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source: palm/trunk/SOURCE/palm_date_time_mod.f90 @ 4798

Last change on this file since 4798 was 4797, checked in by raasch, 4 years ago
files re-formatted to follow the PALM coding standard
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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 terms of the GNU General
6	! Public License as published by the Free Software Foundation, either version 3 of the License, or
7	! (at your option) any later version.
8	!
9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
10	! implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
11	! Public License for more details.
12	!
13	! You should have received a copy of the GNU General Public License along with PALM. If not, see
14	! <http://www.gnu.org/licenses/>.
15	!
16	! Copyright 1997-2020 Leibniz Universitaet Hannover
17	!--------------------------------------------------------------------------------------------------!
18	!
19	! Current revisions:
20	! ------------------
21	!
22	!
23	! Former revisions:
24	! -----------------
25	! $Id: palm_date_time_mod.f90 4797 2020-11-26 16:02:39Z schwenkel $
26	! file re-formatted to follow the PALM coding standard
27	!
28	! 4680 2020-09-16 10:20:34Z gronemeier
29	! Add option to fix date and time; renamed set_reference_date_time to init_date_time
30	!
31	! 4360 2020-01-07 11:25:50Z suehring
32	! Add days of northward- and southward equinox
33	!
34	! 4227 2019-09-10 18:04:34Z gronemeier
35	! Complete rework of module date_and_time_mod:
36	! - renamed module to prevent confusion with FORTRAN Standard routine date_and_time
37	! - introduce date_time_type
38	! - add set_reference_date_time
39	! - add get_date_time
40	! - capsule whole calculation of date and time variables within this routine
41	! - removed all variables/routines not belonging to this module
42	!
43	!
44	! Authors:
45	! --------
46	!> @author Tobias Gronemeier (LUH)
47	!
48	! Description:
49	! ------------
50	!> This routine calculates all needed information on date and time used by other modules
51	!>
52	!> @todo Consider leap seconds
53	!> @note Time_zone only supports full-hour time zones, i.e., time zones like Australian Central
54	!> Standard Time (UTC+9.5) are not possible
55	!--------------------------------------------------------------------------------------------------!
56	MODULE palm_date_time_mod
57
58	USE control_parameters, &
59	ONLY: message_string
60
61	USE kinds
62
63	IMPLICIT NONE
64
65	!
66	!-- Parameter Definition
67	INTEGER(iwp), PARAMETER :: date_time_str_len = 23_iwp !< length of date_time strings
68	INTEGER(iwp), PARAMETER :: days_per_week = 7_iwp !< days in a week
69	INTEGER(iwp), PARAMETER :: hours_per_day = 24_iwp !< hours in a day
70	INTEGER(iwp), PARAMETER :: minutes_per_hour = 60_iwp !< minutes in an hour
71	INTEGER(iwp), PARAMETER :: months_per_year = 12_iwp !< months in a year
72	!
