已解决，谢谢！
通常是以2018年的12月29日为基准然后多给15天。
我原本也认为是2楼这样的，但是最近看到TIER 2 Guidance上这么写的 - 所以究竟会是哪种情况？
You may be granted leave whichever is the shorter of:
i. to the job end date shown on your Certificate of Sponsorship plus 14 days, or
ii. up to five years, or
iii. for the period of time you need to take your total stay in Tier 2 (discounting leave as a Tier 2 (Intra-Company Transfer)) to six years (this is counted from the date you were first granted entry clearance or leave to remain). Please note that the six years is not broken by any gaps between your periods of leave up to 28 days. For example, if you have had six years continuous leave in Tier 2 (General)
but you overstay for 27 days at the end of the six years before applying again, the 27 days in which you had no Tier 2 (General) leave does not mean you can apply again. Similarly, if you have overstayed up to 27 days in the middle of a period of continuous leave, this does not mean you can apply for another period of leave to take your total stay in Tier 2 beyond six years.
应该是是CoS上写的End Date + 一定时间吧
我原来PSW转T2是2月份去签的，最后给到了3年后的7月底(CoS上写的end date)
HI， 我知道续签T2G 提前三个月就可以申请提交了，请问楼主你当初续签的COS 是在提前多久开始申请的？是不是不一定要在规定的3个月内申请？
COS我是差不多就提前了三个月申请的，因为COS有效期是三个月，所以到签证到期那天都会有效。
恩。 我的意思是譬如我的签证7.20到期，我可以4.20号是可以签证了。 那么我现在可以去要求申请COS了吗？
我现在T2二月底过期，上个月刚拿到新的T2续签，的确是比CoS上的end date多15天，到19年三月中旬。