## Tag Archives: Algorithm

### Algorithm for Nepali date conversion

If you are looking for code to put in your website visit http://nepalidateconve.sourceforge.net/ to download php code.

The codes

Nepali date conversion consists of two parts

A. Data of number of days that occur in each month in each year. This is the reason why all the Nepali date conversion programs have its limitations

B. Algorithm to convert the date from AD to BS or vice versa.

This is explained with the code in VBA (in Excel) below with the required steps.

1. Open MS Excel

2. Open Visual Basic editor (short cut Alt + F11)

3. Insert a class module

4. Rename the class module to Nepali_Calender in Properties window (F4)

5. Paste the code 1 given at the end of this article

6. Insert a Module (normal module not class module!) and Paste the code 2 . It consists of two functions :

a. nepaliToEnglish(y,m,d,formateCode)

b. englishToNepali(y,m,d,formateCode)

where y,m,d=year, month and day and formate code will display the desired output format

 Formate code Formate 0 20671/25 1 2067-Mangsir-25 2 2067-Mangsir-25-Saturday

7. Now close the editor

8. Save your file as *.xlsm (macro enabled)

9. Now you can use two functions made in step 6

10. To make these functions available to all the worksheets

a. save this sheet as add-ins *.xlam format

b. then enable it at Excel Options>Add in>Manage

c. the function will be available as user defined function under Insert functions

11. . In this code the limits are

b. BS 2000-2089

c. if date is out of range then output is string “Out of range”

If you are looking for code to put in your website visit http://nepalidateconve.sourceforge.net/ to download php code.

Code1

Option Explicit

‘the original sorce code of this program is found in sourceforge.net

‘the code in php was translated to VBA

‘this add-in is copyfree and can be distributed freely in multiple copies

‘the user should be responsible for the use of this add in

‘the author is not liable for any damage that may occur by using this add-in

‘modification to the code is welcome. Any additional data in the code if notified over the internet will be usefull to all

‘***********************************************************************************************************

‘*******currently can only calculate the date between BS 2000-2089 and AD 1944-2033*************************

‘***********************************************************************************************************

‘Coder: Nirmal Raj Joshi

‘@copyfree nirmaljoshi.com.np,2010

‘joshi.amn@gmail.com

Private bs As Variant

Public nep_date As Dictionary

Public eng_date As Dictionary

Public debug_info

Sub initilizeClass()

ReDim bs(90)

bs(0) = Array(2000, 30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31)

bs(1) = Array(2001, 31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30)

bs(2) = Array(2002, 31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30)

bs(3) = Array(2003, 31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31)

bs(4) = Array(2004, 30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31)

bs(5) = Array(2005, 31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30)

bs(6) = Array(2006, 31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30)

bs(7) = Array(2007, 31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31)

bs(8) = Array(2008, 31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 29, 31)

bs(9) = Array(2009, 31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30)

bs(10) = Array(2010, 31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30)

bs(11) = Array(2011, 31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31)

bs(12) = Array(2012, 31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 30, 30)

bs(13) = Array(2013, 31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30)

bs(14) = Array(2014, 31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30)

bs(15) = Array(2015, 31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31)

bs(16) = Array(2016, 31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 30, 30)

bs(17) = Array(2017, 31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30)

bs(18) = Array(2018, 31, 32, 31, 32, 31, 30, 30, 29, 30, 29, 30, 30)

bs(19) = Array(2019, 31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31)

bs(20) = Array(2020, 31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30)

bs(21) = Array(2021, 31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30)

bs(22) = Array(2022, 31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 30)

bs(23) = Array(2023, 31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31)

bs(24) = Array(2024, 31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30)

bs(25) = Array(2025, 31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30)

bs(26) = Array(2026, 31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31)

bs(27) = Array(2027, 30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31)

bs(28) = Array(2028, 31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30)

bs(29) = Array(2029, 31, 31, 32, 31, 32, 30, 30, 29, 30, 29, 30, 30)

bs(30) = Array(2030, 31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31)

bs(31) = Array(2031, 30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31)

bs(32) = Array(2032, 31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30)

bs(33) = Array(2033, 31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30)

bs(34) = Array(2034, 31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31)

bs(35) = Array(2035, 30, 32, 31, 32, 31, 31, 29, 30, 30, 29, 29, 31)

bs(36) = Array(2036, 31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30)

bs(37) = Array(2037, 31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30)

bs(38) = Array(2038, 31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31)

bs(39) = Array(2039, 31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 30, 30)