73	!-- Day of year of the mean northward and southward equinox (summer and winter half year)
74	INTEGER(iwp), PARAMETER :: northward_equinox = 80_iwp !< Mar 21 (leap year: Mar 20)
75	INTEGER(iwp), PARAMETER :: southward_equinox = 264_iwp !< Sep 21 (leap year: Sep 20)
76
77	CHARACTER(LEN=3), DIMENSION(days_per_week), PARAMETER :: &
78	weekdays = (/"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"/) !< names of weekdays
79
80	INTEGER, DIMENSION(months_per_year), PARAMETER :: &
81	days_per_month_noleapyear = (/31,28,31,30,31,30,31,31,30,31,30,31/) !< days for each month (no leap year)
82
83	INTEGER, DIMENSION(months_per_year), PARAMETER :: &
84	days_per_month_leapyear = (/31,29,31,30,31,30,31,31,30,31,30,31/) !< days for each month (leap year)
85
86	INTEGER, DIMENSION(121), PARAMETER :: leap_years = & !< list of leap years
87	(/ 1804_iwp, 1808_iwp, 1812_iwp, 1816_iwp, 1820_iwp, 1824_iwp, 1828_iwp, 1832_iwp, &
88	1836_iwp, 1840_iwp, 1844_iwp, 1848_iwp, 1852_iwp, 1856_iwp, 1860_iwp, 1864_iwp, &
89	1868_iwp, 1872_iwp, 1876_iwp, 1880_iwp, 1884_iwp, 1888_iwp, 1892_iwp, 1896_iwp, &
90	1904_iwp, 1908_iwp, 1912_iwp, 1916_iwp, 1920_iwp, 1924_iwp, 1928_iwp, 1932_iwp, &
91	1936_iwp, 1940_iwp, 1944_iwp, 1948_iwp, 1952_iwp, 1956_iwp, 1960_iwp, 1964_iwp, &
92	1968_iwp, 1972_iwp, 1976_iwp, 1980_iwp, 1984_iwp, 1988_iwp, 1992_iwp, 1996_iwp, &
93	2000_iwp, 2004_iwp, 2008_iwp, 2012_iwp, 2016_iwp, 2020_iwp, 2024_iwp, 2028_iwp, &
94	2032_iwp, 2036_iwp, 2040_iwp, 2044_iwp, 2048_iwp, 2052_iwp, 2056_iwp, 2060_iwp, &
95	2064_iwp, 2068_iwp, 2072_iwp, 2076_iwp, 2080_iwp, 2084_iwp, 2088_iwp, 2092_iwp, &
96	2096_iwp, 2104_iwp, 2108_iwp, 2112_iwp, 2116_iwp, 2120_iwp, 2124_iwp, 2128_iwp, &
97	2132_iwp, 2136_iwp, 2140_iwp, 2144_iwp, 2148_iwp, 2152_iwp, 2156_iwp, 2160_iwp, &
98	2164_iwp, 2168_iwp, 2172_iwp, 2176_iwp, 2180_iwp, 2184_iwp, 2188_iwp, 2192_iwp, &
99	2196_iwp, 2204_iwp, 2208_iwp, 2212_iwp, 2216_iwp, 2220_iwp, 2224_iwp, 2228_iwp, &
100	2232_iwp, 2236_iwp, 2240_iwp, 2244_iwp, 2248_iwp, 2252_iwp, 2256_iwp, 2260_iwp, &
101	2264_iwp, 2268_iwp, 2272_iwp, 2276_iwp, 2280_iwp, 2284_iwp, 2288_iwp, 2292_iwp, &
102	2296_iwp /)
103
104	REAL(wp), PARAMETER :: seconds_per_minute = 60.0_wp !< seconds in a minute
105	REAL(wp), PARAMETER :: seconds_per_hour = seconds_per_minute * minutes_per_hour !< seconds in an hour
106	REAL(wp), PARAMETER :: seconds_per_day = seconds_per_hour * hours_per_day !< seconds in a day
107
108	!
109	!-- Type Definition
110	TYPE date_time_type
111	INTEGER(iwp) :: year = -HUGE(0_iwp) !< year
112	INTEGER(iwp) :: month = -HUGE(0_iwp) !< month of year
113	INTEGER(iwp) :: day = -HUGE(0_iwp) !< day of month
114	INTEGER(iwp) :: hour = -HUGE(0_iwp) !< hour of day
115	INTEGER(iwp) :: minute = -HUGE(0_iwp) !< minute of hour
116	INTEGER(iwp) :: zone = -HUGE(0_iwp) !< time zone
117
118	REAL(wp) :: second = -HUGE(0.0_wp) !< second of minute
119	REAL(wp) :: second_of_year = -HUGE(0.0_wp) !< second of year
120
121	INTEGER(iwp) :: days_per_year = -HUGE(0_iwp) !< days within a year
122
123	INTEGER, DIMENSION(months_per_year) :: days_per_month = days_per_month_noleapyear !< list of total days per month
124	END TYPE date_time_type
125
126	!
