Define a period
AI Assistant
Assistant: Hello! I handle your requests in natural language, such as:

“Analyze the period from November 1, 2025, to April 25, 2028.”
or
“Add 100 business days to February 25, 2026.”
or
“Next Thursday at 2:12 PM + 124 working hours”
or
“I won't be working first week of next may (going to Greece)”
Assistant: I understand all languages.
Send
Make
every
day
count
..in Netherlands
| National holidays

Working days

EN | NL ▼
Employee  ▼
Japan
México
Colombia
Venezuela
Argentina
Chile
Australia
South Africa
New Zealand
Israel
Turkey
Portugal
Monaco
Greece
Luxembourg
Working days world map
Deutschland
Poland
Österreich
Belgique
Schweiz
Sweden
Denmark
Finland
USA
France
United Kingdom & Ireland
Norway
Russia
Ukraine
Brasil
India
China
South Korea
Canada
...
xxxx
From to
days:
working days:
weekend days:
custom dates:
public holidays:
Define a period
×
From:
to:
Morning
Afternoon
Reminder
Reminder
▼
make it periodic
Make it periodic
Description
work hours
Work hours
/day
▼
Teleworking
wages
Wages
€
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Contact
The Holidays        ptimizer
It tells you when to take your days off to maximize the length of your vacation
I would like to take
days off
from  
 to 
days
Before running the optimizer, clicking on the days of the calendar you can define:
the days you must necessarily be at work ()
the days you want to be on holidays for sure ()
January 2000
week
Mon
Tue
Wed
Thu
Fri
Sat
Sun
52
01
15
0
0
Nieuwjaar
+
×
02
15
1
0
+
×
01
03
15
2
0
+
×
04
15
3
0
+
×
05
15
4
0
+
×
06
15
5
0
+
×
07
15
6
0
+
×
08
15
7
0
+
×
09
15
8
0
+
×
02
10
15
9
0
+
×
11
15
10
0
+
×
12
15
11
0
+
×
13
15
12
0
+
×
14
15
13
0
+
×
15
15
14
0
+
×
16
15
15
0
+
×
03
17
15
16
0
+
×
18
15
17
0
+
×
19
15
18
0
+
×
20
15
19
0
+
×
21
15
20
0
+
×
22
15
21
0
+
×
23
15
22
0
+
×
04
24
15
23
0
+
×
25
15
24
0
+
×
26
15
25
0
+
×
27
15
26
0
+
×
28
15
27
0
+
×
29
15
28
0
+
×
30
15
29
0
+
×
05
31
15
30
0
+
×
February 2000
week
Mon
Tue
Wed
Thu
Fri
Sat
Sun
05
01
15
31
0
+
×
02
15
32
0
+
×
03
15
33
0
+
×
04
15
34
0
+
×
05
15
35
0
+
×
06
15
36
0
+
×
06
07
15
37
0
+
×
08
15
38
0
+
×
09
15
39
0
+
×
10
15
40
0
+
×
11
15
41
0
+
×
12
15
42
0
+
×
13
15
43
0
+
×
07
14
15
44
0
+
×
15
15
45
0
+
×
16
15
46
0
+
×
17
15
47
0
+
×
18
15
48
0
+
×
19
15
49
0
+
×
20
15
50
0
+
×
08
21
15
51
0
+
×
22
15
52
0
+
×
23
15
53
0
+
×
24
15
54
0
+
×
25
15
55
0
+
×
26
15
56
0
+
×
27
15
57
0
+
×
09
28
15
58
0
+
×
29
15
59
0
+
×
10
March 2000
week
Mon
Tue
Wed
Thu
Fri
Sat
Sun
09
01
15
60
0
+
×
02
15
61
0
+
×
03
15
62
0
+
×
04
15
63
0
+
×
05
15
64
0
+
×
10
06
15
65
0
+
×
07
15
66
0
+
×
08
15
67
0
+
×
09
15
68
0
+
×
10
15
69
0
+
×
11
15
70
0
+
×
12
15
71
0
+
×
11
13
15
72
0
+
×
14
15
73
0
+
×
15
15
74
0
+
×
16
15
75
0
+
×
17
15
76
0
+
×
18
15
77
0
+
×
19
15
78
0
+
×
12
20
15
79
0
+
×
21
15
80
0
+
×
22
15
81
0
+
×
23
15
82
0
+
×
24
15
83
0
+
×
25
15
84
0
+
×
26
15
85
0
+
×
13
27
15
86
0
+
×
28
15
87
0
+
×
29
15
88
0
+
×
30
15
89
0
+
×
31
15
90
0
+
×
14
April 2000
week
Mon
Tue
Wed
Thu
Fri
Sat
Sun
13
01
15
91
0
+
×
02
15
92
0
+
×
14
03
15
93
0
+
×
04
15
94
0
+
×
05
15
95
0
+
×
06
15
96
0
+
×
07
15
97
0
+
×
08
15
98
0
+
×
09
15
99
0
+
×
15
10
15
100
0
+
×
11
15
101
0
+
×
12
15
102
0
+
×
13
15
103
0
+
×
14
15
104
0
+
×
15
15
105
0
+
×
16
15
106
0
+
×
16
17
15
107
0
+
×
18
15
108
0
+
×
19
15
109
0
+
×
20
15
110
0
+
×
21
15
111
0
Goede Vrijdag
+
×
22
15
112
0
+
×
23
15
113
0
Eerste Paasdag
+
×
17
24
15
114
0
Tweede Paasdag
+
×
25
15
115
0
+
×
26
15
116
0
+
×
27
15
117
0
+
×
28
15
118
0
+
×
29
15
119
0
Koninginnedag
+
×
30
15
120
0
+
×
18
 
