Add documentation for ITime

NEWS.md

@@ -7,6 +7,8 @@ main
   PR[#973](https://github.com/CliMA/ClimaLand.jl/pull/973)
 - Revert PR993 changes to runoff
   PR[#1021](https://github.com/CliMA/ClimaLand.jl/pull/1021)
+- Add ITime (see [ClimaUtilities documentation](https://clima.github.io/ClimaUtilities.jl/dev/timemanager/) for more information)
+  PR[#1030](https://github.com/CliMA/ClimaLand.jl/pull/1030)
 
 v0.15.9
 -------

docs/make.jl

@@ -58,6 +58,7 @@ pages = Any[
     "Diagnostics" => diagnostics,
     "Leaderboard" => "leaderboard/leaderboard.md",
     "Restarts" => "restarts.md",
+    "Time type" => "timemanager.md",
     "Misc. utilities" => "shared_utilities.md",
     "APIs" => apis,
     "Contribution guide" => "Contributing.md",

docs/src/timemanager.md

@@ -0,0 +1,23 @@
+## ITime
+
+`ITime`, or _integer time_, is a time type used by CliMA simulations to keep
+track of simulation time. For more information, refer to the
+[TimeManager section](https://clima.github.io/ClimaUtilities.jl/dev/timemanager/)
+in ClimaUtilities and the 
+[ITime section](https://clima.github.io/ClimaAtmos.jl/dev/itime/) in ClimaAtmos.
+
+### How do I use ITime?
+
+We do not support the functionality of running simulations using either `ITime` or
+floating point. See the simulations below that automatically use `ITime`.
+
+1. Snowy land long run
+2. Soil-Canopy long run
+3. California regional simulation long run
+4. Soil model long run
+5. Global bucket simulation long run
+6. Bucket ERA5 model experiment
+7. Richards runoff standalone experiment
+
+If there is a particular simulation that is not compatible with `ITime` and you
+would like to use `ITime` with it, then please open an issue for it!