JavaScript Date - Exercises, Practice, Solution

Last update on May 18 2023 13:10:53 (UTC/GMT +8 hours)

JavaScript Date [57 exercises with solution]

JavaScript date object is used to create dates and times. Date objects are based on a time value that is the number of milliseconds since 1 January, 1970 UTC.

Constructor :

new Date(); 
new Date(value); 
new Date(dateString); 
new Date(year, month[, day[, hour[, minute[, second[, millisecond]]]]]);

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1. Write a JavaScript function to check whether an `input` is a date object or not.

Test Data :
console.log(is_date("October 13, 2014 11:13:00"));
console.log(is_date(new Date(86400000)));
console.log(is_date(new Date(99,5,24,11,33,30,0)));
console.log(is_date([1, 2, 4, 0]));
Output :
false
true
true
false

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2. Write a JavaScript function to get the current date.

Note : Pass a separator as an argument.
Test Data :
console.log(curday('/'));
console.log(curday('-'));
Output :
"11/13/2014"
"11-13-2014"

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3. Write a JavaScript function to get the number of days in a month.

Test Data :
console.log(getDaysInMonth(1, 2012));
console.log(getDaysInMonth(2, 2012));
console.log(getDaysInMonth(9, 2012));
console.log(getDaysInMonth(12, 2012));
Output :
31
29
30
31

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4. Write a JavaScript function to get the month name from a particular date.

Test Data :
console.log(month_name(new Date("10/11/2009")));
console.log(month_name(new Date("11/13/2014")));
Output :
"October"
"November"

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5. Write a JavaScript function to compare dates (i.e. greater than, less than or equal to).

Test Data :
console.log(compare_dates(new Date('11/14/2013 00:00'), new Date('11/14/2013 00:00')));
console.log(compare_dates(new Date('11/14/2013 00:01'), new Date('11/14/2013 00:00')));
console.log(compare_dates(new Date('11/14/2013 00:00'), new Date('11/14/2013 00:01')));
Output :
"Date1 = Date2"
"Date1 > Date2"
"Date2 > Date1"

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6. Write a JavaScript function to add specified minutes to a Date object.

Test Data :
console.log(add_minutes(new Date(2014,10,2), 30).toString());
Output :
"Sun Nov 02 2014 00:30:00 GMT+0530 (India Standard Time)"

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7. Write a JavaScript function to test whether a date is a weekend.

Note : Use standard Saturday/Sunday definition of a weekend.
Test Data :
console.log(is_weekend('Nov 15, 2014'));
console.log(is_weekend('Nov 16, 2014'));
console.log(is_weekend('Nov 17, 2014'));
Output :
"weekend"
"weekend"
undefined

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8. Write a JavaScript function to get the difference between two dates in days.

Test Data :
console.log(date_diff_indays('04/02/2014', '11/04/2014'));
console.log(date_diff_indays('12/02/2014', '11/04/2014'));
Output :
216
-28

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9. Write a JavaScript function to get the last day of a month.

Test Data :
console.log(lastday(2014,0));
console.log(lastday(2014,1));
console.log(lastday(2014,11));
Output :
31
28
31

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10. Write a JavaScript function to calculate 'yesterday's day.

Test Data :
console.log(yesterday('Nov 15, 2014'));
console.log(yesterday('Nov 16, 2015'));
console.log(yesterday('Nov 17, 2016'));
Output :
"Fri Nov 14 2014 00:00:00 GMT+0530 (India Standard Time)"
"Sun Nov 15 2015 00:00:00 GMT+0530 (India Standard Time)"
"Wed Nov 16 2016 00:00:00 GMT+0530 (India Standard Time)"

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11. Write a JavaScript function to get the maximum date from an array of dates.

Test Data :
console.log(max_date(['2015/02/01', '2015/02/02', '2015/01/03']));
Output :
"2015/02/02"

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12. Write a JavaScript function to get the minimum date from an array of dates.

Test Data :
console.log(min_date(['2015/02/01', '2015/02/02', '2015/01/03']));
Output :
"2015/01/03"

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13. Write a JavaScript function that returns the number of minutes in hours and minutes.

Test Data :
console.log(timeConvert(200));
Output :
"200 minutes = 3 hour(s) and 20 minute(s)."

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14. Write a JavaScript function to get the number of days in a year.

Test Data :
console.log(days_of_a_year(2015));
365
console.log(days_of_a_year(2016));
366

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15. Write a JavaScript function to get the quarter (1 to 4) of the year.