May 2000
week
Mon
Tue
Wed
Thu
Fri
Sat
Sun
18
01
15
121
0
+
×
02
15
122
0
+
×
03
15
123
0
+
×
04
15
124
0
+
×
05
15
125
0
Bevrijdingsdag
+
×
06
15
126
0
+
×
07
15
127
0
+
×
19
08
15
128
0
+
×
09
15
129
0
+
×
10
15
130
0
+
×
11
15
131
0
+
×
12
15
132
0
+
×
13
15
133
0
+
×
14
15
134
0
+
×
20
15
15
135
0
+
×
16
15
136
0
+
×
17
15
137
0
+
×
18
15
138
0
+
×
19
15
139
0
+
×
20
15
140
0
+
×
21
15
141
0
+
×
21
22
15
142
0
+
×
23
15
143
0
+
×
24
15
144
0
+
×
25
15
145
0
+
×
26
15
146
0
+
×
27
15
147
0
+
×
28
15
148
0
+
×
22
29
15
149
0
+
×
30
15
150
0
+
×
31
15
151
0
+
×
23
June 2000
week
Mon
Tue
Wed
Thu
Fri
Sat
Sun
22
01
15
152
0
Hemelvaartsdag
+
×
02
15
153
0
+
×
03
15
154
0
+
×
04
15
155
0
+
×
23
05
15
156
0
+
×
06
15
157
0
+
×
07
15
158
0
+
×
08
15
159
0
+
×
09
15
160
0
+
×
10
15
161
0
+
×
11
15
162
0
Eerste Pinksterdag
+
×
24
12
15
163
0
Tweede Pinksterdag
+
×
13
15
164
0
+
×
14
15
165
0
+
×
15
15
166
0
+
×
16
15
167
0
+
×
17
15
168
0
+
×
18
15
169
0
+
×
25
19
15
170
0
+
×
20
15
171
0
+
×
21
15
172
0
+
×
22
15
173
0
+
×
23
15
174
0
+
×
24
15
175
0
+
×
25
15
176
0
+
×
26
26
15
177
0
+
×
27
15
178
0
+
×
28
15
179
0
+
×
29
15
180
0
+
×
30
15
181
0
+
×
27
July 2000
week
Mon
Tue
Wed
Thu
Fri
Sat
Sun
26
01
15
182
0
+
×
02
15
183
0
+
×
27
03
15
184
0
+
×
04
15
185
0
+
×
05
15
186
0
+
×
06
15
187
0
+
×
07
15
188
0
+
×
08
15
189
0
+
×
09
15
190
0
+
×
28
10
15
191
0
+
×
11
15
192
0
+
×
12
15
193
0
+
×
13
15
194
0
+
×
14
15
195
0
+
×
15
15
196
0
+
×
16
15
197
0
+
×
29
17
15
198
0
+
×
18
15
199
0
+
×
19
15
200
0
+
×
20
15
201
0
+
×
21
15
202
0
+
×
22
15
203
0
+
×
23
15
204
0
+
×
30
24
15
205
0
+
×
25
15
206
0
+
×
26
15
207
0
+
×
27
15
208
0
+
×
28
15
209
0
+
×
29
15
210
0
+
×
30
15
211
0
+
×
31
31
15
212
0
+
×
August 2000
week
Mon
Tue
Wed
Thu
Fri
Sat
Sun
31
01
15
213
0
+
×
02
15
214
0
+
×
03
15
215
0
+
×
04
15
216
0
+
×
05
15
217
0
+
×
06
15
218
0
+
×
32
07
15
219
0
+
×
08
15
220
0
+
×
09
15
221
0
+
×
10
15
222
0
+
×
11
15
223
0
+
×
12
15
224
0
+
×
13
15
225
0
+
×
33
14
15
226
0
+
×
15
15
227
0
+
×
16
15
228
0
+
×
17
15
229
0
+
×
18
15
230
0
+
×
19
15
231
0
+
×
20
15
232
0
+
×
34
21
15
233
0
+
×
22
15
234
0
+
×
23
15
235
0
+
×
24
15
236
0
+
×
25
15
237
0
+
×
26
15
238
0
+
×
27
15
239
0
+
×
35
28
15
240
0
+
×
29
15
241
0
+
×
30
15
242
0
+
×
31
15
243
0
+
×
36
 
