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source: palm/trunk/SOURCE/palm_date_time_mod.f90 @ 4454

Last change on this file since 4454 was 4360, checked in by suehring, 5 years ago
Bugfix in output of time-averaged plant-canopy quanities; Output of plant-canopy data only where tall canopy is defined; land-surface model: fix wrong location strings; tests: update urban test case; all source code files: copyright update
Property svn:keywords set to `Id`
File size: 28.2 KB

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1	!> @file palm_date_time_mod.f90
2	!------------------------------------------------------------------------------!
3	! This file is part of the PALM model system.
4	!
5	! PALM is free software: you can redistribute it and/or modify it under the
6	! terms of the GNU General Public License as published by the Free Software
7	! Foundation, either version 3 of the License, or (at your option) any later
8	! version.
9	!
10	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
11	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
12	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
13	!
14	! You should have received a copy of the GNU General Public License along with
15	! PALM. If not, see <http://www.gnu.org/licenses/>.
16	!
17	! Copyright 1997-2020 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! ------------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: palm_date_time_mod.f90 4360 2020-01-07 11:25:50Z forkel $
27	! Add days of northward- and southward equinox
28	!
29	! 4227 2019-09-10 18:04:34Z gronemeier
30	! Complete rework of module date_and_time_mod:
31	! - renamed module to prevent confusion with
32	! FORTRAN Standard routine date_and_time
33	! - introduce date_time_type
34	! - add set_reference_date_time
35	! - add get_date_time
36	! - capsule whole calculation of date and time variables within this routine
37	! - removed all variables/routines not belonging to this module
38	!
39	!
40	! Authors:
41	! --------
42	!> @author Tobias Gronemeier (LUH)
43	!
44	! Description:
45	! ------------
46	!> This routine calculates all needed information on date and time used by
47	!> other modules
48	!>
49	!> @todo Consider leap seconds
50	!> @note Time_zone only supports full-hour time zones, i.e., time zones like
51	!> Australian Central Standard Time (UTC+9.5) are not possible
52	!------------------------------------------------------------------------------!
53	MODULE palm_date_time_mod
54
55	USE control_parameters, &
56	ONLY: message_string
57
58	USE kinds
59
60	IMPLICIT NONE
61
62	!
63	!-- Parameter Definition
64	INTEGER(iwp), PARAMETER :: date_time_str_len = 23_iwp !< length of date_time strings
65	INTEGER(iwp), PARAMETER :: days_per_week = 7_iwp !< days in a week
66	INTEGER(iwp), PARAMETER :: hours_per_day = 24_iwp !< hours in a day
67	INTEGER(iwp), PARAMETER :: minutes_per_hour = 60_iwp !< minutes in an hour
68	INTEGER(iwp), PARAMETER :: months_per_year = 12_iwp !< months in a year
69	!
70	!-- Definition of mean northward and southward equinox (summer and winter half year)
71	!-- in days of year. For simplicity, March 21 and September 21 is assumed.
72	INTEGER(iwp), PARAMETER :: northward_equinox = 80_iwp
73	INTEGER(iwp), PARAMETER :: southward_equinox = 264_iwp
74
75	REAL(wp), PARAMETER :: seconds_per_minute = 60.0_wp !< seconds in a minute
