求助！给父母申请移民担保人在新西兰居住时间的问题

kissyrain

Sponsorship requirementsA sponsor must:

• be 18 years of age or over
• be in New Zealand
• be a New Zealand or Australian citizen or the holder of a current residence permit that is not subject to requirements under section 18A of the Immigration Act 1987 or the holder of a residence class visa that is not subject to requirements under section 49(1) of the Immigration Act 2009 have been a New Zealand or Australian citizen and/or the holder of a residence permit or a residence class visa or a returning resident’s visa for at least three years immediately before the date their registration is received by Immigration New Zealand
• in each of the three 12-month portions within that three-year period, have spent a total of 184 days or more in New Zealand.

请问这3年的时间是从何算起的？这段话的意思是说从递交申请之日往前推3年是吗？？我画红线的那段话是什么意思呢？？