Currently serialization is experimental. We will have one serialization assembly for each type of serialization we support which requires separate dependencies; if and when "stock" binary and XML serialization are supported, they will be included within the main Noda Time assembly.

Json.NET: NodaTime.Serialization.JsonNet

Json.NET is supported within the NodaTime.Serialization.JsonNet assembly and the namespace of the same name.

An extension method of ConfigureForNodaTime is provided on both JsonSerializer and JsonSerializerSettings. Alternatively, the NodaConverters type provides public static read-only fields for individual converters. (All converters are immutable.)

Custom converters can be created easily from patterns using NodaPatternConverter.

Supported types and default representations

All default patterns use the invariant culture.

  • Instant: an ISO-8601 pattern extended to handle fractional seconds: yyyy'-'MM'-'dd'T'HH':'mm':'ss.FFFFFFF'Z'
  • LocalDate: ISO-8601 date pattern: yyyy'-'MM'-'dd
  • LocalTime: ISO-8601 time pattern, extended to handle fractional seconds: HH':'mm':'ss.FFFFFFF
  • LocalDateTime: ISO-8601 date/time pattern with no time zone specifier, extended to handle fractional seconds: yyyy'-'MM'-'dd'T'HH':'mm':'ss.FFFFFFF
  • Interval: A compound object of the form { Start: xxx, End: yyy } where xxx and yyy are represented however the serializer sees fit. (Typically using the default representation above.)
  • Offset: general pattern, e.g. +05 or -03:30
  • Period: The round-trip period pattern; NodaConverters.NormalizingIsoPeriodConverter provides a converter using the normalizing ISO-like pattern
  • Duration: TBD
  • ZonedDateTime: TBD
  • DateTimeZone: The ID, as a string


  • Currently only ISO calendars are supported, and handling for negative and non-four-digit years will depend on the appropriate underlying pattern implementation.
  • There's no indication of the time zone provider or its version in the DateTimeZone representation.