The binary files time cannot be read correctly due to int32

[mini-DONG]

Hi!
xmitgcm can read MITgcm mds binary files fastly, and I use it a lot.
But I meet a problem recently, I run the MITgcm model for 100 years. Then I used xmitgcm to read the model output like:

from xmitgcm import open_mdsdataset
ds = open_mdsdataset(
                     r'G:\exp\ctrl',
                     r'G:\exp',
                     iters=[8953200],
                     delta_t=240)

I find the time is negative:

There is no problem with the output before this moment.
I noticed that the iter use the int32 which cover -2,147,483,647~2,147,483,647. But the 8953200*240=2148768000 which is greater than the maximun of int32 .
So, may be we need the int64 to solve the problem. And what should I do to read the time correctly?