请教如何提取“2011-1-27 09:49:53:873”的年份、月份及日期

AA=“2011-1-27 09:49:53:873”
W1=AT('-',AA,1)
W2=AT('-',AA,2)
年份=SUBS(AA,1,4)
月份=SUBS(AA,W1+1,W2-W1-1)
日期=ALLT(SUBS(AA,W2+1,2))

m_str="2011-1-27 09:49:53:873"
m_date='{^'+LEFT(m_str,10)-'}'
?"年=",YEAR(&m_date)
?"月=",MONTH(&m_date)
?"日=",day(&m_date)