Return the clock emoji closest to the current time when run
Ruby — 61 54 bytes
Python 3 — 79 77 75 74 bytes
edit: Turns out this is much shorter in Ruby, because Time doesn't need to be imported and integer division is the default.
a=(Time.now.to_i/900-3)/2%24
puts&quot;&quot;&lt;&lt;128336+a/2+a%2*12

Arithmetic:

Time.now.to_i: Seconds since epoch.
/900: Combine time into 15-minute segments.
-3: -4 because characters start at 1 o'clock, +1 so that rounding is done to nearest half hour, rather than downwards.
/2: Combine into half-hour segments.
%24: Get current half-hour segment out of 12 hours.
a/2 + a%2*12: Account for the fact that whole-hour characters come in a block before half-hour characters.

Local time version, 69 bytes:
n=Time.now
a=((n.to_i+n.gmtoff)/900-3)/2%24
puts&quot;&quot;&lt;&lt;128336+a/2+a%2*12

Original Python 3 version:
import time
a=int((time.time()/900-3)/2%24)
print(chr(128336+a//2+a%2*12))

Prints the current time UTC. Python 2's chr only accepts 0-255, and unichr only 0-65535. In Python 3, / is always floating-point division and // is always integer division.