QDateTimeParser::fromString(), when parsing a date-time, uses the start of 1900, in local time, as its default date-time. (This is a bad choice and steadily getting worse.) This turns out to be somewhat expensive for some client code, so make it a static const so that we only compute it on the first call, as for getM{in,ax}imum(). The potential downside is that a change to system time zone won't be reflected in this value. However, any sane parse-format should require over-writing all fields of this initial value, in any case, so the issue is less severe for this default value than for the existing getM{in,ax}imum() statics. Change-Id: Iacfd827fe76c4e5fbdc5e5b6efefed13bc673af4 Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>