[2] | 1 | ;+ |
---|
| 2 | ; |
---|
[133] | 3 | ; @file_comments |
---|
[2] | 4 | ; Return the calendar date and time given julian date. |
---|
| 5 | ; This is the inverse of the function JULDAY. |
---|
[133] | 6 | ; |
---|
| 7 | ; @categories Calendar |
---|
[2] | 8 | ; |
---|
| 9 | ; |
---|
[133] | 10 | ; @param JULIAN {in}{required} contains the Julian Day Number (which begins at noon) of the |
---|
[2] | 11 | ; specified calendar date. It should be a long integer. |
---|
| 12 | ; |
---|
[133] | 13 | ; @param MONTH {out} Number of the desired month (1 = January, ..., 12 = December). |
---|
[2] | 14 | ; |
---|
[133] | 15 | ; @param DAY {out} Number of day of the month. |
---|
[2] | 16 | ; |
---|
[133] | 17 | ; @param YEAR {out} Number of the desired year. |
---|
[2] | 18 | ; |
---|
[133] | 19 | ; @param HOUR {out} Hour of the day |
---|
[2] | 20 | ; |
---|
[133] | 21 | ; @param Minute {out} Minute of the day |
---|
[9] | 22 | ; |
---|
[133] | 23 | ; @param Second {out} Second (and fractions) of the day. |
---|
[9] | 24 | ; |
---|
[2] | 25 | ; |
---|
[133] | 26 | ; @keyword NDAYSPM {default=30} for using a calendar with fixed number of days per |
---|
| 27 | ; months. |
---|
| 28 | ; |
---|
| 29 | ; @uses cm_4cal |
---|
| 30 | ; |
---|
| 31 | ; |
---|
| 32 | ; @restrictions Accuracy using IEEE double precision numbers is approximately |
---|
[2] | 33 | ; 1/10000th of a second. |
---|
| 34 | ; |
---|
[133] | 35 | ; @history Translated from "Numerical Recipies in C", by William H. Press, |
---|
[2] | 36 | ; Brian P. Flannery, Saul A. Teukolsky, and William T. Vetterling. |
---|
| 37 | ; Cambridge University Press, 1988 (second printing). |
---|
| 38 | ; |
---|
| 39 | ; DMS, July 1992. |
---|
| 40 | ; DMS, April 1996, Added HOUR, MINUTE and SECOND keyword |
---|
| 41 | ; AB, 7 December 1997, Generalized to handle array input. |
---|
[9] | 42 | ; |
---|
[2] | 43 | ; Eric Guilyardi, June 1999 |
---|
| 44 | ; Added key_work ndayspm for fixed number of days per months |
---|
[9] | 45 | ; |
---|
| 46 | ; AB, 3 January 2000, Make seconds output as DOUBLE in array output. |
---|
[133] | 47 | ; |
---|
| 48 | ; @version $Id$ |
---|
[2] | 49 | ;- |
---|
[9] | 50 | pro CALDAT, julian, month, day, year, hour, minute, second, NDAYSPM = ndayspm |
---|
| 51 | ;------------------------------------------------------------ |
---|
| 52 | @cm_4cal |
---|
| 53 | ;------------------------------------------------------------ |
---|
| 54 | COMPILE_OPT idl2 |
---|
[2] | 55 | |
---|
[9] | 56 | ON_ERROR, 2 ; Return to caller if errors |
---|
[2] | 57 | |
---|
[9] | 58 | IF n_elements(key_caltype) EQ 0 THEN key_caltype = 'greg' |
---|
| 59 | if keyword_set(ndayspm) then key_caltype = '360d' |
---|
| 60 | CASE key_caltype OF |
---|
| 61 | 'greg':BEGIN |
---|
[2] | 62 | |
---|
[9] | 63 | nParam = N_PARAMS() |
---|
| 64 | IF (nParam LT 1) THEN MESSAGE, 'Incorrect number of arguments.' |
