Parse "0915-1015", optionally with a day filter after a colon:
"0930-1600:23456" is Monday to Friday. Whitespace around the parts is
ignored. An end at or before the start is a window that runs past midnight.
Returns null rather than throwing, because the spec is normally a string a
user typed into a settings field and a half-typed one arrives on every
keystroke.
Parse
"0915-1015", optionally with a day filter after a colon:"0930-1600:23456"is Monday to Friday. Whitespace around the parts is ignored. An end at or before the start is a window that runs past midnight.Returns null rather than throwing, because the spec is normally a string a user typed into a settings field and a half-typed one arrives on every keystroke.