Test Data :
console.log(quarter_of_the_year(new Date(2015, 1, 21)));
2
console.log(quarter_of_the_year(new Date(2015, 10, 18)));
4

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16. Write a JavaScript function to count the number of days passed since the year began.

Test Data :
console.log(days_passed(new Date(2015, 0, 15)));
15
console.log(days_passed(new Date(2015, 11, 14)));
348

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17. Write a JavaScript function to convert a Unix timestamp to time.

Test Data :
console.log(days_passed(new Date(2015, 0, 15)));
15
console.log(days_passed(new Date(2015, 11, 14)));
348

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18. Write a JavaScript program to calculate age.

Test Data :
console.log(calculate_age(new Date(1982, 11, 4)));
32
console.log(calculate_age(new Date(1962, 1, 1)));
53

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19. Write a JavaScript function to get the day of the month, 2 digits with leading zeros.
Test Data :
d= new Date(2015, 10, 1);
console.log(day_of_the_month(d));
"01"

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20. Write a JavaScript function to get a textual representation of a day (three letters, Mon through Sun).
Test Data :
dt = new Date(2015, 10, 1);
console.log(short_Days(dt));
"Sun"

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21. Write a JavaScript function to get a full textual representation of the weekday (Sunday through Saturday).
Test Data :
dt = new Date(2015, 10, 1);
console.log(long_Days(dt));
"Sunday"

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22. Write a JavaScript function to get an ISO-8601 numeric representation of the day of the week (1 (for Monday) to 7 (for Sunday).
Test Data :
dt = new Date(2015, 10, 1);
console.log(ISO_numeric_date(dt));
7

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23. Write a JavaScript function to get the English ordinal suffix for the day of the month, 2 characters (st, nd, rd, or th).
Test Data :
dt = new Date(2015, 10, 1);
console.log(english_ordinal_suffix(dt));
"1st"

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24. Write a JavaScript function for obtaining ISO-8601 week numbers for weeks that begin on Monday.
Example : 42 (the 42nd week in the year)
Test Data :
dt = new Date(2015, 10, 1);
console.log(ISO8601_week_no(dt));
44

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25. Write a JavaScript function to get a full text representation of a month, such as January or June.
Test Data :
dt = new Date(2015, 10, 1);
console.log(full_month(dt));
"November"

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26. Write a JavaScript function to get a numeric representation of a month, with leading zeros (01 through 12).
Test Data :
dt = new Date(2015, 10, 1);
console.log(numeric_month(dt));
"11"

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27. Write a JavaScript function to get a short textual representation of a month, three letters (Jan through Dec).
Test Data :
dt = new Date(2015, 10, 1);
console.log(short_months(dt));
"Nov"

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28. Write a JavaScript function to get a full numeric representation of a year (4 digits).
Test Data :
dt = new Date(2015, 10, 1);
console.log(full_year(dt));
2015

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29. Write a JavaScript function to get a two-digit year representation.
Examples : 79 or 04
Test Data :
dt = new Date(1989, 10, 1);
console.log(sort_year(dt));
"89"

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30. Write a JavaScript function to get lowercase Ante meridiem and Post meridiem.
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31. Write a JavaScript function to get uppercase Ante meridiem and Post meridiem.

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32. Write a JavaScript function to swatch Internet time (000 through 999).
Test Data :
dt = new Date(1989, 10, 1);
console.log(internet_time(dt));
812

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33. Write a JavaScript function to get the 12-hour format of an hour with leading zeros.
Test Data :
dt = new Date(1989, 10, 1);
console.log(hours_with_zeroes(dt));
"12"

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34. Write a JavaScript function to get the 24-hour format of an hour without leading zeros.
Test Data :
dt = new Date(1989, 10, 1);
console.log(hours_without_zeroes(dt));
0

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35. Write a JavaScript function to get minutes with leading zeros (00 to 59).
Test Data :
dt = new Date(1989, 10, 1);
console.log(minutes_with_leading_zeros(dt));
"00"

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36. Write a JavaScript function to get seconds with leading zeros (00 through 59).
Test Data :
dt = new Date(1989, 10, 1);
console.log(seconds_with_leading_zeros(dt));
"00"

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37. Write a JavaScript function to get the Timezone.
Test Data :
dt = new Date();
console.log(seconds_with_leading_zeros(dt));
"India Standard Time"
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38. Write a JavaScript function to find out whether or not the date is daylight savings time.
Test Data :
dt = new Date();
console.log(daylights_savings(dt));
1

