About a date bug

for in my logstash conf: index => "system-syslog-%{+YYYYMMDD}"
And in the kibana page it shows "_index": "system-syslog-20180233" for right it should be system-syslog-20180202
How could i fix it...
I just use it from Jan 12th , and date is OK until Jan 31th. When comes into Feb, for Feb 1st it doesn't show 20180201 and shows 20180232 instead..

It‘'s OK for right format i should use YYYYMMdd instead of YYYYMMDD..’

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