查看“时间格式的处理”的源代码

*[[儒略日]]计算
 Jul=Julday(month,day,year，hour,minute,second)

*由儒略日计算date
 CALDAT, Jul, Month [, Day [, Year [, Hour [, Minute [, Second]]]]]

*生成儒略日时间
 MyTimes = TIMEGEN(365, UNITS="Days") + SYSTIME(/JULIAN)
 MyTimes = TIMEGEN(12, UNITS="Months", START=JULDAY(1,1,2000))

* 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).

[[astro_lib]]中的儒略日相关程序