76	REAL(wp), PARAMETER :: seconds_per_hour = seconds_per_minute * minutes_per_hour !< seconds in an hour
77	REAL(wp), PARAMETER :: seconds_per_day = seconds_per_hour * hours_per_day !< seconds in a day
78
79	CHARACTER(LEN=3), DIMENSION(days_per_week), PARAMETER :: &
80	weekdays = (/"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"/) !< names of weekdays
81
82	INTEGER, DIMENSION(months_per_year), PARAMETER :: &
83	days_per_month_noleapyear = (/31,28,31,30,31,30,31,31,30,31,30,31/) !< days for each month (no leap year)
84
85	INTEGER, DIMENSION(months_per_year), PARAMETER :: &
86	days_per_month_leapyear = (/31,29,31,30,31,30,31,31,30,31,30,31/) !< days for each month (leap year)
87
88	INTEGER, DIMENSION(121), PARAMETER :: leap_years = & !< list of leap years
89	(/1804_iwp, 1808_iwp, 1812_iwp, 1816_iwp, 1820_iwp, 1824_iwp, 1828_iwp, 1832_iwp, &
90	1836_iwp, 1840_iwp, 1844_iwp, 1848_iwp, 1852_iwp, 1856_iwp, 1860_iwp, 1864_iwp, &
91	1868_iwp, 1872_iwp, 1876_iwp, 1880_iwp, 1884_iwp, 1888_iwp, 1892_iwp, 1896_iwp, &
92	1904_iwp, 1908_iwp, 1912_iwp, 1916_iwp, 1920_iwp, 1924_iwp, 1928_iwp, 1932_iwp, &
93	1936_iwp, 1940_iwp, 1944_iwp, 1948_iwp, 1952_iwp, 1956_iwp, 1960_iwp, 1964_iwp, &
94	1968_iwp, 1972_iwp, 1976_iwp, 1980_iwp, 1984_iwp, 1988_iwp, 1992_iwp, 1996_iwp, &
95	2000_iwp, 2004_iwp, 2008_iwp, 2012_iwp, 2016_iwp, 2020_iwp, 2024_iwp, 2028_iwp, &
96	2032_iwp, 2036_iwp, 2040_iwp, 2044_iwp, 2048_iwp, 2052_iwp, 2056_iwp, 2060_iwp, &
97	2064_iwp, 2068_iwp, 2072_iwp, 2076_iwp, 2080_iwp, 2084_iwp, 2088_iwp, 2092_iwp, &
98	2096_iwp, 2104_iwp, 2108_iwp, 2112_iwp, 2116_iwp, 2120_iwp, 2124_iwp, 2128_iwp, &
99	2132_iwp, 2136_iwp, 2140_iwp, 2144_iwp, 2148_iwp, 2152_iwp, 2156_iwp, 2160_iwp, &
100	2164_iwp, 2168_iwp, 2172_iwp, 2176_iwp, 2180_iwp, 2184_iwp, 2188_iwp, 2192_iwp, &
101	2196_iwp, 2204_iwp, 2208_iwp, 2212_iwp, 2216_iwp, 2220_iwp, 2224_iwp, 2228_iwp, &
102	2232_iwp, 2236_iwp, 2240_iwp, 2244_iwp, 2248_iwp, 2252_iwp, 2256_iwp, 2260_iwp, &
103	2264_iwp, 2268_iwp, 2272_iwp, 2276_iwp, 2280_iwp, 2284_iwp, 2288_iwp, 2292_iwp, &
104	2296_iwp /)
105
106	!
107	!-- Type Definition
108	TYPE date_time_type
109	INTEGER(iwp) :: year = -HUGE(0_iwp) !< year
110	INTEGER(iwp) :: month = -HUGE(0_iwp) !< month of year
111	INTEGER(iwp) :: day = -HUGE(0_iwp) !< day of month
112	INTEGER(iwp) :: hour = -HUGE(0_iwp) !< hour of day
113	INTEGER(iwp) :: minute = -HUGE(0_iwp) !< minute of hour
114	INTEGER(iwp) :: zone = -HUGE(0_iwp) !< time zone
115
116	REAL(wp) :: second = -HUGE(0.0_wp) !< second of minute
117	REAL(wp) :: second_of_year = -HUGE(0.0_wp) !< second of year
118
119	INTEGER(iwp) :: days_per_year = -HUGE(0_iwp) !< days within a year
120
121	INTEGER, DIMENSION(months_per_year) :: days_per_month = days_per_month_noleapyear !< list of total days per month
122	END TYPE date_time_type
123
124	!
125	!-- Variable Declaration
126	LOGICAL :: reference_date_time_is_set = .FALSE. !< true if reference_date_time is set
127
128	TYPE(date_time_type) :: reference_date_time !< reference date-time
129
130	SAVE
131
132	PRIVATE
133	!
134	!-- Set reference date and time
135	INTERFACE set_reference_date_time
136	MODULE PROCEDURE set_reference_date_time
137	END INTERFACE set_reference_date_time
138	!
139	!-- Return date and time information
140	INTERFACE get_date_time
141	MODULE PROCEDURE get_date_time
142	END INTERFACE get_date_time
143	!
144	!-- Public Interfaces
145	PUBLIC &
146	get_date_time, &
147	set_reference_date_time
148	!
