formatDateToISO returns invalid value on IE

[Jen-ni]

Input:
FormatUtils.formatDateToISO(
'1.4.2018',
'D.M.YYYY',
true,
'1.4.2018',
'DD/MM/YYYY',
)

Output:
Chrome & Firefox: '2018-04-01T00:00:00.000Z'
IE: '1.4.2018'

Expected outcome:
'2018-04-01T00:00:00.000Z'