Gimmel tammuz is not the same as tisha bav.
It just isn't.
Sorry.
Also, I was more pointing out that not everyone is familiar with lubavitch days, and therefore was playing dumb and asking why include the hebrew date, would you say the hebrew date if it was daled?
Also, I did open it up because of the title, but not why you think; a friend on the forums texted me and said I should ask what gimmel tammuz was, so I did this instead.
Sorry for not being lubavitch.