extensions/typescript-language-features/src/utils/logLevelMonitor.ts/LogLevelMonitor/lastLogLevelChange
class LogLevelMonitor:	private get lastLogLevelChange(): Date | undefined {
		const lastChange = this.context.globalState.get<string | undefined>(LogLevelMonitor.logLevelChangedStorageKey);

		if (lastChange) {
			const date = new Date(lastChange);
			if (date instanceof Date && !isNaN(date.valueOf())) {
				return date;
			}
		}
		return undefined;
	}