149	!-- Public variables
150	PUBLIC &
151	date_time_str_len, &
152	days_per_week, &
153	hours_per_day, &
154	minutes_per_hour, &
155	months_per_year, &
156	northward_equinox, &
157	seconds_per_minute, &
158	seconds_per_hour, &
159	seconds_per_day, &
160	southward_equinox, &
161	weekdays
162
163	CONTAINS
164
165
166	!--------------------------------------------------------------------------------------------------!
167	! Description:
168	! ------------
169	!> Set reference date-time.
170	!> Only a single call is allowed to this routine during execution.
171	!--------------------------------------------------------------------------------------------------!
172	SUBROUTINE set_reference_date_time( date_time_str )
173
174	CHARACTER(LEN=date_time_str_len), INTENT(IN) :: date_time_str !< string containing date-time information
175
176	!
177	!-- Check if date and time are already set
178	IF ( reference_date_time_is_set ) THEN
179	!> @note This error should never be observed by a user.
180	!> It can only appear if the code was modified.
181	WRITE( message_string, * ) 'Multiple calls to set_reference_date_time detected.&' // &
182	'The reference date-time must be set only once.'
183	CALL message( 'set_reference_date_time', 'PA0680', 2, 2, 0, 6, 0 )
184	RETURN
185
186	ELSE
187
188	reference_date_time = convert_string_to_date_time( date_time_str )
189
190	reference_date_time_is_set = .TRUE.
191
192	ENDIF
193
194	END SUBROUTINE set_reference_date_time
195
196
197	!--------------------------------------------------------------------------------------------------!
198	! Description:
199	! ------------
200	!> Return requested date-time information of the reference time + time_since_reference.
201	!> An alternative reference date-time string can be specified via 'reference_date_time_str'.
202	!> Call to this routine is only possible if a reference time is either specified in the call itself
203	!> via 'reference_date_time_str' or previously set by calling routine 'set_reference_date_time'.
204	!--------------------------------------------------------------------------------------------------!
205	SUBROUTINE get_date_time( time_since_reference, reference_date_time_str, &
206	year, month, day, hour, minute, second, zone, &
207	second_of_day, second_of_year, &
208	day_of_year, day_of_week, weekday, date_time_str, &
209	days_per_month, days_per_year )
210
211	CHARACTER(LEN=date_time_str_len), INTENT(OUT), OPTIONAL :: date_time_str !< date-time as string
212	CHARACTER(LEN=1) :: plus_minus !< either '+' or '-'
213	CHARACTER(LEN=date_time_str_len), INTENT(IN), OPTIONAL :: reference_date_time_str !< alternative reference date-time
214	CHARACTER(LEN=3), INTENT(OUT), OPTIONAL :: weekday !< weekday
215
216	INTEGER(iwp), INTENT(OUT), OPTIONAL :: day !< day of month
217	INTEGER(iwp), INTENT(OUT), OPTIONAL :: day_of_week !< number of weekday
218	INTEGER(iwp), INTENT(OUT), OPTIONAL :: day_of_year !< day of the year
219	INTEGER(iwp), INTENT(OUT), OPTIONAL :: hour !< hour of day
220	INTEGER(iwp), INTENT(OUT), OPTIONAL :: minute !< minute of hour
221	INTEGER(iwp), INTENT(OUT), OPTIONAL :: month !< month of year
222	INTEGER(iwp), INTENT(OUT), OPTIONAL :: year !< year
223	INTEGER(iwp), INTENT(OUT), OPTIONAL :: zone !< time zone
224	INTEGER(iwp), INTENT(OUT), OPTIONAL :: days_per_year !< days per year
225	INTEGER(iwp), DIMENSION(months_per_year), INTENT(OUT), OPTIONAL :: days_per_month !< days per year
226
227	REAL(wp), INTENT(OUT), OPTIONAL :: second !< second of minute
228	REAL(wp), INTENT(OUT), OPTIONAL :: second_of_day !< second of day
229	REAL(wp), INTENT(OUT), OPTIONAL :: second_of_year !< second of year
230	REAL(wp), INTENT(IN) :: time_since_reference !< seconds between reference time and current time
231
232	TYPE(date_time_type) :: date_time !< date-time which to return
233	TYPE(date_time_type) :: internal_reference_date_time !< internal reference date-time
234
235	!
236	!-- Check if a reference date-time is given
237	IF ( .NOT. reference_date_time_is_set .AND. .NOT. PRESENT( reference_date_time_str ) ) THEN
238	!> @note This error should never be observed by a user.
