Function to convert python datetime format to javascript datetime format

python-date-format-to-javascript.js

// ES6 syntax is used. 

/* Key: Python format
 * Value: Javascript format
 */
const pyToJSDateFormats = Object.freeze({
  '%A': 'dddd',                           //Weekday as locale’s full name: (In English: Sunday, .., Saturday)(Auf Deutsch: Sonntag, .., Samstag)   
  '%a': 'ddd',                            //Weekday abbreivated: (In English: Sun, .., Sat)(Auf Deutsch: So, .., Sa)
  '%B': 'MMMM',                           //Month name: (In English: January, .., December)(Auf Deutsch: Januar, .., Dezember)
  '%b': 'MMM',                            //Month name abbreviated: (In English: Jan, .., Dec)(Auf Deutsch: Jan, .., Dez)
  '%c': 'ddd MMM DD HH:mm:ss YYYY',       //Locale’s appropriate date and time representation: (English: Sun Oct 13 23:30:00 1996)(Deutsch: So 13 Oct 22:30:00 1996) 
  '%d': 'DD',                             //Day 0 padded: (01, .., 31)
  '%f': 'SSS',                            //Microseconds 0 padded: (000000, .., 999999)
  '%H': 'HH',                             //Hour (24-Hour) 0 padded: (00, .., 23) 
  '%I': 'hh',                             //Hour (12-Hour) 0 padded: (01, .., 12)
  '%j': 'DDDD',                           //Day of Year 0 padded: (001, .., 366) 
  '%M': 'mm',                             //Minute 0 padded: (01, .. 59) 
  '%m': 'MM',                             //Month 0 padded: (01, .., 12)
  '%p': 'A',                              //Locale equivalent of AM/PM: (EN: AM, PM)(DE: am, pm)
  '%S': 'ss',                             //Second 0 padded: (00, .., 59)
  '%U': 'ww',                             //Week # of Year (Sunday): (00, .., 53)  All days in a new year preceding the first Sunday are considered to be in week 0.
  '%W': 'ww',                             //Week # of Year (Monday): (00, .., 53)  All days in a new year preceding the first Monday are considered to be in week 0.
  '%w': 'd',                              //Weekday as #: (0, 6)
  '%X': 'HH:mm:ss',                       //Locale's appropriate time representation: (EN: 23:30:00)(DE: 23:30:00)
  '%x': 'MM/DD/YYYY',                     //Locale's appropriate date representation: (None: 02/14/16)(EN: 02/14/16)(DE: 14.02.16)
  '%Y': 'YYYY',                           //Year as #: (1970, 2000, 2038, 292,277,026,596)
  '%y': 'YY',                             //Year without century 0 padded: (00, .., 99)
  '%Z': 'z',                              //Time zone name: ((empty), UTC, EST, CST) (empty string if the object is naive).
  '%z': 'ZZ',                             //UTC offset in the form +HHMM or -HHMM: ((empty), +0000, -0400, +1030) Empty string if the the object is naive.
  '%%': '%'                               //A literal '%' character: (%)
});

/* 
 * Description: Convert a python format string to javascript format string
 * Example:     "%m/%d/%Y" to "MM/DD/YYYY"
 * @param:  formatStr is the python format string
 * @return: the javascript format string
 */
function convertPYDateFormatToJS(formatStr){
  for(let key in pyToJSDateFormats){
    formatStr = formatStr.split(key).join(pyToJSDateFormats[key]);
  }
  return formatStr;
}