Why Ruby sucks and Crystal not (time parsing)

Consider this in Ruby:

Time.parse("2018-06-30 10:00 +00:00") # it's ok
Time.parse("2018-06-31 10:00 +00:00") # it gives 2018-07-01, no error

Crystal version:

Time.parse("2018-06-30 10:00 +00:00", "%Y-%m-%d %H:%M %z") # it's ok
Time.parse("2018-06-31 10:00 +00:00", "%Y-%m-%d %H:%M %z") # Unhandled exception: Invalid time (ArgumentError)

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