Is TWSE open on Wednesday 17 February 1999?

No. TWSE is closed on Wednesday 17 February 1999 for Chinese New Year. It reopens on Friday 19 February 1999.

Chinese New Year

Related markets on 17 Feb 1999

TSE Tokyo	09:00–15:00
HKEX	The second day of Chinese New Year
SSE	Chinese New Year (Spring Festival)
KRX	Seollal (New Year's Day by the lunar)
NSE	09:55–15:45
SGX	Chinese New Year (estimated)
ASX	10:00–16:00
NYSE	09:30–16:00
Nasdaq	09:30–16:00
TSX	09:30–16:00