How do I count the days between two dates?

Subtract the earlier date from the later one. The calculator above does it for you and also gives the count in working days, which is usually the number people actually need.

How many months is 90 days?

90 days is just under 3 months, about 2.96. Months are not all the same length, so 90 days only lands exactly on 3 months if the span misses February.

How many weeks is 90 days?

90 days is 12.86 weeks, so 12 full weeks and 6 days over.

How many working days are in 90 days?

About 64, counting Monday to Friday and ignoring public holidays. The exact figure depends on which day the span starts on.

How many days is 6 months?

About 182 days, though it ranges from 181 to 184 depending on which months are in the span and whether February has 29 days.

Does the calculator count both the first and last day?

It counts the gap between them, so 1 January to 2 January is 1 day. If you need both days included, add one to the total.

What is the gap between dates?

It is the number of days from one to the other. To work it out by hand you subtract one date from the other, which is easy to get wrong across month and year ends.

How do I count only weekdays?

Count the full weeks and multiply by 5, then add the weekdays in the leftover days. The working days figure above already does this.

Why do leap years matter?

A leap year adds 29 February, so any span crossing it gains a day. Years divide by 4 to be leap years, except centuries, unless they divide by 400.

How many days are in a year?

365 in a normal year and 366 in a leap year. A working year is about 260 weekdays before public holidays and leave.

Calculator

Date Difference Calculator

Pick two dates and get the number of days between them, in total and counting working days only. The chart below turns common spans like 30, 90 and 180 days into weeks and months.

Start dateThe earlier dateEnd dateThe later date

0days

Total days between the two dates

Working days

Monday to Friday only

In years and months

0 days

Calendar difference

Weeks

0 full weeks

Full chart

Common spans in weeks and months

Open the band you need. Each row turns a number of days into weeks, months, and roughly how many of those days are Monday to Friday.

1 to 30 days1 to 30 days written as weeks, months and roughly how many working days.

1 to 30 days written as weeks, months and roughly how many working days.
Span	Weeks	Months	Working days
1 days	0.14	0.03	about 1
2 days	0.29	0.07	about 1
3 days	0.43	0.1	about 2
4 days	0.57	0.13	about 3
5 days	0.71	0.16	about 4
6 days	0.86	0.2	about 4
7 days	1	0.23	about 5
8 days	1.14	0.26	about 6
9 days	1.29	0.3	about 6
10 days	1.43	0.33	about 7
11 days	1.57	0.36	about 8
12 days	1.71	0.39	about 9
13 days	1.86	0.43	about 9
14 days	2	0.46	about 10
15 days	2.14	0.49	about 11
16 days	2.29	0.53	about 11
17 days	2.43	0.56	about 12
18 days	2.57	0.59	about 13
19 days	2.71	0.62	about 14
20 days	2.86	0.66	about 14
21 days	3	0.69	about 15
22 days	3.14	0.72	about 16
23 days	3.29	0.76	about 16
24 days	3.43	0.79	about 17
25 days	3.57	0.82	about 18
26 days	3.71	0.85	about 19
27 days	3.86	0.89	about 19
28 days	4	0.92	about 20
29 days	4.14	0.95	about 21
30 days	4.29	0.99	about 21

31 to 120 days31 to 120 days written as weeks, months and roughly how many working days.

31 to 120 days written as weeks, months and roughly how many working days.
Span	Weeks	Months	Working days
31 days	4.43	1.02	about 22
32 days	4.57	1.05	about 23
33 days	4.71	1.08	about 24
34 days	4.86	1.12	about 24
35 days	5	1.15	about 25
36 days	5.14	1.18	about 26
37 days	5.29	1.22	about 26
38 days	5.43	1.25	about 27
39 days	5.57	1.28	about 28
40 days	5.71	1.31	about 29
41 days	5.86	1.35	about 29
42 days	6	1.38	about 30
43 days	6.14	1.41	about 31
44 days	6.29	1.45	about 31
45 days	6.43	1.48	about 32
46 days	6.57	1.51	about 33
47 days	6.71	1.54	about 34
48 days	6.86	1.58	about 34
49 days	7	1.61	about 35
50 days	7.14	1.64	about 36
51 days	7.29	1.68	about 36
52 days	7.43	1.71	about 37
53 days	7.57	1.74	about 38
54 days	7.71	1.77	about 39
55 days	7.86	1.81	about 39
56 days	8	1.84	about 40
57 days	8.14	1.87	about 41
58 days	8.29	1.91	about 41
59 days	8.43	1.94	about 42
60 days	8.57	1.97	about 43
65 days	9.29	2.14	about 46
70 days	10	2.3	about 50
75 days	10.71	2.46	about 54
80 days	11.43	2.63	about 57
85 days	12.14	2.79	about 61
90 days	12.86	2.96	about 64
100 days	14.29	3.29	about 71
110 days	15.71	3.61	about 79
120 days	17.14	3.94	about 86

121 to 365 days121 to 365 days written as weeks, months and roughly how many working days.

