Valentine’s Day:

2/14

In Shell or anything with substitution s/0/\// or equivalences:

$ date +%Y | sed s=0=/=
$ date +%Y | sed y=0=/=
$ date +%Y | tr 0 /

Another one in Python, which might need more work:

if we <3:
  try:
    more <3
  except war:
    pass

Got anything else?