This indicator plots under the price chart, the start and end of sessions of the following different markets: Tokyo – London and US
Very useful to quickly know which market session we are in.

Al credits to @Vonasi

NewYorkOpen = 1530
NewYorkClose = 2200
LondonOpen = 0900
LondonClose = 1730
JapanOpen = 0200
JapanClose = 0800

nyOpen =  NewYorkOpen*100
nyClose =  NewYorkClose*100
LoOpen =  LondonOpen*100
LoClose =  LondonClose*100
JaOpen =  JapanOpen*100
JaClose =  JapanClose*100

if opentime = nyopen then
ny=1
endif
if opentime = nyclose then
ny=0
endif

if opentime = loopen then
lo=1
endif
if opentime = loclose then
lo=0
endif

if opentime = jaopen then
ja=1
endif
if opentime = jaclose then
ja=0
endif

if ny then
if not ny[1] then
drawtext("NewYork",barindex-8,2,sansserif,bold,10) coloured(0,0,0)
endif
drawtext("█",barindex,2,sansserif,bold,16) coloured(0,0,255)
endif

if lo then
if not lo[1] then
drawtext("London",barindex-7,1,sansserif,bold,10) coloured(0,0,0)
endif
drawtext("█",barindex,1,sansserif,bold,16) coloured(128,0,0)
endif

if ja then
if not ja[1] then
drawtext("Tokyo",barindex-6,3,sansserif,bold,10) coloured(0,0,0)
endif
drawtext("█",barindex,3,sansserif,bold,16) coloured(0,128,0)
endif

return 0 coloured(0,0,0,0), 4 coloured(0,0,0,0)