CalendarSystem Coptic Property Noda Time

[This is preliminary documentation and is subject to change.]

Returns a Coptic calendar system, which defines every fourth year as leap, much like the Julian calendar. The year is broken down into 12 months, each 30 days in length. An extra period at the end of the year is either 5 or 6 days in length. In this implementation, it is considered a 13th month.

Namespace: NodaTime
Assembly: NodaTime (in NodaTime.dll) Version: (

public static CalendarSystem Coptic { get; }

Property Value

Type: CalendarSystem
A suitable Coptic calendar reference; the same reference may be returned by several calls as the object is immutable and thread-safe.

Year 1 in the Coptic calendar began on August 29, 284 CE (Julian), thus Coptic years do not begin at the same time as Julian years. This calendar is not proleptic, as it does not allow dates before the first Coptic year.

This implementation defines a day as midnight to midnight exactly as per the ISO calendar. Some references indicate that a Coptic day starts at sunset on the previous ISO day, but this has not been confirmed and is not implemented.

This calendar always has at least 4 days in the first week of the week-year.

Version Information

Available since: 2.0.0
Supported in the PCL? Yes
See Also