Every Day Counts
Zeisel Days
 
Age: 15,377 days
Date of birth
Your 7th Zeisel Day is on
Monday
when you will be
15,387 days old

A Zeisel Day occurs when your day age is a Zeisel number.

A Zeisel number, named after Helmut Zeisel, is a square-free integer k with at least three prime factors which fall into the pattern

px = apx - 1 + b

where a and b are some integer constants and x is the index number of each prime factor in the factorization, sorted from lowest to highest.

Who would not want to celebrate that?

Remind me, please


Next Main Events
Day Age
Event
Days Ahead
Year Age
23 Feb 2026
15,387
10
42
08 Mar 2026
15,400
23
42
28 Apr 2026
15,451
74
42
19 Oct 2026
15,625
248
42
19 Oct 2026
15,625
248
42
12 Mar 2027
15,769
392
43
03 Aug 2027
15,913
536
43
01 Oct 2027
15,972
595
43
29 Oct 2027
16,000
623
43
16 Nov 2028
16,384
1,007
44
05 Jul 2032
17,711
2,334
48
10 Nov 2044
22,222
6,845
60
25 May 2047
23,148
7,771
63
29 Sep 2132
54,321
38,944
148
Ordinal
Day Age
Date
Age
1st
105
22 Apr 1984
0
2nd
1,419
27 Nov 1987
3
3rd
1,729
02 Oct 1988
4
4th
1,885
07 Mar 1989
5
5th
4,505
09 May 1996
12
6th
5,719
05 Sep 1999
15
7th
15,387
23 Feb 2026
42
1
8th
24,211
22 Apr 2050
66
9th
25,085
12 Sep 2052
68
10th
27,559
22 Jun 2059
75
11th
31,929
09 Jun 2071
87
12th
54,205
05 Jun 2132
148