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Comparison Operators for date_xx
# S3 method for date_xx Ops(e1, e2)
a logical scalar
logical
Objects with the same date_xx subclass (one of them can also be integer)
date_xx
date_yq(2015, 1) < date_yq(2015, 2) # comparison with integers is ok date_yq(2015, 1) < 20152 # but two different date_xx cannot be compared try(date_yq(2015, 1) < date_ym(2015, 2))
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