20 18 this year is February 19 in Tomb-Sweeping Day, which is the first month. Why is the third month on the mobile phone calendar?

First of all, Tomb-Sweeping Day on 20 18 is February 20th;

Secondly, the calendar month is not synchronized with the lunar month, but with the solar terms.

Moreover, the display on the mobile phone is not accurate enough, and the date and month will change when the solar terms alternate.

Finally, please refer to the screenshot of the calendar below.