A childhood belief about dangerous food

When The start of Daylight Saving Time in the USA was changed for late April to early April, I thought I had a guess as to why, or at least as to what made it a good idea. I had heard my aunt and some others taalking of a saying that oysters are safe to eat in months whose names contain the letter "R", but not in months containing no "R". That apparently is a real saying. But my aunt went on to tell me that once she had eaten some oysters at what she thought was about 11:30 PM on April 30. Then she made a horrific discovery that she'd forgotten to reset her watch to Daylight Saving Time, so she actually ate those oysters around 12:30 AM on May 1. She said she got really sick from eating those oysters. So I thought that changing the time change to early April was good for that reason, for that way hardly anybody could have failed to reset their watches by May 1. (Later my aunt told me that her story about getting sick from eating oysters that time was a joke, and that she's never really gotten sick from eating oysters, although the saying might have some rough validity.)