239	!> It can only appear if the code was modified.
240	WRITE( message_string, * ) 'No reference date-time defined. '// &
241	'Returning date-time information is not possible. ' // &
242	'Either specify reference_date_time_str ' // &
243	'or set a reference via set_reference_date_time.'
244	CALL message( 'get_date_time', 'PA0677', 2, 2, 0, 6, 0 )
245	RETURN
246	ENDIF
247	!
248	!-- Set internal reference date-time
249	IF ( PRESENT( reference_date_time_str ) ) THEN
250	internal_reference_date_time = convert_string_to_date_time( reference_date_time_str )
251	ELSE
252	internal_reference_date_time = reference_date_time
253	ENDIF
254	!
255	!-- Add time to reference time
256	date_time = add_date_time( time_since_reference, internal_reference_date_time )
257	!
258	!-- Set requested return values
259	IF ( PRESENT( year ) ) year = date_time%year
260	IF ( PRESENT( month ) ) month = date_time%month
261	IF ( PRESENT( day ) ) day = date_time%day
262	IF ( PRESENT( hour ) ) hour = date_time%hour
263	IF ( PRESENT( minute ) ) minute = date_time%minute
264	IF ( PRESENT( second ) ) second = date_time%second
265	IF ( PRESENT( zone ) ) zone = date_time%zone
266	IF ( PRESENT( second_of_year ) ) second_of_year = date_time%second_of_year
267	IF ( PRESENT( second_of_day ) ) second_of_day = get_second_of_day( date_time )
268	IF ( PRESENT( day_of_year ) ) day_of_year = get_day_of_year( date_time )
269	IF ( PRESENT( day_of_week ) ) day_of_week = get_day_of_week( date_time )
270	IF ( PRESENT( weekday ) ) weekday = weekdays( get_day_of_week( date_time ) )
271	IF ( PRESENT( days_per_month ) ) days_per_month = date_time%days_per_month
272	IF ( PRESENT( days_per_year ) ) days_per_year = date_time%days_per_year
273
274	IF ( PRESENT( date_time_str ) ) THEN
275	IF ( date_time%zone < 0_iwp ) THEN
276	plus_minus = '-'
277	ELSE
278	plus_minus = '+'
279	ENDIF
280	WRITE( UNIT = date_time_str, &
281	FMT = '(I4,"-",I2.2,"-",I2.2,1X,I2.2,":",I2.2,":",I2.2,1X,A1,I2.2)' ) &
282	date_time%year, date_time%month, date_time%day, &
283	date_time%hour, date_time%minute, INT( date_time%second ), &
284	plus_minus, ABS( date_time%zone )
285	ENDIF
286
287	END SUBROUTINE get_date_time
288
289
290	!--------------------------------------------------------------------------------------------------!
291	! Description:
292	! ------------
293	!> Convert a date-time string into a date_time object.
294	!--------------------------------------------------------------------------------------------------!
295	FUNCTION convert_string_to_date_time( date_time_str ) RESULT( date_time )
296
297	CHARACTER(LEN=date_time_str_len), INTENT(IN) :: date_time_str !< date-time as string
298
299	INTEGER(iwp) :: read_status !< returned status of read command
300
301	TYPE(date_time_type) :: date_time !< requested date-time object
302
303	!
304	!-- Decompose string to date-time information
305	READ( UNIT = date_time_str( 1: 4), IOSTAT = read_status, FMT = '(I4)' ) date_time%year
306	IF ( read_status == 0 ) &
307	READ( UNIT = date_time_str( 6: 7), IOSTAT = read_status, FMT = '(I2)' ) date_time%month
308	IF ( read_status == 0 ) &
309	READ( UNIT = date_time_str( 9:10), IOSTAT = read_status, FMT = '(I2)' ) date_time%day
310	IF ( read_status == 0 ) &
311	READ( UNIT = date_time_str(12:13), IOSTAT = read_status, FMT = '(I2)' ) date_time%hour
312	IF ( read_status == 0 ) &
313	READ( UNIT = date_time_str(15:16), IOSTAT = read_status, FMT = '(I2)' ) date_time%minute
314	IF ( read_status == 0 ) &
315	READ( UNIT = date_time_str(18:19), IOSTAT = read_status, FMT = '(F2.0)' ) date_time%second
316	IF ( read_status == 0 ) &
317	READ( UNIT = date_time_str(21:23), IOSTAT = read_status, FMT = '(I3)' ) date_time%zone
318
319	IF ( read_status /= 0 ) THEN
320	WRITE( message_string, * ) 'Error while converting date-time string. ' // &
321	'Please check format of date-time string: "' // &
322	TRIM( date_time_str ) // '". ' // &
323	'Format must be "YYYY-MM-DD hh:mm:ss ZZZ".'
