#6135: fix column type when date (#6243)
#6135: fix column type when date (#6243)


twosigma/beakerx,twosigma/beakerx,jpallas/beakerx,twosigma/beakerx,twosigma/beakerx,twosigma/beaker-notebook,twosigma/beaker-notebook,jpallas/beakerx,twosigma/beakerx,jpallas/beakerx,jpallas/beakerx,jpallas/beakerx,twosigma/beaker-notebook,twosigma/beaker-notebook,jpallas/beakerx,twosigma/beaker-notebook,twosigma/beakerx