bs(40) = Array(2040, 31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30)

bs(41) = Array(2041, 31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30)

bs(42) = Array(2042, 31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31)

bs(43) = Array(2043, 31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 30, 30)

bs(44) = Array(2044, 31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30)

bs(45) = Array(2045, 31, 32, 31, 32, 31, 30, 30, 29, 30, 29, 30, 30)

bs(46) = Array(2046, 31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31)

bs(47) = Array(2047, 31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30)

bs(48) = Array(2048, 31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30)

bs(49) = Array(2049, 31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 30)

bs(50) = Array(2050, 31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31)

bs(51) = Array(2051, 31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30)

bs(52) = Array(2052, 31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30)

bs(53) = Array(2053, 31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 30)

bs(54) = Array(2054, 31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31)

bs(55) = Array(2055, 31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30)

bs(56) = Array(2056, 31, 31, 32, 31, 32, 30, 30, 29, 30, 29, 30, 30)

bs(57) = Array(2057, 31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31)

bs(58) = Array(2058, 30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31)

bs(59) = Array(2059, 31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30)

bs(60) = Array(2060, 31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30)

bs(61) = Array(2061, 31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31)

bs(62) = Array(2062, 30, 32, 31, 32, 31, 31, 29, 30, 29, 30, 29, 31)

bs(63) = Array(2063, 31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30)

bs(64) = Array(2064, 31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30)

bs(65) = Array(2065, 31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31)

bs(66) = Array(2066, 31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 29, 31)

bs(67) = Array(2067, 31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30)

bs(68) = Array(2068, 31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30)

bs(69) = Array(2069, 31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31)

bs(70) = Array(2070, 31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 30, 30)

bs(71) = Array(2071, 31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30)

bs(72) = Array(2072, 31, 32, 31, 32, 31, 30, 30, 29, 30, 29, 30, 30)

bs(73) = Array(2073, 31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31)

bs(74) = Array(2074, 31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30)

bs(75) = Array(2075, 31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30)

bs(76) = Array(2076, 31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 30)

bs(77) = Array(2077, 31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31)

bs(78) = Array(2078, 31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30)

bs(79) = Array(2079, 31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30)

bs(80) = Array(2080, 31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 30)

bs(81) = Array(2081, 31, 31, 32, 32, 31, 30, 30, 30, 29, 30, 30, 30)

bs(82) = Array(2082, 30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 30, 30)

bs(83) = Array(2083, 31, 31, 32, 31, 31, 30, 30, 30, 29, 30, 30, 30)

bs(84) = Array(2084, 31, 31, 32, 31, 31, 30, 30, 30, 29, 30, 30, 30)

bs(85) = Array(2085, 31, 32, 31, 32, 30, 31, 30, 30, 29, 30, 30, 30)

bs(86) = Array(2086, 30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 30, 30)

bs(87) = Array(2087, 31, 31, 32, 31, 31, 31, 30, 30, 29, 30, 30, 30)

bs(88) = Array(2088, 30, 31, 32, 32, 30, 31, 30, 30, 29, 30, 30, 30)

bs(89) = Array(2089, 30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 30, 30)

bs(90) = Array(2090, 30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 30, 30)

Set nep_date = New Dictionary

Set eng_date = New Dictionary

End Sub

‘ /**

‘ * Calculates wheather english year is leap year or not

‘ *

‘ * @param integer \$year

‘ * @return boolean

‘ */’

Public Function is_leap_year(year) As Boolean

Dim a, returnVal

a = year

If a Mod 100 = 0 Then

If a Mod 400 = 0 Then

returnVal = True

Else

returnVal = False

End If

Else

If a Mod 4 = 0 Then

returnVal = True

Else

returnVal = False

End If

End If

is_leap_year = returnVal

End Function

Public Function get_nepali_month(m)

Dim n_month

n_month = False

Select Case m

Case 1:

n_month = “Baishak”

Case 2:

n_month = “Jestha”

Case 3:

Case 4:

n_month = “Shrawn”

Case 5:

Case 6:

n_month = “Ashwin”

Case 7:

n_month = “Kartik”

Case 8:

n_month = “Mangshir”

Case 9:

n_month = “Poush”

Case 10:

n_month = “Magh”

Case 11:

n_month = “Falgun”

Case 12:

n_month = “Chaitra”

End Select

get_nepali_month = n_month

End Function

Public Function get_english_month(m)

Dim eMonth

eMonth = False

Select Case m

Case 1

eMonth = “January”

