Pattern: Missing locale for DateFormat
Issue: -
Be sure to specify a Locale when creating a new instance of SimpleDateFormat; the class is locale-sensitive. If you instantiate SimpleDateFormat without a Locale parameter, it will format the date and time according to the default Locale. Both the pattern and the Locale determine the format. For the same pattern, SimpleDateFormat may format a date and time differently if the Locale varies.
// violation, missing locale
new SimpleDateFormat('pattern')
// OK, includes locale
new SimpleDateFormat('pattern', Locale.US)
// OK, includes a variable that perhaps is a locale
new SimpleDateFormat('pattern', locale)