---|
[2] | 65 | |
---|
[9] | 66 | min_julian = -1095 |
---|
| 67 | max_julian = 1827933925 |
---|
| 68 | minn = MIN(julian, MAX = maxx) |
---|
| 69 | IF (minn LT min_julian) OR (maxx GT max_julian) THEN MESSAGE, $ |
---|
| 70 | 'Value of Julian date is out of allowed range.' |
---|
[2] | 71 | |
---|
[9] | 72 | igreg = 2299161L ;Beginning of Gregorian calendar |
---|
| 73 | julLong = FLOOR(julian + 0.5d) ;Better be long |
---|
| 74 | minJul = MIN(julLong) |
---|
[2] | 75 | |
---|
[9] | 76 | IF (minJul GE igreg) THEN BEGIN ; all are Gregorian |
---|
| 77 | jalpha = LONG(((julLong - 1867216L) - 0.25d) / 36524.25d) |
---|
| 78 | ja = julLong + 1L + jalpha - long(0.25d * jalpha) |
---|
| 79 | ENDIF ELSE BEGIN |
---|
| 80 | ja = julLong |
---|
| 81 | gregChange = WHERE(julLong ge igreg, ngreg) |
---|
| 82 | IF (ngreg GT 0) THEN BEGIN |
---|
| 83 | jalpha = long(((julLong[gregChange] - 1867216L) - 0.25d) / 36524.25d) |
---|
| 84 | ja[gregChange] = julLong[gregChange] + 1L + jalpha - long(0.25d * jalpha) |
---|
| 85 | ENDIF |
---|
| 86 | ENDELSE |
---|
| 87 | jalpha = -1 ; clear memory |
---|
[2] | 88 | |
---|
[9] | 89 | jb = TEMPORARY(ja) + 1524L |
---|
| 90 | jc = long(6680d + ((jb-2439870L)-122.1d0)/365.25d) |
---|
| 91 | jd = long(365d * jc + (0.25d * jc)) |
---|
| 92 | je = long((jb - jd) / 30.6001d) |
---|
[2] | 93 | |
---|
[9] | 94 | day = TEMPORARY(jb) - TEMPORARY(jd) - long(30.6001d * je) |
---|
| 95 | month = TEMPORARY(je) - 1L |
---|
| 96 | month = ((TEMPORARY(month) - 1L) MOD 12L) + 1L |
---|
| 97 | year = TEMPORARY(jc) - 4715L |
---|
| 98 | year = TEMPORARY(year) - (month GT 2) |
---|
| 99 | year = year - (year LE 0) |
---|
| 100 | ; see if we need to do hours, minutes, seconds |
---|
| 101 | IF (nParam GT 4) THEN BEGIN |
---|
| 102 | fraction = julian + 0.5d - TEMPORARY(julLong) |
---|
| 103 | hour = floor(fraction * 24d) |
---|
| 104 | fraction = TEMPORARY(fraction) - hour/24d |
---|
| 105 | minute = floor(fraction*1440d) |
---|
| 106 | second = (TEMPORARY(fraction) - minute/1440d) * 86400d |
---|
| 107 | ENDIF |
---|
| 108 | |
---|
| 109 | ; if julian is an array, reform all output to correct dimensions |
---|
| 110 | IF (SIZE(julian, /N_DIMENSION) GT 0) THEN BEGIN |
---|
| 111 | dimensions = SIZE(julian, /DIMENSION) |
---|
| 112 | month = REFORM(month, dimensions) |
---|
| 113 | day = REFORM(day, dimensions) |
---|
| 114 | year = REFORM(year, dimensions) |
---|
| 115 | IF (nParam GT 4) THEN BEGIN |
---|
| 116 | hour = REFORM(hour, dimensions) |
---|
| 117 | minute = REFORM(minute, dimensions) |
---|
| 118 | second = REFORM(second, dimensions) |
---|
| 119 | ENDIF |
---|
| 120 | ENDIF |
---|
| 121 | |
---|
| 122 | END |
---|
| 123 | '360d':BEGIN |
---|
| 124 | |
---|
| 125 | jul = long(julian) |
---|
| 126 | f = (jul - floor(jul)) |
---|
| 127 | IF total(f NE 0.0) GT 0 THEN BEGIN ;Get hours, minutes, seconds. |
