println("What is the current number of seconds since midnight?")
val s = readInt
val m = (s/60) % 60
val h = (s/60/60) % 24
这是我当前的代码。 我只是不知道如何给println（“”），所以它显示在HH：MM形式。 预先感谢您的任何帮助！
Answer 1:
我认为答案是
"%02d:%02d".format(h, m)
基于http://www.scala-lang.org/old/node/5153
Answer 2:
大多喜欢@Floris说：
val s = System.currentTimeMillis / 1000
val m = (s/60) % 60
val h = (s/60/60) % 24
val str = "%02d:%02d".format(h, m)
// str = 22:40
现在，你可以打印出来，就像你会与普通字符串。
由于斯卡拉2.10有串插补功能 ，它允许你写的东西，如：
val foo = "bar"
println(s"I'm $foo!")
// I'm bar!
但我不认为它是非常可读的（提醒perl的）：
val str = f"$h%02d:$m%02d"
Answer 3:
// show elapsed time as hours:mins:seconds
val t1 = System.currentTimeMillis/1000
// ... run some code
val t2 = System.currentTimeMillis/1000
var elapsed_s = (t2 - t1)
// for testing invent some time: 4 hours: 20 minutes: 10 seconds
elapsed_s=4*60*60 + 20*60 + 10
val residual_s = elapsed_s % 60
val residual_m = (elapsed_s/60) % 60
val elapsed_h = (elapsed_s/60/60)
// display hours as absolute, minutes & seconds as residuals
println("Elapsed time: " + "%02d:%02d:%02d".format(elapsed_h, residual_m,
residual_s))
文章来源: How can I convert seconds to time in Scala?
