Here's my situation:

I'm flying JFK to Brussels in a few hours via Frankfurt. My first segment (JFK-FRA) is with Singapore airlines, and my second segment (FRA-BRU) is a Mileageplus award operated by Lufthansa.

I just attempted to print my boarding pass on LH's website, using their confirmation code, and it displays the wrong date for my flight (April 15, instead of April 16). This only happens when I try to check in. Everywhere else on their website, my flight date is correct.

What should I do? Would calling Lufthansa customer service help, or is there a better solution?