127	!-- Variable Declaration
128	LOGICAL :: date_is_fixed = .FALSE. !< if true, date is fixed (time can still change)
129	LOGICAL :: reference_date_time_is_set = .FALSE. !< true if reference_date_time is set
130	LOGICAL :: time_is_fixed = .FALSE. !< if true, time does not change at all
131
132	TYPE(date_time_type) :: reference_date_time !< reference date-time
133
134	SAVE
135
136	PRIVATE
137	!
138	!-- Set reference date and time
139	INTERFACE init_date_time
140	MODULE PROCEDURE init_date_time
141	END INTERFACE init_date_time
142	!
143	!-- Return date and time information
144	INTERFACE get_date_time
145	MODULE PROCEDURE get_date_time
146	END INTERFACE get_date_time
147	!
148	!-- Public Interfaces
149	PUBLIC &
150	get_date_time, &
151	init_date_time
152	!
153	!-- Public variables
154	PUBLIC &
155	date_time_str_len, &
156	days_per_week, &
157	hours_per_day, &
158	minutes_per_hour, &
159	months_per_year, &
160	northward_equinox, &
161	seconds_per_minute, &
162	seconds_per_hour, &
163	seconds_per_day, &
164	southward_equinox, &
165	weekdays
166
167	CONTAINS
168
169
170	!--------------------------------------------------------------------------------------------------!
171	! Description:
172	! ------------
173	!> Initialize date-time setting by defining a global reference date-time and choosing a variable or
174	!> fixed date.
175	!> Only a single call is allowed to this routine during execution.
176	!--------------------------------------------------------------------------------------------------!
177	SUBROUTINE init_date_time( date_time_str, use_fixed_date, use_fixed_time )
178
179	CHARACTER(LEN=date_time_str_len), INTENT(IN) :: date_time_str !< string containing date-time information
180
181	LOGICAL, INTENT(IN), OPTIONAL :: use_fixed_date !< flag to fix date
182	LOGICAL, INTENT(IN), OPTIONAL :: use_fixed_time !< flag to fix time
183
184	!
185	!-- Check if date and time are already set
186	IF ( reference_date_time_is_set ) THEN
187	!> @note This error should never be observed by a user.
188	!> It can only appear if the code was modified.
189	WRITE( message_string, * ) 'Multiple calls to init_date_time detected.&' // &
190	'This routine must not be called more than once.'
191	CALL message( 'init_date_time', 'PA0680', 2, 2, 0, 6, 0 )
192	RETURN
193
194	ELSE
195
196	reference_date_time = convert_string_to_date_time( date_time_str )
197
198	reference_date_time_is_set = .TRUE.
199
200	IF ( PRESENT( use_fixed_date ) ) date_is_fixed = use_fixed_date
201	IF ( PRESENT( use_fixed_time ) ) time_is_fixed = use_fixed_time
202
203	ENDIF
204
205	END SUBROUTINE init_date_time
206
207
208	!--------------------------------------------------------------------------------------------------!
209	! Description:
210	! ------------
211	!> Return requested date-time information of the reference time + time_since_reference.
212	!> An alternative reference date-time string can be specified via 'reference_date_time_str'.
213	!> Call to this routine is only possible if a reference time is either specified in the call itself
214	!> via 'reference_date_time_str' or previously set by calling routine 'init_date_time'.
215	!--------------------------------------------------------------------------------------------------!
