An example for Gregorian to Shamsi (Jalali or Persian) date conversion in Hugo Templating language. - تبدیل تاریخ از میلادی به شمسی در هوگو

Hugo-Shamsi-Jalali-Persian-Date.txt

{{ $shamsi := newScratch }}
{{ $shamsi.Set "diff" (sub (add ( div .PublishDate.Unix 86400) 25569) (add ( div (time "1920-03-20").Unix 86400) 25569)) }}
{{ $shamsi.Set "gn" (div (mod (mul ($shamsi.Get "diff") 100) 36525) 100) }}
{{ $shamsi.Set "year" (math.Floor (add (div ($shamsi.Get "diff") 365.25) 1299)) }}

{{ if lt (int ($shamsi.Get "gn")) 186 }}
  {{$shamsi.Set "month" (add (mod (int (div ($shamsi.Get "gn") 31)) 12) 1)}}
{{else if eq (mod (int (div ($shamsi.Get "diff") 365.25)) 4) 0}}
  {{ $shamsi.Set "month" ( add (mod (add (int (div (sub (int ($shamsi.Get "gn")) 186) 30)) 6) 12) 1) }}
{{else if lt (int ($shamsi.Get "gn")) 336 }}
  {{ $shamsi.Set "month" ( add (mod (add (int (div (sub (int ($shamsi.Get "gn")) 186) 30)) 6) 12) 1) }}
{{else}}
  {{ $shamsi.Set "month" ( add (mod (add (int (div (sub (int ($shamsi.Get "gn")) 336) 29)) 11) 12) 1) }}
{{ end }}

{{ if lt (int ($shamsi.Get "gn")) 186 }}
  {{ $shamsi.Set "day" (add (mod (int ($shamsi.Get "gn")) 31) 1) }}
{{else if eq (mod (int (div ($shamsi.Get "diff") 365.25)) 4) 0}}
  {{ $shamsi.Set "day" (add (mod (sub (int ($shamsi.Get "gn")) 186) 30) 1) }}
{{else if lt (int ($shamsi.Get "gn")) 336 }}
  {{ $shamsi.Set "day" (add (mod (sub (int ($shamsi.Get "gn")) 186) 30) 1) }}
{{else}}
  {{ $shamsi.Set "day" (add (mod (sub (int ($shamsi.Get "gn")) 336) 29) 1) }}
{{ end }}
{{ $shamsi.Get "year" }}/{{$shamsi.Get "month"}}/{{$shamsi.Get "day"}}