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Birthdays
Holidays optimizer
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

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..in South Korea
Today, Thursday, 11 September, 2025

Working day : yes
Week : 37 / 52
Day of the year : 254 / 365
Working day of the year : 173 / 246
Time (UTC ++9) : 00:17

Working days

EN | KO ▼
dss
Chile
Schweiz
South Africa
New Zealand
Israel
Sweden
Denmark
Norway
Finland
Turkey
Portugal
Netherlands
Belgique
Monaco
Greece
Luxembourg
Canada
Working days world map
USA
China
Japan
Australia
Russia
Ukraine
India
Deutschland
Poland
Österreich
Brasil
France
United Kingdom & Ireland
México
Colombia
Venezuela
Italia
España
Argentina
...
xxxx
From to
days:
working days:
weekend days:
custom dates:
public holidays:
Define a period
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From:
Morning
Afternoon
to:
Morning
Afternoon
Reminder
Reminder
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make it periodic
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Description
work hours
Work hours
/day
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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 
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 ()
September 2025
week
Mon
Tue
Wed
Thu
Fri
Sat
Sun
36
37
10
15
0
0
+
×
11
15
1
0
+
×
12
15
2
0
+
×
13
15
3
0
+
×
14
15
4
0
+
×
38
15
15
5
0
+
×
16
15
6
0
+
×
17
15
7
0
+
×
18
15
8
0
+
×
19
15
9
0
+
×
20
15
10
0
+
×
21
15
11
0
+
×
39
22
15
12
0
+
×
23
15
13
0
+
×
24
15
14
0
+
×
25
15
15
0
+
×
26
15
16
0
+
×
27
15
17
0
+
×
28
15
18
0
+
×
40
29
15
19
0
+
×
30
15
20
0
+
×
41
October 2025
week
Mon
Tue
Wed
Thu
Fri
Sat
Sun
40
01
15
21
0
+
×
02
15
22
0
+
×
03
15
23
0
개천절
+
×
04
15
24
0
+
×
05
15
25
0
추석
+
×
41
06
15
26
0
추석
+
×
07
15
27
0
추석
+
×
08
15
28
0
추석
+
×
09
15
29
0
한글날
+
×
10
15
30
0
+
×
11
15
31
0
+
×
12
15
32
0
+
×
42
13
15
33
0
+
×
14
15
34
0
+
×
15
15
35
0
+
×
16
15
36
0
+
×
17
15
37
0
+
×
18
15
38
0
+
×
19
15
39
0
+
×
43
20
15
40
0
+
×
21
15
41
0
+
×
22
15
42
0
+
×
23
15
43
0
+
×
24
15
44
0
+
×
25
15
45
0
+
×
26
15
46
0
+
×
44
27
15
47
0
+
×
28
15
48
0
+
×
29
15
49
0
+
×
30
15
50
0
+
×
31
15
51
0
+
×
45
November 2025
week
Mon
Tue
Wed
Thu
Fri
Sat
Sun
44
01
15
52
0
+
×
02
15
53
0
+
×
45
03
15
54
0
+
×
04
15
55
0
+
×
05
15
56
0
+
×
06
15
57
0
+
×
07
15
58
0
+
×
08
15
59
0
+
×
09
15
60
0
+
×
46
10
15
61
0
+
×
11
15
62
0
+
×
12
15
63
0
+
×
13
15
64
0
+
×
14
15
65
0
+
×
15
15
66
0
+
×
16
15
67
0
+
×
47
17
15
68
0
+
×
18
15
69
0
+
×
19
15
70
0
+
×
20
15
71
0
+
×
21
15
72
0
+
×
22
15
73
0
+
×
23
15
74
0
+
×
48
24
15
75
0
+
×
25
15
76
0
+
×
26
15
77
0
+
×
27
15
78
0
+
×
28
15
79
0
+
×
29
15
80
0
+
×
30
15
81
0
+
×
49
December 2025
week
Mon
Tue
Wed
Thu
Fri
Sat
Sun
49
01
15
82
0
+
×
02
15
83
0
+
×
03
15
84
0
+
×
04
15
85
0
+
×
05
15
86
0
+
×
06
15
87
0
+
×
07
15
88
0
+
×
50
08
15
89
0
+
×
09
15
90
0
+
×
10
15
91
0
+
×
11
15
92
0
+
×
12
15
93
0
+
×
13
15
94
0
+
×
14
15
95
0
+
×
51
15
15
96
0
+
×
16
15
97
0
+
×
17
15
98
0
+
×
18
15
99
0
+
×
19
15
100
0
+
×
20
15
101
0
+
×
21
15
102
0
+
×
52
22
15
103
0
+
×
23
15
104
0
+
×
24
15
105
0
+
×
25
15
106
0
성탄절
+
×
26
15
107
0
+
×
27
15
108
0
+
×
28
15
109
0
+
×
01
29
15
110
0
+
×
30
15
111
0
+
×
31
15
112
0
+
×
02
 
January 2026
week
Mon
Tue
Wed
Thu
Fri
Sat
Sun
01
01
15
113
0
신정
+
×
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