Case 2:

eMonth = “February”

Case 3:

eMonth = “March”

Case 4:

eMonth = “April”

Case 5:

eMonth = “May”

Case 6:

eMonth = “June”

Case 7:

eMonth = “July”

Case 8:

eMonth = “August”

Case 9:

eMonth = “September”

Case 10:

eMonth = “October”

Case 11:

eMonth = “November”

Case 12:

eMonth = “December”

End Select

get_english_month = eMonth

End Function

Public Function get_day_of_week(d)

Dim day

day = False

Select Case d

Case 1:

day = “Sunday”

Case 2:

day = “Monday”

Case 3:

day = “Tuesday”

Case 4:

day = “Wednesday”

Case 5:

day = “Thursday”

Case 6:

day = “Friday”

Case 7:

day = “Saturday”

End Select

get_day_of_week = day

End Function

Public Function is_range_eng(yy, mm, dd)

Dim returnVal

returnVal = True

If (yy < 1944 Or yy > 2033) Then

debug_info = “Supported only between 1944-2022”

returnVal = False

End If

If (mm < 1 Or mm > 12) Then

debug_info = “Error! value 1-12 only”

returnVal = False

End If

If (dd < 1 Or dd > 31) Then

debug_info = “Error! value 1-31 only”

returnVal = False

End If

is_range_eng = returnVal

End Function

Public Function is_range_nep(yy, mm, dd)

Dim returnVal

returnVal = True

If (yy < 2000 Or yy > 2089) Then

debug_info = “Supported only between 2000-2089”

returnVal = False

End If

If (mm < 1 Or mm > 12) Then

debug_info = “Error! value 1-12 only”

returnVal = False

End If

If (dd < 1 Or dd > 32) Then

debug_info = “Error! value 1-31 only”

returnVal = False

End If

is_range_nep = returnVal

End Function

‘ /**

‘ * currently can only calculate the date between AD 1944-2033…

‘ *

‘ * @param unknown_type \$yy

‘ * @param unknown_type \$mm

‘ * @param unknown_type \$dd

‘ * @return unknown

‘ */

Public Sub eng_to_nep(yy, mm, dd)

If (is_range_eng(yy, mm, dd) = False) Then

debug_info = “Out of range”

Else

‘ // english month data.

Dim month, lmonth

month = Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31)

lmonth = Array(31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31)

Dim def_eyy, def_nyy, def_nmm, def_ndd

Dim total_eDays, total_nDays, a, day

Dim m, y, i, j

Dim numDay

def_eyy = 1944 ‘ //spear head english date…

def_nyy = 2000: def_nmm = 9: def_ndd = 17 – 1 ‘ //spear head nepali date…

total_eDays = 0: total_nDays = 0: a = 0: day = 7 – 1 ‘ //all the initializations…

m = 0: y = 0: i = 0: j = 0

numDay = 0

‘// count total no. of days in-terms of year

For i = 0 To yy – def_eyy – 1 ‘ //total days for month calculation…(english)

If (is_leap_year(def_eyy + i) = True) Then

For j = 0 To 12 – 1

total_eDays = total_eDays + lmonth(j)

Next j

Else

For j = 0 To 12 – 1

total_eDays = total_eDays + month(j)

Next j

End If

Next i

‘// count total no. of days in-terms of month

For i = 0 To (mm – 1) – 1

If (is_leap_year(yy) = True) Then

total_eDays = total_eDays + lmonth(i)

Else

total_eDays = total_eDays + month(i)

End If

Next i

‘ // count total no. of days in-terms of date

total_eDays = total_eDays + dd

i = 0: j = def_nmm

total_nDays = def_ndd

m = def_nmm

y = def_nyy

‘// count nepali date from array

Do While (total_eDays <> 0)

a = bs(i)(j)

total_nDays = total_nDays + 1 ‘ //count the days

day = day + 1 ‘ //count the days interms of 7 days

If (total_nDays > a) Then

m = m + 1

total_nDays = 1

j = j + 1

End If

If (day > 7) Then

day = 1

End If

If (m > 12) Then

y = y + 1

m = 1

End If

If (j > 12) Then

j = 1: i = i + 1

End If

total_eDays = total_eDays – 1

Loop

numDay = day

nep_date(“year”) = y

nep_date(“month”) = m

nep_date(“date”) = total_nDays

nep_date(“day”) = get_day_of_week(day)

nep_date(“nmonth”) = get_nepali_month(m)

nep_date(“num_day”) = numDay

End If

End Sub

‘ /**

‘ * currently can only calculate the date between BS 2000-2089

‘ *

‘ * @param unknown_type \$yy

‘ * @param unknown_type \$mm

‘ * @param unknown_type \$dd

‘ * @return unknown

‘ */

Public Sub nep_to_eng(yy, mm, dd)