121 to 365 days written as weeks, months and roughly how many working days.
Span	Weeks	Months	Working days
130 days	18.57	4.27	about 93
140 days	20	4.6	about 100
150 days	21.43	4.93	about 107
160 days	22.86	5.26	about 114
180 days	25.71	5.91	about 129
200 days	28.57	6.57	about 143
210 days	30	6.9	about 150
240 days	34.29	7.89	about 171
270 days	38.57	8.87	about 193
300 days	42.86	9.86	about 214
330 days	47.14	10.84	about 236
360 days	51.43	11.83	about 257
365 days	52.14	11.99	about 261

More than a yearMore than a year written as weeks, months and roughly how many working days.

More than a year written as weeks, months and roughly how many working days.
Span	Weeks	Months	Working days
400 days	57.14	13.14	about 286
456 days	65.14	14.98	about 326
500 days	71.43	16.43	about 357
547 days	78.14	17.97	about 391
600 days	85.71	19.71	about 429
730 days	104.29	23.98	about 521
900 days	128.57	29.57	about 643
1,000 days	142.86	32.85	about 714
1,095 days	156.43	35.98	about 782
1,460 days	208.57	47.97	about 1,043
1,825 days	260.71	59.96	about 1,304
3,650 days	521.43	119.92	about 2,607

Total days and working days are different questions

Most people asking for the days between two dates want one of two numbers, and they are far apart. From 1 March to 1 June is 92 total days and about 65 working days. Quote the wrong one on a project plan and you are a month out.

Total days is what contracts and notice periods run on: a 90-day notice period counts weekends. Working days is what delivery dates run on, because nobody is building anything on a Saturday.

The calculator gives both, and the chart converts the fixed spans people ask about into weeks and months so you do not have to reach for a calendar.

Where the count goes wrong by one

The classic error is whether to count the first day, the last day, or both. From Monday to Friday is 4 days if you count the gap and 5 if you count the days themselves. Both are defensible, which is exactly why they cause arguments.

This calculator counts the gap, so 1 January to 2 January is 1 day. If your contract counts both endpoints, add one.

Leap years are the other trap. Any span crossing 29 February gains a day. A year is a leap year if it divides by 4, except centuries, unless they divide by 400, which is why 1900 was not and 2000 was.

Days elapsed is not days worked

A project that ran from March to June took 92 days on the calendar. What it cost you is the hours people put into it, and those two numbers have almost nothing to do with each other.

That gap is the whole argument for recording as you go. Reports show the hours actually logged against a project across any span, rather than the days the calendar says it occupied.

To turn a span of hours into days, the hours to days converter has the full chart, and the hours calculator handles a single day between two times.

Answers

Frequently asked questions

Common queries and answers about the date difference calculator.

How do I count the days between two dates?: Subtract the earlier date from the later one. The calculator above does it for you and also gives the count in working days, which is usually the number people actually need.
How many months is 90 days?: 90 days is just under 3 months, about 2.96. Months are not all the same length, so 90 days only lands exactly on 3 months if the span misses February.
How many weeks is 90 days?: 90 days is 12.86 weeks, so 12 full weeks and 6 days over.
How many working days are in 90 days?: About 64, counting Monday to Friday and ignoring public holidays. The exact figure depends on which day the span starts on.
How many days is 6 months?: About 182 days, though it ranges from 181 to 184 depending on which months are in the span and whether February has 29 days.
Does the calculator count both the first and last day?: It counts the gap between them, so 1 January to 2 January is 1 day. If you need both days included, add one to the total.
What is the gap between dates?: It is the number of days from one to the other. To work it out by hand you subtract one date from the other, which is easy to get wrong across month and year ends.
How do I count only weekdays?: Count the full weeks and multiply by 5, then add the weekdays in the leftover days. The working days figure above already does this.
Why do leap years matter?: A leap year adds 29 February, so any span crossing it gains a day. Years divide by 4 to be leap years, except centuries, unless they divide by 400.
How many days are in a year?: 365 in a normal year and 366 in a leap year. A working year is about 260 weekdays before public holidays and leave.

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Date Difference Calculator

Common spans in weeks and months

Total days and working days are different questions

Where the count goes wrong by one

Days elapsed is not days worked

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