Alternatively, I could have waited a minute. 
Anyway, to be super strict, here is another code snippet, which shows the modification time stamp:
name = 'tmp1.pt'
torch.save(torch.randn(1), name)
print("Last modified: %s" % time.ctime(os.path.getmtime(name)))
print("Created: %s" % time.ctime(os.path.getctime(name)))
> Last modified: Tue Aug  4 16:39:44 2020
Created: Tue Aug  4 16:39:44 2020

time.sleep(60)
torch.save(torch.randn(1), name)
print("Last modified: %s" % time.ctime(os.path.getmtime(name)))
print("Created: %s" % time.ctime(os.path.getctime(name)))
> Last modified: Tue Aug  4 16:40:44 2020
Created: Tue Aug  4 16:39:44 2020