Dim def_eyy, def_emm, def_edd

Dim def_nyy, def_nmm, def_ndd

Dim total_eDays, total_nDays, a, day

Dim m, y, i, j

Dim k, numDay

Dim month, lmonth

def_eyy = 1943: def_emm = 4: def_edd = 14 – 1 ‘// init english date.

def_nyy = 2000: def_nmm = 1: def_ndd = 1 ‘ // equivalent nepali date.

total_eDays = 0: total_nDays = 0: a = 0: day = 4 – 1 ‘ // initializations…

m = 0: y = 0: i = 0

k = 0: numDay = 0

month = Array(0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31)

lmonth = Array(0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31)

If (is_range_nep(yy, mm, dd) = False) Then

debug_info = “Out of range”

Else

‘// count total days in-terms of year

For i = 0 To yy – def_nyy – 1

For j = 1 To 12

total_nDays = total_nDays + bs(k)(j)

Next j

k = k + 1

Next i

‘// count total days in-terms of month

For j = 1 To mm – 1

total_nDays = total_nDays + bs(k)(j)

Next j

‘// count total days in-terms of dat

total_nDays = total_nDays + dd

‘//calculation of equivalent english date…

total_eDays = def_edd

m = def_emm

y = def_eyy

Do While (total_nDays <> 0)

If (is_leap_year(y)) Then

a = lmonth(m)

Else

a = month(m)

End If

total_eDays = total_eDays + 1

day = day + 1

If (total_eDays > a) Then

m = m + 1

total_eDays = 1

If (m > 12) Then

y = y + 1

m = 1

End If

End If

If (day > 7) Then day = 1

total_nDays = total_nDays – 1

Loop

numDay = day

eng_date(“year”) = y

eng_date(“month”) = m

eng_date(“date”) = total_eDays

eng_date(“day”) = get_day_of_week(day)

eng_date(“emonth”) = get_english_month(m)

eng_date(“num_day”) = numDay

End If

End Sub

Code 2

Public Function nepaliToEnglish(yy, mm, dd, formate)

‘ this function depends on Nepali_calander class

‘@copyfree nirmaljoshi.com.np,2010

‘formateType default=2010/1/25

‘formateType 1=2010-jan-25

‘formateType 2=2010-jan-25-saturday

If IsMissing(formate) Then formateType = 0

‘MsgBox formateType

Dim a As Nepali_Calender

Set a = New Nepali_Calender

Call a.initilizeClass

Call a.nep_to_eng(yy, mm, dd)

If a.debug_info = “” Then

Select Case formate

Case 1:

output = a.eng_date(“year”) & “-” & a.eng_date(“emonth”) & “-” & a.eng_date(“date”)

Case 2:

output = a.eng_date(“year”) & “-” & a.eng_date(“emonth”) & “-” & a.eng_date(“date”) & “-” & a.eng_date(“day”)

Case Else:

output = a.eng_date(“year”) & “/” & a.eng_date(“month”) & “/” & a.eng_date(“date”)

End Select

Else

output = a.debug_info

End If

nepaliToEnglish = output

End Function

Public Function englishToNepali(yy, mm, dd, formate)

‘ this function depends on Nepali_calander class

‘@copyfree nirmaljoshi.com.np,2010

‘formateType default=20671/25

‘formateType 1=2067-mangsir-25

‘formateType 2=2067-mangsir-25-saturday

If IsMissing(formate) Then formateType = 0

‘MsgBox formateType

Dim a As Nepali_Calender

Set a = New Nepali_Calender

Call a.initilizeClass

Call a.eng_to_nep(yy, mm, dd)

If a.debug_info = “” Then

Select Case formate

Case 1:

output = a.nep_date(“year”) & “-” & a.nep_date(“nmonth”) & “-” & a.nep_date(“date”)

Case 2:

output = a.nep_date(“year”) & “-” & a.nep_date(“nmonth”) & “-” & a.nep_date(“date”) & “-” & a.nep_date(“day”)

Case Else:

output = a.nep_date(“year”) & “/” & a.nep_date(“month”) & “/” & a.nep_date(“date”)

End Select

Else

output = a.debug_info

End If

englishToNepali = output

End Function