Detect SQL min date string in javascript

In an angularJS application I'm working on, we are using a SQL server to provide data. Nothing odd there. I am tasked with working on the date sanitation, so objects that are passed into our application that have the SQL min date value are undefined, and ones that do have a date are javascript Date objects.

I know that during upgrades, sometimes the string that is defined for min date can change. Right now, it is 0001-01-01T00:00:00Z. I cannot just do a string comparison because it could change.

My problem is, how do i determine this min date in javascript? new Date(varThatIsMinDate) is a valid date. MomentJS thinks its valid too, and it is technically a valid date. I'm less worried about validation and more worried about "is it min date"

How do you determine min date === true from a zulu pattern 0001-01-01T00:00:00Z or similar in javascript?

My code so far, cause I know you are gonna ask for it:

if (response.config.responseType === 'json') { for (var property in response.data) { if (response.data.hasOwnProperty(property)) { if (property.toUpperCase().indexOf('DATE') > -1 || property.toUpperCase().indexOf('TIME') > -1) { console.log(property.toUpperCase()); // Attempt to use JS built in date and validate var tmpDate = new Date(response.data[property]); if ($moment(tmpDate).isValid()) { // Make it a valid date object if it has a valid date response.data[property] = tmpDate; } else { // Make it undefined response.data[property] = undefined; } } } } } 

Thing is, its always valid, so this code doesn't work.

EDIT: I could cheat and use tmpDate.getUTCFullYear() === 1 but i'd like to know how to do this the right way.