-- First, define a table of text to search for, and what to convert it to.

local conversionTable = {
   ['जनवरी'] = 'January',
   ['फेब्रुअरी'] = 'February',
   ['मार्च'] = 'March',
   ['अप्रिल'] = 'April',
   ['मे'] = 'May',
   ['जुन'] = 'June',
   ['जुलाई'] = 'July',
   ['अगस्ट'] = 'August',
   ['सेप्टेम्बर'] = 'September',
   ['अक्टोबर'] = 'October',
   ['नोभेम्बर'] = 'November',
   ['डिसेम्बर'] = 'December',
   ['०'] = '0',
   ['१'] = '1',
   ['२'] = '2',
   ['३'] = '3',
   ['४'] = '4',
   ['५'] = '5',
   ['६'] = '6',
   ['७'] = '7',
   ['८'] = '8',
   ['९'] = '9',
}

-- Then we define a table to hold our function
local p = {}

-- Then we define a function that converts strings using conversionTable.
function p.main(frame)
    local s = frame.args[1] -- This gets the first positional argument.
    for bn, en in pairs(conversionTable) do -- This converts every string found in the table.
        s = mw.ustring.gsub(s, bn, en)
    end
    return s -- Get the result of the function.
end

return p -- Pass our table containing our function back to Lua.
-- Now we can call our function using {{#invoke:ConvertTime|main|<!-- your text here -->}}.