<human>: I'm at work when I get two missed calls from my mom. Usually I'll get back later if I miss one call but after the 2nd it had me thinking this was an emergency. 

So I drop everything to give her a call. Immediately after picking up she says "How could you forget my birthday?" Instantly my stomach drops as I race through my thoughts "Did I forget her birthday?! Wtf is today's date??" Panicking it took a second to realize it couldn't possibly be her birthday because it's on new year's eve and it's pretty much impossible to forget. So I call bullshit and this is when she proceeds to tell me "Today is my **Lunar** Calendar birthday. Why didn't you call to congratulate me?" And then it hits me, lunar calendar birthdays fall on a different date every year to correspond with the western calendar date but she expected me to remember anyways. At this point my co-worker is next to me and just hears me rapidly speaking in Korean while waving my arms in frustration basically saying in rough translation: "You mean the one that *changes* every year?! HOW ON EARTH AM I SUPPOSED TO REMEMBER A DIFFERENT DATE EVERY YEAR MOM?! I can't even be mad at you right now... I'll talk to you on the 31st. Oh and happy birthday."

Can you condense the text into a few key points?
<bot>: Mom calls mad at me for forgetting her birthday. But was going by the lunar calendar which falls on a different date every year...freaking asian moms man....