diff --git a/tests/cql/CqlComparisonOperatorsTest.xml b/tests/cql/CqlComparisonOperatorsTest.xml
index 67eb1ce..4898a8f 100644
--- a/tests/cql/CqlComparisonOperatorsTest.xml
+++ b/tests/cql/CqlComparisonOperatorsTest.xml
@@ -809,4 +809,164 @@
+
+
+ 1 millisecond = 1 'ms'
+
+
+
+ 1 millisecond = 1 milliseconds
+
+
+
+ 1 milliseconds = 1 'ms'
+
+
+
+ 1 second = 1 's'
+
+
+
+ 1 second = 1 seconds
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+
+
+ 1 seconds = 1 's'
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+
+
+ 1 minute = 1 'min'
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+
+
+ 1 minute = 1 minutes
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+
+
+ 1 minutes = 1 'min'
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+
+
+ 1 hour = 1 'h'
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+
+
+ 1 hour = 1 hours
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+
+
+ 1 hours = 1 'h'
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+
+
+ 1 day = 1 'd'
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+
+
+ 1 day = 1 days
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+
+
+ 1 days = 1 'd'
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+
+
+ 1 week = 1 'wk'
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+
+
+ 1 week = 1 weeks
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+
+
+ 1 weeks = 1 'wk'
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+
+
+ 1 month = 1 'mo'
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+
+
+
+ 1 month != 1 'mo'
+
+
+
+
+ 1 month ~ 1 'mo'
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+
+
+ 1 month = 1 months
+
+
+
+ 1 months != 1 'mo'
+
+
+
+
+ 1 months ~ 1 'mo'
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+
+
+ 1 year = 1 'a'
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+
+
+
+ 1 year != 1 'a'
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+
+
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+ 1 year ~ 1 'a'
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+
+
+ 1 years = 1 year
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+
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+ 1 years != 1 'a'
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+
+
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+ 1 years ~ 1 'a'
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+
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+ 1 year ~ 12 months
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+
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+ 1 year ~ 365 days
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+
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+ 1 month ~ 30 days
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+
+
+ 1 week = 7 days
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+
+
+ 1 day = 24 hours
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+
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+ 1 hour = 60 minutes
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+
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+ 1 minute = 60 seconds
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+
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+ 1 second = 1000 milliseconds
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+
+