in charts/shared/moment.js [203:251]
function copyConfig(to, from) {
var i,
prop,
val,
momentPropertiesLen = momentProperties.length;
if (!isUndefined(from._isAMomentObject)) {
to._isAMomentObject = from._isAMomentObject;
}
if (!isUndefined(from._i)) {
to._i = from._i;
}
if (!isUndefined(from._f)) {
to._f = from._f;
}
if (!isUndefined(from._l)) {
to._l = from._l;
}
if (!isUndefined(from._strict)) {
to._strict = from._strict;
}
if (!isUndefined(from._tzm)) {
to._tzm = from._tzm;
}
if (!isUndefined(from._isUTC)) {
to._isUTC = from._isUTC;
}
if (!isUndefined(from._offset)) {
to._offset = from._offset;
}
if (!isUndefined(from._pf)) {
to._pf = getParsingFlags(from);
}
if (!isUndefined(from._locale)) {
to._locale = from._locale;
}
if (momentPropertiesLen > 0) {
for (i = 0; i < momentPropertiesLen; i++) {
prop = momentProperties[i];
val = from[prop];
if (!isUndefined(val)) {
to[prop] = val;
}
}
}
return to;
}