v2.3.12

• Add bulgarian language support, translated by yuksbg #234
• Restore Datetime, Date, Time,Timestamp and other structures
• Restore ToDateTimeStruct, ToDateStruct, ToTimeStruct,ToTimestampStruct and other methods

v2.3.11

• Add parsing support for 2006-01-02 15:04:05-0700 MST format in Parse method
• Return the original value instead of returning null when parsing the zero value time 0001-01-01 00:00:00 in Parse method #232
• Optimize the judgment logic in IsValid and IsInvalid methods
• Implement Abs method by itself in DiffAbsInDuration method #226
• Unified unit test format

v2.3.10

• Fixed bug when json.Unmarshaler decoded a json string containing null value
• Add ISO8601ZuluLayout,ISO8601ZuluMilliLayout,ISO8601ZuluMicroLayout,ISO8601ZuluNanoLayout constants
• Add FormattedDateLayout,FormattedDayDateLayout constants
• Add ISO8601ZuluFormat,ISO8601ZuluMilliFormat,ISO8601ZuluMicroFormat,ISO8601ZuluNanoFormat constants
• Add FormattedDateFormat,FormattedDayDateFormat constants
• Add ToIso8601ZuluString,ToIso8601ZuluMilliString,ToIso8601ZuluMicroString,ToIso8601ZuluNanoString methods
• Add ToFormattedDateString,ToFormattedDayDateString methods
• Add GoString method
• Support json strings containing null when using json.Unmarshaler #225
• Remove deprecatedToFormatString method, use Format method instead
• Remove deprecated ToLayoutString method, use Layout method instead

v2.3.9

• Add DiffInDuration and DiffAbsInDuration methods
• Add package comment for calendar/persian
• Simplified code in calendar.go and constellation.go
• Unified Unit Testing Method Naming Format

v2.3.8

• Add support for Persian(Jalaali) Calendar #197
• Add support for Polish language
• Add W3cLayout const in carbon.go file
• Add StdTime method to replace ToStdTime method, ToStdTime method will be deprecated in the future
• Fix ToJulian method in calendar/julian.go file

v2.3.7

• Support julian day and modified julian day #197
• Fix overflow int in windows386 #219
• Remove lunar DoubleHour, IsXXXDoubleHour methods

v2.3.6

• Extract the calendar as an independent sub package
• Add CreateFromLunar method, create a Carbon instance from Lunar date and time
• Fix concurrent map read and map write in ToMonthString, ToShortMonthString,ToWeekString, ToShortWeekString, Season , Constellation methods #180
• Improve unit and benchmark test coverage

v2.3.5

• Default struct add Locale field for setting the global local language
• Add timezone constants
• Add IsAM, IsPM methods
• Add Max, Min methods
• Optimize LoadTag method and replace strings.Contains with strings.HasPrefix
• Improve unit and benchmark test coverage

v2.3.4

• Add Default struct and SetDefault method for setting global default values #215
• Move SetLanguage method from setter.go to language.go
• SetLocale and SetResources methods return *Language
• Improve unit and benchmark coverage

v2.3.3

• Add Hindi language support
• Add Vietnamese language support
• Optimize code
• carbon:"xxx" -> carbon:"type:xxx"