为什么我用sort stkcd date 不能实现按日期先后排序呢？

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Example generated by -dataex-. To install: ssc install dataex
clear
input long stkcd str10 date str12 C double(D E F G H) str12(I J K L) str17 M str12 N
1 "1/10/2019" "平安银行"  .016097 1.730e+11 1.730e+11 -.003634 3.0331174 "" "" "" "" "" ""
1 "1/11/2019" "平安银行"  .009901 1.750e+11 1.750e+11  .007389 3.0331174 "" "" "" "" "" ""
1 "1/14/2019" "平安银行" -.008824 1.740e+11 1.740e+11 -.007074 3.0331174 "" "" "" "" "" ""
1 "1/15/2019" "平安银行"  .012859 1.760e+11 1.760e+11  .013637 3.0331174 "" "" "" "" "" ""
1 "1/16/2019" "平安银行"  .023438 1.800e+11 1.800e+11   .00003 3.0331174 "" "" "" "" "" ""
1 "1/17/2019" "平安银行" -.021947 1.760e+11 1.760e+11 -.004196 3.0331174 "" "" "" "" "" ""
1 "1/18/2019" "平安银行"  .017561 1.790e+11 1.790e+11  .014208 3.0331174 "" "" "" "" "" ""
1 "1/2/2019"  "平安银行" -.020256 1.580e+11 1.580e+11  -.01147 3.0331174 "" "" "" "" "" ""
1 "1/21/2019" "平安银行" -.008629 1.780e+11 1.780e+11  .005587 3.0331174 "" "" "" "" "" ""
1 "1/22/2019" "平安银行" -.005803 1.770e+11 1.770e+11   -.0118 3.0331174 "" "" "" "" "" ""
1 "1/23/2019" "平安银行"  .006809 1.780e+11 1.780e+11  .000504 3.0331174 "" "" "" "" "" ""
1 "1/24/2019" "平安银行"  .016425 1.810e+11 1.810e+11  .004142 3.0331174 "" "" "" "" "" ""
1 "1/25/2019" "平安银行"  .045627 1.890e+11 1.890e+11   .00387 3.0331174 "" "" "" "" "" ""
1 "1/28/2019" "平安银行" -.005455 1.880e+11 1.880e+11 -.001824 3.0331174 "" "" "" "" "" ""
1 "1/29/2019" "平安银行"  .005484 1.890e+11 1.890e+11 -.001049 3.0331174 "" "" "" "" "" ""
1 "1/3/2019"  "平安银行"  .009793 1.590e+11 1.590e+11 -.000377 3.0331174 "" "" "" "" "" ""
1 "1/30/2019" "平安银行" -.004545 1.880e+11 1.880e+11   -.0072 3.0331174 "" "" "" "" "" ""
1 "1/31/2019" "平安银行"  .013699 1.910e+11 1.910e+11  .003493 3.0331174 "" "" "" "" "" ""
1 "1/4/2019"  "平安银行"  .050647 1.670e+11 1.670e+11  .020494 3.0331174 "" "" "" "" "" ""
1 "1/7/2019"  "平安银行" -.001026 1.670e+11 1.670e+11  .007245 3.0331174 "" "" "" "" "" ""
end

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