astropy.time.Time fits format incorrectly includes "(UTC)"

hi! When playing with astropy 1.2.1 I noticed this:

In [1]: import astropy.time
In [2]: t = astropy.time.Time('1999-01-01T00:00:00.123456789')
In [3]: t.format = 'fits'
In [4]: print(t)
1999-01-01T00:00:00.123(UTC)

I’m not sure why the (UTC) part is appended to the string, but the fits specification doesn’t mention this:

http://fits.gsfc.nasa.gov/year2000.html https://archive.stsci.edu/fits/fits_standard/node87.html#s:tsys

When this format is used in actual fits header, various fits header parser tools break.

there was a discussion on the astropy mailinglist, but it seems mail.scipy.org is down so I can’t add a link.

[timj]

I’ll see if I can do a pull request next week.

[astrofrog]

I agree that in cases like this we should just change it even if it breaks things (it’s unlikely to break much)