216	SUBROUTINE get_date_time( time_since_reference, reference_date_time_str, year, month, day, hour, &
217	minute, second, zone, second_of_day, second_of_year, day_of_year, &
218	day_of_week, weekday, date_time_str, days_per_month, days_per_year )
219
220	CHARACTER(LEN=date_time_str_len), INTENT(OUT), OPTIONAL :: date_time_str !< date-time as string
221	CHARACTER(LEN=1) :: plus_minus !< either '+' or '-'
222	CHARACTER(LEN=date_time_str_len), INTENT(IN), OPTIONAL :: reference_date_time_str !< alternative reference date-time
223	CHARACTER(LEN=3), INTENT(OUT), OPTIONAL :: weekday !< weekday
224
225	INTEGER(iwp), INTENT(OUT), OPTIONAL :: day !< day of month
226	INTEGER(iwp), INTENT(OUT), OPTIONAL :: day_of_week !< number of weekday
227	INTEGER(iwp), INTENT(OUT), OPTIONAL :: day_of_year !< day of the year
228	INTEGER(iwp), INTENT(OUT), OPTIONAL :: days_per_year !< days per year
229	INTEGER(iwp), INTENT(OUT), OPTIONAL :: hour !< hour of day
230	INTEGER(iwp), INTENT(OUT), OPTIONAL :: minute !< minute of hour
231	INTEGER(iwp), INTENT(OUT), OPTIONAL :: month !< month of year
232	INTEGER(iwp), INTENT(OUT), OPTIONAL :: year !< year
233	INTEGER(iwp), INTENT(OUT), OPTIONAL :: zone !< time zone
234
235	INTEGER(iwp), DIMENSION(months_per_year), INTENT(OUT), OPTIONAL :: days_per_month !< days per year
236
237	REAL(wp), INTENT(OUT), OPTIONAL :: second !< second of minute
238	REAL(wp), INTENT(OUT), OPTIONAL :: second_of_day !< second of day
239	REAL(wp), INTENT(OUT), OPTIONAL :: second_of_year !< second of year
240	REAL(wp), INTENT(IN) :: time_since_reference !< seconds between reference time and current time
241
242	TYPE(date_time_type) :: date_time !< date-time which to return
243	TYPE(date_time_type) :: internal_reference_date_time !< internal reference date-time
244
245	!
246	!-- Check if a reference date-time is given
247	IF ( .NOT. reference_date_time_is_set .AND. .NOT. PRESENT( reference_date_time_str ) ) THEN
248	!> @note This error should never be observed by a user.
249	!> It can only appear if the code was modified.
250	WRITE( message_string, * ) 'No reference date-time defined. '// &
251	'Returning date-time information is not possible. ' // &
252	'Either specify reference_date_time_str ' // &
253	'or set a reference via init_date_time.'
254	CALL message( 'get_date_time', 'PA0677', 2, 2, 0, 6, 0 )
255	RETURN
256	ENDIF
257	!
258	!-- Set internal reference date-time
259	IF ( PRESENT( reference_date_time_str ) ) THEN
260	internal_reference_date_time = convert_string_to_date_time( reference_date_time_str )
261	ELSE
262	internal_reference_date_time = reference_date_time
263	ENDIF
264
265	IF ( time_is_fixed ) THEN
266	!
267	!-- If time shall not change, set new time to reference time
268	date_time = internal_reference_date_time
269	ELSE
270	!
271	!-- Add time to reference time
272	date_time = add_date_time( time_since_reference, internal_reference_date_time )
273	!
274	!-- If date shall be fixed, revert it to the reference date if changed
275	IF ( date_is_fixed ) THEN
276	IF ( date_time%year /= internal_reference_date_time%year .OR. &
277	get_day_of_year( date_time ) /= get_day_of_year( internal_reference_date_time ) ) &
278	THEN
279
280	date_time%year = internal_reference_date_time%year
281	date_time%month = internal_reference_date_time%month
282	date_time%day = internal_reference_date_time%day
283	date_time = update_leapyear_setting( date_time )
284	date_time%second_of_year = get_second_of_year( date_time )
285
286	ENDIF
287	ENDIF
288	ENDIF
289	!