---|
[2] | 128 | hour = floor(f*24.) |
---|
| 129 | f = f - hour / 24.d |
---|
| 130 | minute = floor(f*1440) |
---|
| 131 | second = (f - minute/1440.d0) * 86400.0d0 |
---|
[9] | 132 | ENDIF ELSE BEGIN |
---|
| 133 | hour = replicate(0L, n_elements(julian)) |
---|
| 134 | minute = replicate(0L, n_elements(julian)) |
---|
| 135 | second = replicate(0L, n_elements(julian)) |
---|
| 136 | ENDELSE |
---|
[2] | 137 | |
---|
[9] | 138 | IF keyword_set(ndayspm) THEN BEGIN |
---|
| 139 | IF ndayspm EQ 1 THEN ndayspm = 30 |
---|
| 140 | ENDIF ELSE ndayspm = 30 |
---|
[2] | 141 | |
---|
[9] | 142 | ndayspm = long(ndayspm) |
---|
| 143 | Z = floor(julian) |
---|
| 144 | year = z/(12*ndayspm)+1 |
---|
| 145 | month = (z-(12*ndayspm)*(year-1))/ndayspm+1 |
---|
| 146 | day = z-(12*ndayspm)*(year-1)-ndayspm*(month-1) |
---|
| 147 | WHILE total(day LT 1) GT 0 DO BEGIN |
---|
| 148 | tochange = where(day LT 1) |
---|
| 149 | month[tochange] = month[tochange]-1 |
---|
| 150 | day[tochange] = day[tochange]+ndayspm |
---|
| 151 | ENDWHILE |
---|
| 152 | WHILE total(month LT 1) GT 0 DO BEGIN |
---|
| 153 | tochange = where(month LT 1) |
---|
| 154 | year[tochange] = year[tochange]-1 |
---|
| 155 | month[tochange] = month[tochange]+12 |
---|
| 156 | ENDWHILE |
---|
| 157 | ; year 0 does not exist... |
---|
| 158 | neg = where(year LT 0) |
---|
| 159 | IF neg[0] NE -1 THEN year[neg] = year[neg]-1 |
---|
| 160 | END |
---|
| 161 | 'noleap':BEGIN |
---|
[69] | 162 | |
---|
| 163 | jul = long(julian) |
---|
| 164 | year = jul/365 + 1 |
---|
| 165 | day = jul MOD 365L |
---|
| 166 | ; |
---|
| 167 | ; |
---|
| 168 | zero = where(day EQ 0) |
---|
| 169 | ; |
---|
| 170 | month = 1 + (day GT 31) + (day GT 59) + (day GT 90) + (day GT 120) $ |
---|
| 171 | + (day GT 151) + (day GT 181) + (day GT 212) + (day GT 243) $ |
---|
| 172 | + (day GT 273) + (day GT 304) + (day GT 334) |
---|
| 173 | month = long(month) |
---|
| 174 | ; |
---|
| 175 | day = day - 31L * (day GT 31) - 28L * (day GT 59) - 31L * (day GT 90) $ |
---|
| 176 | - 30L * (day GT 120) - 31L * (day GT 151) - 30L * (day GT 181) $ |
---|
| 177 | - 31L * (day GT 212) - 31L * (day GT 243) - 30L * (day GT 273) $ |
---|
| 178 | - 31L * (day GT 304) - 30L * (day GT 334) |
---|
| 179 | ; |
---|
| 180 | IF zero[0] NE -1 THEN BEGIN |
---|
| 181 | year[zero] = year[zero]-1 |
---|
| 182 | month[zero] = 12L |
---|
| 183 | day[zero] = 31L |
---|
| 184 | ENDIF |
---|
| 185 | |
---|
[9] | 186 | END |
---|
| 187 | ELSE:BEGIN |
---|
| 188 | ng = report('only 3 types of calendar are accepted: greg, 360d and noleap') |
---|
| 189 | return |
---|
| 190 | END |
---|
| 191 | ENDCASE |
---|
| 192 | ; |
---|
[69] | 193 | zero = where(year ge 600000L, cnt) |
---|
| 194 | IF cnt NE 0 THEN year[zero] = year[zero]-654321L |
---|
| 195 | ; |
---|
[9] | 196 | return |
---|
[2] | 197 | |
---|
[9] | 198 | END |
---|