September 2000
week
Mon
Tue
Wed
Thu
Fri
Sat
Sun
35
01
15
244
0
+
×
02
15
245
0
+
×
03
15
246
0
+
×
36
04
15
247
0
+
×
05
15
248
0
+
×
06
15
249
0
+
×
07
15
250
0
+
×
08
15
251
0
+
×
09
15
252
0
+
×
10
15
253
0
+
×
37
11
15
254
0
+
×
12
15
255
0
+
×
13
15
256
0
+
×
14
15
257
0
+
×
15
15
258
0
+
×
16
15
259
0
+
×
17
15
260
0
+
×
38
18
15
261
0
+
×
19
15
262
0
+
×
20
15
263
0
+
×
21
15
264
0
+
×
22
15
265
0
+
×
23
15
266
0
+
×
24
15
267
0
+
×
39
25
15
268
0
+
×
26
15
269
0
+
×
27
15
270
0
+
×
28
15
271
0
+
×
29
15
272
0
+
×
30
15
273
0
+
×
40
October 2000
week
Mon
Tue
Wed
Thu
Fri
Sat
Sun
39
01
15
274
0
+
×
40
02
15
275
0
+
×
03
15
276
0
+
×
04
15
277
0
+
×
05
15
278
0
+
×
06
15
279
0
+
×
07
15
280
0
+
×
08
15
281
0
+
×
41
09
15
282
0
+
×
10
15
283
0
+
×
11
15
284
0
+
×
12
15
285
0
+
×
13
15
286
0
+
×
14
15
287
0
+
×
15
15
288
0
+
×
42
16
15
289
0
+
×
17
15
290
0
+
×
18
15
291
0
+
×
19
15
292
0
+
×
20
15
293
0
+
×
21
15
294
0
+
×
22
15
295
0
+
×
43
23
15
296
0
+
×
24
15
297
0
+
×
25
15
298
0
+
×
26
15
299
0
+
×
27
15
300
0
+
×
28
15
301
0
+
×
29
15
302
0
+
×
44
30
15
303
0
+
×
31
15
304
0
+
×
November 2000
week
Mon
Tue
Wed
Thu
Fri
Sat
Sun
44
01
15
305
0
+
×
02
15
306
0
+
×
03
15
307
0
+
×
04
15
308
0
+
×
05
15
309
0
+
×
45
06
15
310
0
+
×
07
15
311
0
+
×
08
15
312
0
+
×
09
15
313
0
+
×
10
15
314
0
+
×
11
15
315
0
+
×
12
15
316
0
+
×
46
13
15
317
0
+
×
14
15
318
0
+
×
15
15
319
0
+
×
16
15
320
0
+
×
17
15
321
0
+
×
18
15
322
0
+
×
19
15
323
0
+
×
47
20
15
324
0
+
×
21
15
325
0
+
×
22
15
326
0
+
×
23
15
327
0
+
×
24
15
328
0
+
×
25
15
329
0
+
×
26
15
330
0
+
×
48
27
15
331
0
+
×
28
15
332
0
+
×
29
15
333
0
+
×
30
15
334
0
+
×
49
December 2000
week
Mon
Tue
Wed
Thu
Fri
Sat
Sun
48
01
15
335
0
+
×
02
15
336
0
+
×
03
15
337
0
+
×
49
04
15
338
0
+
×
05
15
339
0
+
×
06
15
340
0
+
×
07
15
341
0
+
×
08
15
342
0
+
×
09
15
343
0
+
×
10
15
344
0
+
×
50
11
15
345
0
+
×
12
15
346
0
+
×
13
15
347
0
+
×
14
15
348
0
+
×
15
15
349
0
+
×
16
15
350
0
+
×
17
15
351
0
+
×
51
18
15
352
0
+
×
19
15
353
0
+
×
20
15
354
0
+
×
21
15
355
0
+
×
22
15
356
0
+
×
23
15
357
0
+
×
24
15
358
0
+
×
52
25
15
359
0
Eerste Kerstdag
+
×
26
15
360
0
Tweede Kerstdag
+
×
27
15
361
0
+
×
28
15
362
0
+
×
29
15
363
0
+
×
30
15
364
0
+
×
31
15
365
0
+
×
01
 
January 2001
week
Mon
Tue
Wed
Thu
Fri
Sat
Sun
01
01
15
366
0
Nieuwjaar
+
×
02
03
04
05
06
Public holidays
Weekend days
Days to take
Vacations
Days to take:
You can now adjust the optimization by clicking on the calendar
Holidays length:
Optimization factor:
?
Copy
×
From to
:
I have to be at work
I know I want to be on vacation
?
I let the optimizer decide