290	!-- Set requested return values
291	IF ( PRESENT( year ) ) year = date_time%year
292	IF ( PRESENT( month ) ) month = date_time%month
293	IF ( PRESENT( day ) ) day = date_time%day
294	IF ( PRESENT( hour ) ) hour = date_time%hour
295	IF ( PRESENT( minute ) ) minute = date_time%minute
296	IF ( PRESENT( second ) ) second = date_time%second
297	IF ( PRESENT( zone ) ) zone = date_time%zone
298	IF ( PRESENT( second_of_year ) ) second_of_year = date_time%second_of_year
299	IF ( PRESENT( second_of_day ) ) second_of_day = get_second_of_day( date_time )
300	IF ( PRESENT( day_of_year ) ) day_of_year = get_day_of_year( date_time )
301	IF ( PRESENT( day_of_week ) ) day_of_week = get_day_of_week( date_time )
302	IF ( PRESENT( weekday ) ) weekday = weekdays( get_day_of_week( date_time ) )
303	IF ( PRESENT( days_per_month ) ) days_per_month = date_time%days_per_month
304	IF ( PRESENT( days_per_year ) ) days_per_year = date_time%days_per_year
305
306	IF ( PRESENT( date_time_str ) ) THEN
307	IF ( date_time%zone < 0_iwp ) THEN
308	plus_minus = '-'
309	ELSE
310	plus_minus = '+'
311	ENDIF
312	WRITE( UNIT = date_time_str, &
313	FMT = '(I4,"-",I2.2,"-",I2.2,1X,I2.2,":",I2.2,":",I2.2,1X,A1,I2.2)' ) &
314	date_time%year, date_time%month, date_time%day, &
315	date_time%hour, date_time%minute, INT( date_time%second ), &
316	plus_minus, ABS( date_time%zone )
317	ENDIF
318
319	END SUBROUTINE get_date_time
320
321
322	!--------------------------------------------------------------------------------------------------!
323	! Description:
324	! ------------
325	!> Convert a date-time string into a date_time object.
326	!--------------------------------------------------------------------------------------------------!
327	FUNCTION convert_string_to_date_time( date_time_str ) RESULT( date_time )
328
329	CHARACTER(LEN=date_time_str_len), INTENT(IN) :: date_time_str !< date-time as string
330
331	INTEGER(iwp) :: read_status !< returned status of read command
332
333	TYPE(date_time_type) :: date_time !< requested date-time object
334
335	!
336	!-- Decompose string to date-time information
337	READ( UNIT = date_time_str( 1: 4), IOSTAT = read_status, FMT = '(I4)' ) date_time%year
338	IF ( read_status == 0 ) THEN
339	READ( UNIT = date_time_str( 6: 7), IOSTAT = read_status, FMT = '(I2)' ) date_time%month
340	ENDIF
341	IF ( read_status == 0 ) THEN
342	READ( UNIT = date_time_str( 9:10), IOSTAT = read_status, FMT = '(I2)' ) date_time%day
343	ENDIF
344	IF ( read_status == 0 ) THEN
345	READ( UNIT = date_time_str(12:13), IOSTAT = read_status, FMT = '(I2)' ) date_time%hour
346	ENDIF
347	IF ( read_status == 0 ) THEN
348	READ( UNIT = date_time_str(15:16), IOSTAT = read_status, FMT = '(I2)' ) date_time%minute
349	ENDIF
350	IF ( read_status == 0 ) THEN
351	READ( UNIT = date_time_str(18:19), IOSTAT = read_status, FMT = '(F2.0)' ) date_time%second
352	ENDIF
353	IF ( read_status == 0 ) THEN
354	READ( UNIT = date_time_str(21:23), IOSTAT = read_status, FMT = '(I3)' ) date_time%zone
355	ENDIF
356
357	IF ( read_status /= 0 ) THEN
358	WRITE( message_string, * ) 'Error while converting date-time string. ' // &
359	'Please check format of date-time string: "' // &
360	TRIM( date_time_str ) // '". ' // &
361	'Format must be "YYYY-MM-DD hh:mm:ss ZZZ".'
362	CALL message( 'convert_string_to_date_time', 'PA0678', 2, 2, 0, 6, 0 )
363	RETURN
364	ENDIF
365
366	date_time = update_leapyear_setting( date_time )
367
368	IF ( check_date( date_time, date_time_str ) == 0 ) THEN
369
370	date_time%second_of_year = get_second_of_year( date_time )
371
372	!
