PR_TIM2WEEK will convert a Yohkoh time into the corresponding week ID
and print a message on the screen. For example:
IDL> pr_tim2week ; Give the current week number
Setting the keyword will cause the routine to display the first and last day of the week. Short weeks (the first or last week of the year) are flagged with an asterisk. PR_TIM2WEEK calls ANYTIM2WEEKID to make the conversion.