查看“时间格式的处理”的源代码

* 读入
 year =0  & month = 0 & day = 0 ;初始化定义
 Date='2012-02-21'
 reads,Date,year,month,day,format='(I4,1x,I2,1x,I2)'

* 转换成儒略日
 TIMEGEN,JULDAY

* 画图，时间坐标
 label_date

 例：  dummy = LABEL_DATE(DATE_FORMAT='%M%Z')
 mytimes=timegen(12,unit='months'',start=julday(1,1,2012))
 y=findgen(12)
 plot,mytimes,y,xtickformat='label_date'

 DATE_FORMAT 格式
 %M for month
 %N for month (2 digit abbr)
 %D for day of month,
 %Y for 4 digit year.
 %Z for last two digits of year.
 %W for day of week

    For time:
 %A for AM or PM
 %H for Hours, 2 digits.
 %I for minutes, 2 digits.
 %S for Seconds, 2 digits.
 %0--%9 following %S, indicates digits after decimal point.
 %% is %
 例子  '%D/%N/%Y' yields 11/12/1993
 '%M!C%Y' yields DEC on the top line, 1993 on  the bottom (!C is the new line graphic command).