373	!-- Shift time to UTC and set zone to UTC
374	date_time = add_date_time( REAL( -1 * date_time%zone, KIND = wp ) * seconds_per_hour, &
375	date_time )
376	date_time%zone = 0_iwp
377	ENDIF
378
379	END FUNCTION convert_string_to_date_time
380
381
382	!--------------------------------------------------------------------------------------------------!
383	! Description:
384	! ------------
385	!> Add time increment (in seconds) to given date-time and return shifted date-time
386	!--------------------------------------------------------------------------------------------------!
387	FUNCTION add_date_time( inc_seconds, date_time_base ) RESULT( date_time )
388
389	INTEGER(iwp) :: i !< loop index
390
391	REAL(wp) :: seconds_left !< seconds which must still be added to new date-time
392	REAL(wp) :: seconds_per_year !< number of seconds in a year
393
394	REAL(wp), INTENT(IN) :: inc_seconds !< seconds to be added to date-time
395
396	TYPE(date_time_type) :: date_time !< shifted date-time
397	TYPE(date_time_type), INTENT(IN) :: date_time_base !< date-time to be shifted
398
399	!
400	!-- Define some parameters
401	date_time = date_time_base
402	seconds_per_year = REAL( date_time%days_per_year, KIND = wp ) * seconds_per_day
403	!
404	!-- Shift time
405	date_time%second_of_year = date_time%second_of_year + inc_seconds
406	!
407	!-- Check if year changes.
408	!-- First, if year is reduced
409	DO WHILE ( date_time%second_of_year < 0.0_wp )
410	date_time%year = date_time%year - 1_iwp
411	date_time = update_leapyear_setting( date_time )
412	seconds_per_year = REAL( date_time%days_per_year * seconds_per_day, KIND = wp )
413	date_time%second_of_year = date_time%second_of_year + seconds_per_year
414	ENDDO
415	!
416	!-- Now, if year is increased
417	DO WHILE ( date_time%second_of_year > seconds_per_year )
418	date_time%year = date_time%year + 1_iwp
419	date_time = update_leapyear_setting( date_time )
420	date_time%second_of_year = date_time%second_of_year - seconds_per_year
421	seconds_per_year = REAL( date_time%days_per_year * seconds_per_day, KIND = wp )
422	ENDDO
423	!
424	!-- Based on updated year and second_of_year, update month, day, hour, minute, second
425	DO i = 1, months_per_year
426	IF ( date_time%second_of_year < SUM( date_time%days_per_month(1:i) ) * seconds_per_day ) &
427	THEN
428	date_time%month = i
429	seconds_left = date_time%second_of_year &
430	- REAL( SUM( date_time%days_per_month(1:i-1) ), KIND=wp ) &
431	* seconds_per_day
432	date_time%day = INT( seconds_left / seconds_per_day, KIND = iwp ) + 1_iwp
433	seconds_left = seconds_left &
434	- REAL( date_time%day - 1_iwp, KIND = wp ) * seconds_per_day
435	date_time%hour = INT( seconds_left / seconds_per_hour, KIND = iwp )
436	seconds_left = seconds_left - REAL( date_time%hour, KIND = wp ) * seconds_per_hour
437	date_time%minute = INT( seconds_left / seconds_per_minute, KIND = iwp )
438	date_time%second = seconds_left - REAL( date_time%minute, KIND = wp ) * seconds_per_minute
439	EXIT
440	ENDIF
441	ENDDO
442
443	END FUNCTION add_date_time
444
445
446	!--------------------------------------------------------------------------------------------------!
447	! Description:
448	! ------------
449	!> Return day of year of given date.
450	!--------------------------------------------------------------------------------------------------!
451	FUNCTION get_day_of_year( date_time ) RESULT( day_of_year )
452
453	INTEGER(iwp) :: day_of_year !< day of the year
454
455	TYPE(date_time_type), INTENT(IN) :: date_time !< date of which to calculate day of year
456	TYPE(date_time_type) :: date_time_internal !< internal copy of input date-time
457
458
459	date_time_internal = update_leapyear_setting( date_time )
460
461	day_of_year = date_time_internal%day &
462	+ SUM( date_time_internal%days_per_month(:date_time_internal%month-1) )
463
464	END FUNCTION get_day_of_year
465
466
467	!--------------------------------------------------------------------------------------------------!