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39. Write a JavaScript function to get the difference between Greenwich time (GMT) and in hours.
Test Data :
dt = new Date();
console.log(diff_to_GMT(dt));
"+05.500"

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40. Write a JavaScript function to get the timezone offset in seconds.
Note : The offset for timezones west of UTC is always negative, and for those east of UTC is always positive.
Test Data :
dt = new Date();
console.log(timezone_offset_in_seconds(dt));
19800

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41. Write a JavaScript function to add specified years to a date.
Test Data :
dt = new Date(2014,10,2);
console.log(add_years(dt, 10).toString());
Output :
"Sat Nov 02 2024 00:00:00 GMT+0530 (India Standard Time)"

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42. Write a JavaScript function to add specified weeks to a date.
Test Data :
dt = new Date(2014,10,2);
console.log(add_weeks(dt, 10).toString());
Output :
"Sun Jan 11 2015 00:00:00 GMT+0530 (India Standard Time)"

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43. Write a JavaScript function to add specified months to a date.
Test Data :
dt = new Date(2014,10,2);
console.log(add_months(dt, 10).toString());
Output :
"Wed Sep 02 2015 00:00:00 GMT+0530 (India Standard Time)"

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44. Write a JavaScript function to get time differences in minutes between two dates.
Test Data :
dt1 = new Date("October 13, 2014 11:11:00");
dt2 = new Date("October 13, 2014 11:13:00");
console.log(diff_minutes(dt1, dt2));
2

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45. Write a JavaScript function to get time differences in hours between two dates.
Test Data :
dt1 = new Date("October 13, 2014 08:11:00");
dt2 = new Date("October 13, 2014 11:13:00");
console.log(diff_hours(dt1, dt2));
3

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46. Write a JavaScript function to get time differences in days between two dates.
Test Data :
dt1 = new Date("October 13, 2014 08:11:00");
dt2 = new Date("October 19, 2014 11:13:00");
console.log(diff_days(dt1, dt2));
6

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47. Write a JavaScript function to get time differences in weeks between two dates.
Test Data :
dt1 = new Date("June 13, 2014 08:11:00");
dt2 = new Date("October 19, 2014 11:13:00");
console.log(diff_weeks(dt1, dt2));
18

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48. Write a JavaScript function to get time differences in months between two dates.
Test Data :
dt1 = new Date("June 13, 2014 08:11:00");
dt2 = new Date("October 19, 2014 11:13:00");
console.log(diff_months(dt1, dt2));
5

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49. Write a JavaScript function to get time differences in years between two dates.
Test Data :
dt1 = new Date("June 13, 2014 08:11:00");
dt2 = new Date("October 19, 2017 11:13:00");
console.log(diff_years(dt1, dt2));
3

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50. Write a JavaScript function to get the week's start date.
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51. Write a JavaScript function to get the week end date.
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52. Write a JavaScript function to get the month's start date.
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53. Write a JavaScript function to get the month end date.
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54. Write a JavaScript function to check if a given date is between two other dates.
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55. Write a JavaScript program to check if the current date is a weekday or a weekend.
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56. Write a JavaScript program that accepts a month in the format mm/yyyy and display the month's calendar.

Test Data: ('1/2019') ->

"M   T   W   Th  F   S   Su"
"    1   2   3   4   5   6   "
"7   8   9   10  11  12  13  "
"14  15  16  17  18  19  20  "
"21  22  23  24  25  26  27  "
"28  29  30  31  "

('2/1990') ->

"M   T   W   Th  F   S   Su"
"        1   2   3   4   5   "
"6   7   8   9   10  11  12  "
"13  14  15  16  17  18  19  "
"20  21  22  23  24  25  26  "
"27  28  "

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57. Write a JavaScript program to get the name of a day based on a given date in string format.

Test Data:
("07/11/2000") -> "Tuesday"
("11/06/2017") -> "Sunday"
("11/26/2017") -> "Not a valid Date!"
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JavaScript: Tips of the Day

Spread operator

const user = { name: 'Owen', age: 21 };
const admin = { admin: true, ...user };

console.log(admin);

It's possible to combine objects using the spread operator .... It lets you create copies of the key/value pairs of one object, and add them to another object. In this case, we create copies of the user object, and add them to the admin object. The admin object now contains the copied key/value pairs, which results in { admin: true, name: "Owen", age: 21 }.

Ref: https://bit.ly/323Y0P6

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