Yes you are right. The dates are clashing.
If you want to give micat. Then here it is.
MICAT 2018 will be conducted in computer-based mode. According to MICAT exam pattern 2018, the test comprises six sections - Psychometric (P), Verbal ability (VA), Quantitative ability and Data Interpretation (QADI), General awareness (GA), Divergent and Convergent Thinking (DCT), and Descriptive Test (DT). MICAT 2018 will be conducted for 2 hours and 45 minutes. The question paper will carry 140 descriptive and objective type questions divided into three parts Part I, II and III according to MICAT exam pattern. Part I comprises Psychometric test, all questions are compulsory. Part II of MICAT question paper consists VA, QA, GA and DCR while Part III comprises the Descriptive Test. MICAT exam pattern 2018 has been prescribed by MICA. MICAT exam pattern helps candidates to get an idea of the overall structure of exam like marking scheme, number of sections, questions and time duration. MICAT 1 2017 is scheduled to be conducted on December 17.
Till the time there is no official change for any you will have to choose the one which is more important to you.
All the best.