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The implementation of the Persian (Solar Hijri) Calendar in Go (golang)
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CodeLingoBot and yaa110 Fix function comments based on best practices from Effective Go
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Go Persian Calendar

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Go Persian Calendar provides functionality for conversion among Persian (Solar Hijri) and Gregorian calendars. A Julian calendar is used as an interface for all conversions. The package name is ptime and it is compatible with the package time. All months are available with both Iranian and Dari Persian names. This source code is licensed under MIT license that can be found in the LICENSE file.


This assumes you're using go modules, and have set up your go.mod file, possibly using go mod init.

  • Import it in your code:
import ptime
  • Building using go build will now automatically get go-persian-calendar and update your go.mod



  • Refactor code


  • Change module import name


  • Use Go modules


  • ptime.Iran and ptime.Afghanistan changed to ptime.Iran() and ptime.Afghanistan(), respectively.

Getting started

1- Import the package ptime. Most of the time you need to import time and fmt packages, too.

import (
    ptime ""

2- Convert Gregorian calendar to Persian calendar.

// Create a new instance of time.Time
var t time.Time = time.Date(2016, time.January, 1, 12, 1, 1, 0, ptime.Iran())

// Get a new instance of ptime.Time using time.Time
pt := ptime.New(t)

// Get the date in Persian calendar
fmt.Println(pt.Date()) // output: 1394 دی 11

3- Convert Persian calendar to Gregorian calendar.

// Create a new instance of ptime.Time
var pt ptime.Time = ptime.Date(1394, ptime.Mehr, 2, 12, 59, 59, 0, ptime.Iran())

// Get a new instance of time.Time
t := pt.Time()

// Get the date in Gregorian calendar
fmt.Println(t.Date()) // output: 2015 September 24

4- Get the current time.

// Get a new instance of ptime.Time representing the current time
pt := ptime.Now(ptime.Iran())

// Get year, month, day
fmt.Println(pt.Date()) // output: 1394 بهمن 11
fmt.Println(pt.Year(), pt.Month(), pt.Day()) // output: 1394 بهمن 11

// Get hour, minute, second
fmt.Println(pt.Clock()) // output: 21 54 30
fmt.Println(pt.Hour(), pt.Minute(), pt.Second()) // output: 21 54 30

// Get Unix timestamp (the number of seconds since January 1, 1970 UTC)
fmt.Println(pt.Unix()) // output: 1454277270

// Get yesterday, today and tomorrow
fmt.Println(pt.Yesterday().Weekday()) // output: شنبه
fmt.Println(pt.Weekday()) // output: یک‌شنبه
fmt.Println(pt.Tomorrow().Weekday()) // output: دوشنبه

// Get First and last day of week
fmt.Println(pt.FirstWeekDay().Date()) // output: 1394 بهمن 10
fmt.Println(pt.LastWeekday().Date()) // output: 1394 بهمن 16

// Get First and last day of month
fmt.Println(pt.FirstMonthDay().Weekday()) // output: پنج‌شنبه
fmt.Println(pt.LastMonthDay().Weekday()) // output: جمعه

// Get First and last day of year
fmt.Println(pt.FirstYearDay().Weekday()) // output: شنبه
fmt.Println(pt.LastYearDay().Weekday()) // output: شنبه

// Get the week of month
fmt.Println(pt.MonthWeek()) // output: 3

// Get the week of year
fmt.Println(pt.YearWeek()) // output: 46

// Get the number of remaining weeks of the year
fmt.Println(pt.RYearWeek()) // output: 6

5- Format the time.

// Get a new instance of ptime.Time using Unix timestamp
pt := ptime.Unix(1454277270, 0, ptime.Iran())

pt.Format("yyyy/MM/dd E hh:mm:ss a") // output: 1394/11/11 یک‌شنبه 09:54:30 ب.ظ

// yyyy, yyy, y     year (e.g. 1394)
// yy               2-digits representation of year (e.g. 94)
// MMM              the Persian name of month (e.g. فروردین)
// MMI              the Dari name of month (e.g. حمل)
// MM               2-digits representation of month (e.g. 01)
// M                month (e.g. 1)
// rw               remaining weeks of year
// w                week of year
// W                week of month
// RD               remaining days of year
// D                day of year
// rd               remaining days of month
// dd               2-digits representation of day (e.g. 01)
// d                day (e.g. 1)
// E                the Persian name of weekday (e.g. شنبه)
// e                the Persian short name of weekday (e.g. ش)
// A                the Persian name of 12-Hour marker (e.g. قبل از ظهر)
// a                the Persian short name of 12-Hour marker (e.g. ق.ظ)
// HH               2-digits representation of hour [00-23]
// H                hour [0-23]
// kk               2-digits representation of hour [01-24]
// k                hour [1-24]
// hh               2-digits representation of hour [01-12]
// h                hour [1-12]
// KK               2-digits representation of hour [00-11]
// K                hour [0-11]
// mm               2-digits representation of minute [00-59]
// m                minute [0-59]
// ss               2-digits representation of seconds [00-59]
// s                seconds [0-59]
// ns               nanoseconds
// S                3-digits representation of milliseconds (e.g. 001)
// z                the name of location
// Z                zone offset (e.g. +03:30)


Use GoDoc documentation for more information about methods and functionality available for ptime.Time, ptime.Month, ptime.Weekday and ptime.AmPm.

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