1 | ;------------------------------------------------------------ |
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2 | ;------------------------------------------------------------ |
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3 | ;------------------------------------------------------------ |
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4 | ;+ |
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5 | ; |
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6 | ; @file_comments |
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7 | ; give the number of days in a specific month |
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8 | ; |
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9 | ; @categories |
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10 | ; Calendar |
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11 | ; |
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12 | ; @param YEAR {in}{optional}{default=from "time" common variable of cm_4cal} |
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13 | ; To specify the year of the month. Used only if the common variable |
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14 | ; key_caltype = 'greg'. In that case, month and year must have the same |
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15 | ; number of elements. |
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16 | ; |
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17 | ; @param MONTH |
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18 | ; |
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19 | ; @returns |
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20 | ; number of days in a month or -1 in case of error |
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21 | ; |
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22 | ; @uses |
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23 | ; cm_4cal, updatenew |
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24 | ; |
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25 | ; @examples |
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26 | ; IDL> ndays = daysinmonth(2, 2000) |
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27 | ; |
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28 | ; @history |
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29 | ; Sebastien Masson (smasson\@lodyc.jussieu.fr) |
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30 | ; 2/7/98 |
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31 | ; update/review/english/new commons: June 2005 Sebastien Masson. |
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32 | ; |
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33 | ; @version |
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34 | ; $Id$ |
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35 | ; |
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36 | ;- |
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37 | ;------------------------------------------------------------ |
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38 | ;------------------------------------------------------------ |
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39 | ;------------------------------------------------------------ |
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40 | function daysinmonth, month, year |
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41 | ;------------------------------------------------------------ |
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42 | ; include commons |
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43 | ; |
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44 | compile_opt idl2, strictarrsubs |
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45 | ; |
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46 | @cm_4cal |
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47 | IF NOT keyword_set(key_forgetold) THEN BEGIN |
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48 | @updatenew |
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49 | ENDIF |
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50 | ;------------------------------------------------------------ |
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51 | IF n_elements(key_caltype) EQ 0 THEN key_caltype = 'greg' |
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52 | CASE key_caltype OF |
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53 | '360d': if n_elements(month) GT 1 THEN $ |
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54 | return, replicate(30, n_elements(month)) ELSE return, 30 |
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55 | 'noleap':BEGIN |
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56 | days_in_mth = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31] |
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57 | IF n_elements(month) EQ 0 THEN caldat, time, month |
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58 | return, days_in_mth[month-1] |
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59 | END |
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60 | 'greg':BEGIN |
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61 | CASE n_params() OF |
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62 | 0:caldat, time, month, day, year |
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63 | 2:IF n_elements(month) NE n_elements(year) THEN $ |
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64 | return, report('month and year must have the same number of elements') |
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65 | ELSE:return, report('daysinmonth accept 0 or 2 input parameters') |
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66 | ENDCASE |
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67 | days_in_mth = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31] |
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68 | return, days_in_mth[month-1] + leapyr(year)*(month EQ 2) |
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69 | END |
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70 | ELSE:return, report('only 3 types of calendar are accepted: greg, 360d and noleap') |
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71 | ENDCASE |
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72 | |
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73 | END |
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