Notice periods are negotiation, not folklore
Standard notice is a contract term — not a moral law. Employers sometimes accept shorter notice; new employers sometimes flex start dates. Map your last day before you send the resignation email so you know what you are asking for.
Gap days between jobs affect cash flow, benefits continuity, and mental reset. A negative gap means overlap — possible if you are juggling training at the new role while wrapping the old one. Plan PTO and handoffs around the calendar, not vibes.
Put your last day in writing after HR confirms. This calculator is for planning; your official end date comes from payroll and policy.