468	! Description:
469	! ------------
470	!> Return second of day of given time.
471	!--------------------------------------------------------------------------------------------------!
472	FUNCTION get_second_of_day( date_time ) RESULT( second_of_day )
473
474	REAL(wp) :: second_of_day !< second of the day
475
476	TYPE(date_time_type), INTENT(IN) :: date_time !< date of which to calculate second of the day
477
478
479	second_of_day = date_time%second &
480	+ REAL( ( date_time%hour * minutes_per_hour ) + date_time%minute, KIND = wp ) &
481	* seconds_per_minute
482
483	END FUNCTION get_second_of_day
484
485
486	!--------------------------------------------------------------------------------------------------!
487	! Description:
488	! ------------
489	!> Return second of year of given date-time.
490	!--------------------------------------------------------------------------------------------------!
491	FUNCTION get_second_of_year( date_time ) RESULT( second_of_year )
492
493	REAL(wp) :: second_of_year !< second of the year
494
495	TYPE(date_time_type), INTENT(IN) :: date_time !< date of which to calculate second of the year
496
497
498	second_of_year = get_second_of_day( date_time ) &
499	+ REAL( get_day_of_year( date_time ) - 1_iwp, KIND = wp ) * seconds_per_day
500
501	END FUNCTION get_second_of_year
502
503
504	!--------------------------------------------------------------------------------------------------!
505	! Description:
506	! ------------
507	!> Return index of the day of the week of the given date-time.
508	!--------------------------------------------------------------------------------------------------!
509	FUNCTION get_day_of_week( date_time_in ) RESULT( day_of_week )
510
511	INTEGER(iwp) :: day_difference !< day between given date and reference
512	INTEGER(iwp) :: day_of_week !< day of the week
513	INTEGER(iwp) :: date_time_internal_reference_day_of_week !< day of week of reference date
514
515	TYPE(date_time_type), INTENT(IN) :: date_time_in !< date of which to get the weekday
516	TYPE(date_time_type) :: date_time_internal !< internal date-time
517
518	!
519	!-- Define reference date from which on the current day of week can be determined
520	date_time_internal%year = 2000_iwp
521	date_time_internal%month = 1_iwp
522	date_time_internal%day = 1_iwp
523	date_time_internal_reference_day_of_week = 6_iwp
524
525	!
526	!-- First, get the difference if both dates would be in the same year
527	day_difference = get_day_of_year( date_time_in ) - get_day_of_year( date_time_internal )
528	!
529	!-- Now, shift the year and add the corresponding number of days to the difference
530	IF ( date_time_internal%year < date_time_in%year ) THEN
531
532	DO WHILE ( date_time_internal%year /= date_time_in%year )
533
534	date_time_internal = update_leapyear_setting( date_time_internal )
535	day_difference = day_difference + date_time_internal%days_per_year
536
537	date_time_internal%year = date_time_internal%year + 1_iwp
538
539	ENDDO
540
541	ELSEIF ( date_time_internal%year > date_time_in%year ) THEN
542
543	DO WHILE ( date_time_internal%year /= date_time_in%year )
544
545	date_time_internal%year = date_time_internal%year - 1_iwp
546
547	date_time_internal = update_leapyear_setting( date_time_internal )
548	day_difference = day_difference - date_time_internal%days_per_year
549
550	ENDDO
551
552	ENDIF
553	!
554	!-- Remove full weeks of day_difference and shift day_of_week of reference by remaining days.
555	day_of_week = date_time_internal_reference_day_of_week + MOD( day_difference, days_per_week )
556
557	IF ( day_of_week > days_per_week ) THEN
558	!
559	!-- Shift index again if it is next week (above days_per_week)...
