Moment

moment-now.coffee

coffee> moment().subtract(5, 'minutes')
{ [Number: 1512430172340]
  _isAMomentObject: true,
  _isUTC: false,
  _pf:
   { empty: false,
     unusedTokens: [],
     unusedInput: [],
     overflow: -2,
     charsLeftOver: 0,
     nullInput: false,
     invalidMonth: null,
     invalidFormat: false,
     userInvalidated: false,
     iso: false },
  _locale:
   Locale {
     _ordinalParse: /\d{1,2}(th|st|nd|rd)/,
     ordinal: [Function: ordinal],
     _abbr: 'en',
     _ordinalParseLenient: /\d{1,2}(th|st|nd|rd)|\d{1,2}/ },
  _d: 2017-12-04T23:29:32.340Z,
  _isValid: true }

moment-then.coffee

coffee> moment().subtract(5, 'minutes')
{ [Number: 1512430007457]
  _isAMomentObject: true,
  _isUTC: false,
  _pf:
   { empty: false,
     unusedTokens: [],
     unusedInput: [],
     overflow: -2,
     charsLeftOver: 0,
     nullInput: false,
     invalidMonth: null,
     invalidFormat: false,
     userInvalidated: false,
     iso: false },
  _locale: Locale { ordinal: [Function: ordinal], _abbr: 'en' },
  _d: 2017-12-04T23:26:47.457Z }

tz-now.coffee

coffee> tz().subtract(5, 'minutes')
moment("2017-12-04T15:31:59.804")

tz-then.coffee

tz().subtract(5, 'minutes')
{ [Number: 1512430428411]
  _isAMomentObject: true,
  _isUTC: false,
  _pf:
   { empty: false,
     unusedTokens: [],
     unusedInput: [],
     overflow: -2,
     charsLeftOver: 0,
     nullInput: false,
     invalidMonth: null,
     invalidFormat: false,
     userInvalidated: false,
     iso: false },
  _locale: Locale { ordinal: [Function: ordinal], _abbr: 'en' },
  _d: 2017-12-04T23:33:48.411Z }