isTokenExpired method
Implementation
bool isTokenExpired(String token, [num offsetSeconds = 0]) {
DateTime expiry = _getTokenExpirationDate(token);
num expiryMilis = expiry.millisecondsSinceEpoch;
num nowMilis =
DateTime.now().millisecondsSinceEpoch + (offsetSeconds * 1000);
return expiryMilis < nowMilis;
}