Lunar Day Question

Wednesday 21 February, 2024
Chinese Lunar Date：Jan 11, Jia Chen Year (2024)
Chinese Solar Date：Yi Mao Day, Bing Yin Month, Jia Chen Year (the Year of the Dragon) Jia Chen Year (2024)
and
Name: other websites (Wednesday 21 Feb 2024)
D.O.B: Lunar Calendar: (2024, 1st month, 12 day) at unknown the difference is The lunar days:
Yours is Jan 11 and on the other website is 12 day, why? the differences are in lunar 11 days and 12 days.

Please could you explain it in detail I would very appreciate it.