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The general format for “timestamp_micros” seems correct. However, Google Analytics 4 (GA4) ‘timestamp_micros’ requires values to be in microseconds since the Unix epoch (1 January 1970), expressed as a 64-bit integer. If you’re using the conventional ISO 8601 timestamp format (which it looks like you are), you might not see the events reflect the correct timestamp in GA4.
You need to convert your timestamps to the Unix epoch format in microseconds. For your requirement of adding a timestamp dimension to the offline data when importing it to GA4, unfortunately, as of now, there’s no straight way of doing that without using Google Tag Manager (GTM). Since GA4 is event-based, a timestamp dimension would be an event parameter and such parameters can only be sent event-wise, which GTM does by default.
If you’re not seeing the results even after 24 hours, also ensure the date range of the data you are uploading is within the last 14 months, as this is the default lookback window in GA4 for most reports. You also need to cross-check whether the user property in GA4 matches the unique identifier in your CRM. If the problem persists, it’s recommended to get in touch with Google Support for further assistance.