324	CALL message( 'convert_string_to_date_time', 'PA0678', 2, 2, 0, 6, 0 )
325	RETURN
326	ENDIF
327
328	date_time = update_leapyear_setting( date_time )
329
330	IF ( check_date( date_time, date_time_str ) == 0 ) THEN
331
332	date_time%second_of_year = get_second_of_year( date_time )
333
334	!
335	!-- Shift time to UTC and set zone to UTC
336	date_time = add_date_time( REAL( -1 * date_time%zone, KIND = wp ) &
337	* seconds_per_hour, &
338	date_time )
339	date_time%zone = 0_iwp
340	ENDIF
341
342	END FUNCTION convert_string_to_date_time
343
344
345	!--------------------------------------------------------------------------------------------------!
346	! Description:
347	! ------------
348	!> Add time increment (in seconds) to given date-time and return shifted date-time
349	!--------------------------------------------------------------------------------------------------!
350	FUNCTION add_date_time( inc_seconds, date_time_base ) RESULT( date_time )
351
352	INTEGER(iwp) :: i !< loop index
353
354	REAL(wp) :: seconds_left !< seconds which must still be added to new date-time
355	REAL(wp) :: seconds_per_year !< number of seconds in a year
356
357	REAL(wp), INTENT(IN) :: inc_seconds !< seconds to be added to date-time
358
359	TYPE(date_time_type) :: date_time !< shifted date-time
360	TYPE(date_time_type), INTENT(IN) :: date_time_base !< date-time to be shifted
361
362	!
363	!-- Define some parameters
364	date_time = date_time_base
365	seconds_per_year = REAL( date_time%days_per_year, KIND = wp ) * seconds_per_day
366	!
367	!-- Shift time
368	date_time%second_of_year = date_time%second_of_year + inc_seconds
369	!
370	!-- Check if year changes
371	!-- First, if year is reduced
372	DO WHILE ( date_time%second_of_year < 0.0_wp )
373	date_time%year = date_time%year - 1_iwp
374	date_time = update_leapyear_setting( date_time )
375	seconds_per_year = REAL( date_time%days_per_year * seconds_per_day, KIND = wp )
376	date_time%second_of_year = date_time%second_of_year + seconds_per_year
377	ENDDO
378	!
379	!-- Now, if year is increased
380	DO WHILE ( date_time%second_of_year > seconds_per_year )
381	date_time%year = date_time%year + 1_iwp
382	date_time = update_leapyear_setting( date_time )
383	date_time%second_of_year = date_time%second_of_year - seconds_per_year
384	seconds_per_year = REAL( date_time%days_per_year * seconds_per_day, KIND = wp )
385	ENDDO
386	!
387	!-- Based on updated year and second_of_year, update month, day, hour, minute, second
388	DO i = 1, months_per_year
389	IF ( date_time%second_of_year < SUM( date_time%days_per_month(1:i) ) * seconds_per_day ) &
390	THEN
391	date_time%month = i
392	seconds_left = date_time%second_of_year &
393	- REAL( SUM( date_time%days_per_month(1:i-1) ), KIND=wp ) &
394	* seconds_per_day
395	date_time%day = INT( seconds_left / seconds_per_day, KIND = iwp ) + 1_iwp
396	seconds_left = seconds_left &
397	- REAL( date_time%day - 1_iwp, KIND = wp ) * seconds_per_day
398	date_time%hour = INT( seconds_left / seconds_per_hour, KIND = iwp )
399	seconds_left = seconds_left - REAL( date_time%hour, KIND = wp ) * seconds_per_hour
400	date_time%minute = INT( seconds_left / seconds_per_minute, KIND = iwp )
401	date_time%second = seconds_left - REAL( date_time%minute, KIND = wp ) * seconds_per_minute
402	EXIT
403	ENDIF
404	ENDDO
405
406	END FUNCTION add_date_time
407
408
409	!--------------------------------------------------------------------------------------------------!
