Your date pattern is wrong. I suspect you have "mm" instead of "MM" for the month. The one-hour difference in the time is because @timestamp is UTC and your timezone is UTC+1 (on Jan 4 anyway; on Oct 4 it's probably UTC+2).
Your date pattern is wrong. I suspect you have "mm" instead of "MM" for the month. The one-hour difference in the time is because @timestamp is UTC and your timezone is UTC+1 (on Jan 4 anyway; on Oct 4 it's probably UTC+2).
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