Mother's Day in the United States is celebrated on the second Sunday of May every year.
In 1998, Mother's Day fell on:
Sunday, May 10th, 1998
So, if your mom's birthday is around this time, you might want to celebrate her special day again!
Here's the calendar for May 1999:
```
Su Mo Tu We Th Fr Sa
28 29 30
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29 30 31
```
In May 1999, the following days fell on each day of the week:
* Monday, May 3rd
* Tuesday, May 4th
* Wednesday, May 5th
* Thursday, May 6th
* Friday, May 7th
* Saturday, May 8th
* Sunday, May 9th
* Monday, May 10th
* ...and so on.
Let me know if you have any specific questions about this calendar or if there's anything else I can help with!