410	! Description:
411	! ------------
412	!> Return day of year of given date.
413	!--------------------------------------------------------------------------------------------------!
414	FUNCTION get_day_of_year( date_time ) RESULT( day_of_year )
415
416	INTEGER(iwp) :: day_of_year !< day of the year
417
418	TYPE(date_time_type), INTENT(IN) :: date_time !< date of which to calculate day of year
419	TYPE(date_time_type) :: date_time_internal !< internal copy of input date-time
420
421
422	date_time_internal = update_leapyear_setting( date_time )
423
424	day_of_year = date_time_internal%day &
425	+ SUM( date_time_internal%days_per_month(:date_time_internal%month-1) )
426
427	END FUNCTION get_day_of_year
428
429
430	!--------------------------------------------------------------------------------------------------!
431	! Description:
432	! ------------
433	!> Return second of day of given time.
434	!--------------------------------------------------------------------------------------------------!
435	FUNCTION get_second_of_day( date_time ) RESULT( second_of_day )
436
437	REAL(wp) :: second_of_day !< second of the day
438
439	TYPE(date_time_type), INTENT(IN) :: date_time !< date of which to calculate second of the day
440
441
442	second_of_day = date_time%second &
443	+ REAL( ( date_time%hour * minutes_per_hour ) + date_time%minute, KIND = wp ) &
444	* seconds_per_minute
445
446	END FUNCTION get_second_of_day
447
448
449	!--------------------------------------------------------------------------------------------------!
450	! Description:
451	! ------------
452	!> Return second of year of given date-time.
453	!--------------------------------------------------------------------------------------------------!
454	FUNCTION get_second_of_year( date_time ) RESULT( second_of_year )
455
456	REAL(wp) :: second_of_year !< second of the year
457
458	TYPE(date_time_type), INTENT(IN) :: date_time !< date of which to calculate second of the year
459
460
461	second_of_year = get_second_of_day( date_time ) &
462	+ REAL( get_day_of_year( date_time ) - 1_iwp, KIND = wp ) * seconds_per_day
463
464	END FUNCTION get_second_of_year
465
466
467	!--------------------------------------------------------------------------------------------------!
468	! Description:
469	! ------------
470	!> Return index of the day of the week of the given date-time.
471	!--------------------------------------------------------------------------------------------------!
472	FUNCTION get_day_of_week( date_time_in ) RESULT( day_of_week )
473
474	INTEGER(iwp) :: date_time_internal_reference_day_of_week !< day of week of reference date
475	INTEGER(iwp) :: day_difference !< day between given date and reference
476	INTEGER(iwp) :: day_of_week !< day of the week
477
478	TYPE(date_time_type), INTENT(IN) :: date_time_in !< date of which to get the weekday
479	TYPE(date_time_type) :: date_time_internal !< internal date-time
480
481	!
482	!-- Define reference date from which on the current day of week can be determined
483	date_time_internal%year = 2000_iwp
484	date_time_internal%month = 1_iwp
485	date_time_internal%day = 1_iwp
486	date_time_internal_reference_day_of_week = 6_iwp
487
488	!
489	!-- First, get the difference if both dates would be in the same year
490	day_difference = get_day_of_year( date_time_in ) - get_day_of_year( date_time_internal )
491	!
492	!-- Now, shift the year and add the corresponding number of days to the difference
493	IF ( date_time_internal%year < date_time_in%year ) THEN
494
495	DO WHILE ( date_time_internal%year /= date_time_in%year )
496
497	date_time_internal = update_leapyear_setting( date_time_internal )
498	day_difference = day_difference + date_time_internal%days_per_year
499
500	date_time_internal%year = date_time_internal%year + 1_iwp
501
502	ENDDO
503
504	ELSEIF ( date_time_internal%year > date_time_in%year ) THEN
505
506	DO WHILE ( date_time_internal%year /= date_time_in%year )
507
508	date_time_internal%year = date_time_internal%year - 1_iwp
509
510	date_time_internal = update_leapyear_setting( date_time_internal )
511	day_difference = day_difference - date_time_internal%days_per_year
512
513	ENDDO
514
515	ENDIF
516	!