560	day_of_week = day_of_week - days_per_week
561	ELSEIF ( day_of_week <= 0_iwp ) THEN
562	!
563	!-- ...or if it is last week (below 1)
564	day_of_week = day_of_week + days_per_week
565	ENDIF
566
567	END FUNCTION get_day_of_week
568
569
570	!--------------------------------------------------------------------------------------------------!
571	! Description:
572	! ------------
573	!> Check if given year is a leap year and update days per month accordingly.
574	!--------------------------------------------------------------------------------------------------!
575	FUNCTION update_leapyear_setting( date_time_in ) RESULT( date_time_out )
576
577	TYPE(date_time_type), INTENT(IN) :: date_time_in !< input date-time
578	TYPE(date_time_type) :: date_time_out !< return date-time
579
580
581	date_time_out = date_time_in
582
583	IF ( ANY( date_time_in%year == leap_years ) ) THEN
584	date_time_out%days_per_month = days_per_month_leapyear
585	ELSE
586	date_time_out%days_per_month = days_per_month_noleapyear
587	ENDIF
588
589	date_time_out%days_per_year = SUM( date_time_out%days_per_month )
590
591	END FUNCTION update_leapyear_setting
592
593
594	!--------------------------------------------------------------------------------------------------!
595	! Description:
596	! ------------
597	!> Check if given date and time are valid. Returns 0 if all checks are passed.
598	!> @todo Revise error message. ATM, gives only last errorneous value even if multiple values violate
599	!> the bounds.
600	!--------------------------------------------------------------------------------------------------!
601	FUNCTION check_date( date_time, date_time_str ) RESULT( error_code )
602
603
604	CHARACTER(LEN=6), DIMENSION(7), PARAMETER :: error_str_list = & !< string used for error message
605	(/'year ', 'month ', 'day ', 'hour ', 'minute', 'second', 'zone '/)
606
607	CHARACTER(LEN=date_time_str_len), INTENT(IN) :: date_time_str !< date-time as string
608
609	INTEGER(iwp) :: error_code !< error code
610
611	TYPE(date_time_type), INTENT(IN) :: date_time !< date-time to be checked
612
613
614	error_code = 0
615	!
616	!-- Check date
617	IF ( date_time%month < 1_iwp .OR. date_time%month > months_per_year ) THEN
618	error_code = 2
619	ELSE
620	IF ( date_time%day < 1_iwp .OR. &
621	date_time%day > date_time%days_per_month(date_time%month) ) THEN
622	error_code = 3
623	ENDIF
624	ENDIF
625	!
626	!-- Check time
627	IF ( date_time%hour < 0_iwp .OR. date_time%hour > hours_per_day ) THEN
628	error_code = 4
629	ELSE
630	IF ( date_time%minute < 0_iwp .OR. date_time%minute > minutes_per_hour ) THEN
631	error_code = 5
632	ELSE
633	IF ( date_time%second < 0.0_wp .OR. date_time%second >= seconds_per_minute ) THEN
634	error_code = 6
635	ENDIF
636	ENDIF
637	ENDIF
638	!
639	!-- Check time zone.
640	!-- Bounds defined by maximum and minimum time zone present on earth
641	IF ( date_time%zone < -12_iwp .OR. date_time%zone > 14_iwp ) THEN
642	error_code = 7
643	ENDIF
644	!
645	!-- Raise error if any check is marked invalid
646	IF ( error_code /= 0 ) THEN
647	WRITE( message_string, * ) 'Date-time values out of bounds: "' // &
648	TRIM( error_str_list(error_code) ) // &
649	'" is out of bounds. Please check date-time string: "' // &
650	TRIM( date_time_str ) // '". ' // &
651	'Format must be "YYYY-MM-DD hh:mm:ss ZZZ".'
652	CALL message( 'check_date', 'PA0679', 2, 2, 0, 6, 0 )
653	RETURN
654	ENDIF
655
656	END FUNCTION check_date
657
658	END MODULE palm_date_time_mod

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