Please Help - Negotiating Start Date of New Job in Order to Get Current Employer’s Bonus?

I expect to be paid a large bonus (~80% of salary) at the end of July but have been extended an offer to join a company in Colorado at the end of June. Given I have to be at my company on the bonus payout date in order to get the $, the earliest I can start the new job is first week of August.

Please note that I am currently in NYC and need to relocate to CO as well.

Is asking for a ~6 week extension of the start date in order to get my bonus, give my company proper notice and relocate to a new state unreasonable?

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