Add documentation for patterns specifying day time period There is no API change RELNOTES: n/a
Add documentation for patterns specifying day time period
There is no API change
RELNOTES: n/a

PiperOrigin-RevId: 410354272
Change-Id: I4136a5adc4b40c8890fe7b86ea3c18722c214adb

google/closure-library,google/closure-library,google/closure-library,google/closure-library,google/closure-library