517	!-- Remove full weeks of day_difference and shift day_of_week of reference by
518	!-- remaining days
519	day_of_week = date_time_internal_reference_day_of_week + MOD( day_difference, days_per_week )
520
521	IF ( day_of_week > days_per_week ) THEN
522	!
523	!-- Shift index again if it is next week (above days_per_week)...
524	day_of_week = day_of_week - days_per_week
525	ELSEIF ( day_of_week <= 0_iwp ) THEN
526	!
527	!-- ...or if it is last week (below 1)
528	day_of_week = day_of_week + days_per_week
529	ENDIF
530
531	END FUNCTION get_day_of_week
532
533
534	!--------------------------------------------------------------------------------------------------!
535	! Description:
536	! ------------
537	!> Check if given year is a leap year and update days per month accordingly.
538	!--------------------------------------------------------------------------------------------------!
539	FUNCTION update_leapyear_setting( date_time_in ) RESULT( date_time_out )
540
541	TYPE(date_time_type), INTENT(IN) :: date_time_in !< input date-time
542	TYPE(date_time_type) :: date_time_out !< return date-time
543
544
545	date_time_out = date_time_in
546
547	IF ( ANY( date_time_in%year == leap_years ) ) THEN
548	date_time_out%days_per_month = days_per_month_leapyear
549	ELSE
550	date_time_out%days_per_month = days_per_month_noleapyear
551	ENDIF
552
553	date_time_out%days_per_year = SUM( date_time_out%days_per_month )
554
555	END FUNCTION update_leapyear_setting
556
557
558	!--------------------------------------------------------------------------------------------------!
559	! Description:
560	! ------------
561	!> Check if given date and time are valid. Returns 0 if all checks are passed.
562	!> @todo Revise error message. ATM, gives only last errorneous value even if
563	!> multiple values violate the bounds.
564	!--------------------------------------------------------------------------------------------------!
565	FUNCTION check_date( date_time, date_time_str ) RESULT( error_code )
566
567
568	CHARACTER(LEN=6), DIMENSION(7), PARAMETER :: error_str_list = & !< string used for error message
569	(/'year ', 'month ', 'day ', 'hour ', 'minute', 'second', 'zone '/)
570
571	CHARACTER(LEN=date_time_str_len), INTENT(IN) :: date_time_str !< date-time as string
572
573	INTEGER(iwp) :: error_code !< error code
574
575	TYPE(date_time_type), INTENT(IN) :: date_time !< date-time to be checked
576
577
578	error_code = 0
579	!
580	!-- Check date
581	IF ( date_time%month < 1_iwp .OR. &
582	date_time%month > months_per_year ) THEN
583	error_code = 2
584	ELSE
585	IF ( date_time%day < 1_iwp .OR. &
586	date_time%day > date_time%days_per_month(date_time%month) ) THEN
587	error_code = 3
588	ENDIF
589	ENDIF
590	!
591	!-- Check time
592	IF ( date_time%hour < 0_iwp .OR. &
593	date_time%hour > hours_per_day ) THEN
594	error_code = 4
595	ELSE
596	IF ( date_time%minute < 0_iwp .OR. &
597	date_time%minute > minutes_per_hour ) THEN
598	error_code = 5
599	ELSE
600	IF ( date_time%second < 0.0_wp .OR. &
601	date_time%second >= seconds_per_minute ) THEN
602	error_code = 6
603	ENDIF
604	ENDIF
605	ENDIF
606	!
607	!-- Check time zone
608	!-- Bounds defined by maximum and minimum time zone present on earth
609	IF ( date_time%zone < -12_iwp .OR. &
610	date_time%zone > 14_iwp ) THEN
611	error_code = 7
612	ENDIF
613	!
614	!-- Raise error if any check is marked invalid
615	IF ( error_code /= 0 ) THEN
616	WRITE( message_string, * ) 'Date-time values out of bounds: "' // &
617	TRIM( error_str_list(error_code) ) // &
618	'" is out of bounds. Please check date-time string: "' // &
619	TRIM( date_time_str ) // '". ' // &
620	'Format must be "YYYY-MM-DD hh:mm:ss ZZZ".'
621	CALL message( 'check_date', 'PA0679', 2, 2, 0, 6, 0 )
622	RETURN
623	ENDIF
624
625	END FUNCTION check_date
626
627	END MODULE palm_date_time_mod

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