diff --git a/lib/base/serialize.js b/lib/base/serialize.js index d13f4ce942..4f68e632f9 100644 --- a/lib/base/serialize.js +++ b/lib/base/serialize.js @@ -19,7 +19,7 @@ module.exports = {}; * @return {string|object} date formatted in YYYY-MM-DD form */ module.exports.iso8601Date = function(d) { - if (_.isUndefined(d) || _.isString(d) || !((d instanceof Date))) { + if (_.isUndefined(d) || _.isString(d) || !(_.isDate(d))) { return d; } else { return moment.utc(d).format('YYYY-MM-DD');