolute time values will be fuzzy. [`static let timeZone: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/timeZone) Specifies the time zone property, a CFTimeZone object. [`static let calendarName: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/calendarName) Specifies the calendar name, a CFString object. [`static let defaultFormat: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/defaultFormat) The original format string for the formatter (given the date & time style and locale specified at creation). [`static let twoDigitStartDate: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/twoDigitStartDate) Specifies the property representing the date from which two-digit years start, a CFDate object. [`static let defaultDate: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/defaultDate) Specifies the default date property, a CFDate object. [`static let calendar: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/calendar) Specifies the calendar property, a CFCalendar object. [`static let eraSymbols: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/eraSymbols) Specifies the era symbols property, a CFArray of CFString objects. [`static let monthSymbols: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/monthSymbols) Specifies the month symbols property, a CFArray of CFString objects. [`static let shortMonthSymbols: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/shortMonthSymbols) Specifies the short month symbols property, a CFArray of CFString objects. [`static let weekdaySymbols: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/weekdaySymbols) Specifies the weekday symbols property, a CFArray of CFString objects. [`static let shortWeekdaySymbols: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/shortWeekdaySymbols) Specifies the short weekday symbols property, a CFArray of CFString objects. [`static let amSymbol: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/amSymbol) Specifies the AM symbol property, a CFString object. [`static let pmSymbol: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/pmSymbol) Specifies the PM symbol property, a CFString object. [`static let longEraSymbols: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/longEraSymbols) Specifies the long era symbols property, a CFArray of CFString objects. [`static let veryShortMonthSymbols: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/veryShortMonthSymbols) Specifies the very short month symbols property, a CFArray of CFString objects. [`static let standaloneMonthSymbols: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/standaloneMonthSymbols) Specifies the standalone month symbols property, a CFArray of CFString objects. [`static let shortStandaloneMonthSymbols: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/shortStandaloneMonthSymbols) Specifies the short standalone month symbols property, a CFArray of CFString objects. [`static let veryShortStandaloneMonthSymbols: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/veryShortStandaloneMonthSymbols) Specifies the very short standalone month symbols property, a CFArray of CFString objects. [`static let veryShortWeekdaySymbols: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/veryShortWeekdaySymbols) Specifies the very short weekday symbols property, a CFArray of CFString objects. [`static let standaloneWeekdaySymbols: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/standaloneWeekdaySymbols) Specifies the standalone weekday symbols property, a CFArray of CFString objects. [`static let shortStandaloneWeekdaySymbols: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/shortStandaloneWeekdaySymbols) Specifies the short standalone weekday symbols property, a CFArray of CFString objects. [`static let veryShortStandaloneWeekdaySymbols: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/veryShortStandaloneWeekdaySymbols) Specifies the very short standalone weekday symbols property, a CFArray of CFString objects. [`static let quarterSymbols: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/quarterSymbols) Specifies the quarter symbols property, a CFArray of CFString objects. [`static let shortQuarterSymbols: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/shortQuarterSymbols) Specifies the short quarter symbols property, a CFArray of CFString objects. [`static let standaloneQuarterSymbols: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/standaloneQuarterSymbols) Specifies the standalone quarter symbols property, a CFArray of CFString objects. [`static let shortStandaloneQuarterSymbols: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/shortStandaloneQuarterSymbols) Specifies the short standalone quarter symbols property, a CFArray of CFString objects. [`static let gregorianStartDate: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/gregorianStartDate) Specifies the Gregorian start date property, a CFDate object. [`static let doesRelativeDateFormattingKey: CFDateFormatterKey!`](/documentation/CoreFoundation/CFDateFormatterKey/doesRelativeDateFormattingKey) Specifies the relative date formatting property, a CFBoolean object. --- Copyright © 2026 Apple Inc. 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