Implement active day functionality.

Cargo.lock

@@ -85,6 +85,7 @@ dependencies = [
  "serde",
  "serde_json",
  "structopt",
+ "time",
  "uuid",
 ]
 
@@ -106,6 +107,15 @@ version = "0.2.126"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "349d5a591cd28b49e1d1037471617a32ddcda5731b99419008085f72d5a53836"
 
+[[package]]
+name = "num_threads"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2819ce041d2ee131036f4fc9d6ae7ae125a3a40e97ba64d04fe799ad9dabbb44"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.16"
@@ -271,6 +281,16 @@ dependencies = [
  "unicode-width",
 ]
 
+[[package]]
+name = "time"
+version = "0.3.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72c91f41dcb2f096c05f0873d667dceec1087ce5bcf984ec8ffb19acddbb3217"
+dependencies = [
+ "libc",
+ "num_threads",
+]
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.1"