The total number of days between Thursday, October 12th, 2017 and Monday, August 9th, 2021 is
**1,397 days**.

This is equal to **3 years, 9 months, and 28 days**.

This does not include the end date, so it's accurate if you're measuring your age in days, or the total days between the start and end date. But if you want the duration of an event that includes both the starting date and the ending date, then it would actually be 1,398 days.

If you're counting workdays or weekends, there are **997 weekdays** and **400 weekend days**.

If you include the end date of Aug 9, 2021 which is a Monday, then there would be
**998 weekdays** and **400 weekend days** including both the starting Thursday and the ending Monday.

1,397 days is equal to **199 weeks and 4 days**.

The total time span from 2017-10-12 to 2021-08-09 is 33,528 hours.

This is equivalent to 2,011,680 minutes.

You can also convert 1,397 days to 120,700,800 seconds.

Su | M | Tu | W | Th | F | Sa |

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 |

October 12th, 2017 is a Thursday. It is the 285th day of the year, and in the 41st week of the year (assuming each week starts on a Sunday), or the 4th quarter of the year. There are 31 days in this month. 2017 is not a leap year, so there are 365 days in this year. The short form for this date used in the United States is 10/12/2017, and almost everywhere else in the world it's 12/10/2017.

Su | M | Tu | W | Th | F | Sa |

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 |

August 9th, 2021 is a Monday. It is the 221st day of the year, and in the 33rd week of the year (assuming each week starts on a Sunday), or the 3rd quarter of the year. There are 31 days in this month. 2021 is not a leap year, so there are 365 days in this year. The short form for this date used in the United States is 8/9/2021, and almost everywhere else in the world it's 9/8/2021.

This site provides an online date calculator to help you
find the difference in the number of days between any two
calendar dates. Simply enter the start and end date to
calculate the duration of any event. You can also use this
tool to determine how many days have passed since your birthday,
or measure the amount of time until your baby's due date.
The calculations use the
Gregorian calendar,
which was created in 1582 and later adopted in 1752 by
Britain and the eastern part of what is now the United States.
For best results, use dates after 1752 or verify any data
if you are doing genealogy research. Historical calendars
have many variations, including the ancient Roman calendar
and the Julian calendar.
Leap years
are used to match the calendar year with the astronomical year.
If you're trying to figure out the date that occurs in
X days from today, switch to the **Days From Now calculator**
instead.