thefridgeisopen

every second:
    loop all players:
        add 1 to {s::%loop-player's uuid%}
        if {s::%loop-player's uuid%} > 59:
            remove 60 from {s::%loop-player's uuid%} 
            add 1 to {m::%loop-player's uuid%}
        if {m::%loop-player's uuid%} > 59:
            remove 60 from {m::%loop-player's uuid%}
            add 1 to {h::%loop-player's uuid%}
        if {h::%loop-player's uuid%} > 23:
            remove 24 from {h::%loop-player's uuid%}
            add 1 to {d::%loop-player's uuid%}

command /playtime [<offlineplayer>]:
    trigger:
        arg isn't set:
            wait 1 tick
            send ""
            send "&f&l    YOUR PLAYTIME (&7&l%player%&f)"
            send ""
            send "&f&l  SECONDS:&7 %{s::%player's uuid%}%"
            send "&f&l  MINUTES:&7 %{m::%player's uuid%}%"
            send "&f&l  HOURS:&7 %{h::%player's uuid%}%"
            send "&f&l  DAYS:&7 %{d::%player's uuid%}%"
            send ""
        else:
            wait 1 tick
            send ""
            send "&f&l    PLAYTIME OF &7&l%arg%"
            send ""
            send "&f&l  SECONDS:&7 %{s::%arg's uuid%}%"
            send "&f&l  MINUTES:&7 %{m::%arg's uuid%}%"
            send "&f&l  HOURS:&7 %{h::%arg's uuid%}%"
            send "&f&l  DAYS:&7 %{d::%arg's uuid%}%"
            send ""

Heres another script for the mh community!