now
今 centers on the present moment: the immediate now, as opposed to past or future.
今 is a pictograph originally representing a cover or lid, but it was borrowed early to represent the abstract idea of 'now'. The modern form retains the basic shape but the connection to the original pictograph is not obvious.
The top 亼 looks like a person reaching down, and the bottom ㇇ is a hook catching the present moment. Together they form 今, meaning 'now'.
For コン, imagine a con artist telling you to act 'now' before the deal disappears: con -> コン, and the urgency fits the meaning of the present moment.
now; the present time; just now; soon; immediately
today; this day
this time; now
this year
this time; now
from now on; hereafter
hello; good day; good afternoon
this evening; tonight
this week
this month
now (when it is already much too late); at this stage
this morning
good evening
now (esp. in contrast to the past); now at last; at present; right now
about this time; about now
I'm home!; I'm back!; it's me!
not quite (right); not very good; somewhat (lacking)
this season
these days; nowadays; recently; lately
tonight; this evening
the present term; the present session
these days; nowadays; today; present age; modern times
this evening; tonight
this year; this fiscal year; this school year
ancient and modern times; all ages; past and present
at any moment (now); at any minute; on the verge of (doing); just about to
this summer; next summer; last summer
one more; another (one)
this autumn; this fall; autumn of this year
this spring; spring this year
before long; even now
past and present
at once; immediately; right now
until now; till now; up to now; up to the present; so far
these days; nowadays; recently
modern; up-to-date
this weekend