is there a user profile property to see the user sign up datetime?

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Yes, there are a couple of ways to track user sign-up datetime in Mixpanel user profiles: 1. You can use the reserved profile property $created which is specifically meant for storing when a profile was created. However, it's important to note that this property is not automatically populated - you need to set it manually when creating the user profile.2. Alternatively, Mixpanel automatically calculates a property called $mp_first_event_time which represents "the time of the user's very first event in Mixpanel." If your sign-up event is the first event a user triggers, this property would effectively represent their sign-up time.For a custom implementation, you could also: 3. Create your own custom profile property (like "signup_date") and set it once using the $set_once operation, which is useful for properties like "First login date" as it will not overwrite existing values.Reserved Properties documentation provides more details about the $created property, and the documentation also mentions that timestamps in Mixpanel are ingested with millisecond precision but exported with second precision.

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