The Three Weeks lasts from the fast on the 17th of Tammuz (Shiva Asar B'Tammuz) and end on the end of the 9th day of Av (The fast of Tisha B'Av). However, this year Tisha B’Av falls on Shabbat, so we observe Tisha B’Av on Sunday on the 10th day of Av).
The mourning is divided into four levels of increasing severity:
From 17 Tammuz until the end of Tammuz (Evening of July 16 to Evening of July 28)
From Rosh Chodesh Av until the week that contains the 9th of Av (Evening of July 28 to evening of August 6)
The week where the 9th of Av falls. This year, the 9th of Av falls on Shabbat which means we observe Tish B’Av on the 10th of Av which is Sunday. Thus this year, there is no Week where the 9th of Av falls.
The 9th of Av itself (evening of August 6 to the night fall of August 7)
This chart shows you what is permitted and what is prohibited during that particular time period of the three weeks.
| Activity | 17 Tammuz - End of Tammuz | Rosh Chodesh until week | Week of 9th of Av | 9th of Av |
|---|---|---|---|---|
| Getting Engaged | Permitted | Permitted | Permitted | Permitted |
| Getting Married | Permitted | Prohibited | Prohibited | Prohibited |
| Saying Shehecheyanu | Prohibited except on Shabbat | Prohibited | Prohibited | Prohibited |
| Blessing Hagomel | Permitted | Permitted | Permitted | Prohibited |
| Blessing of HaTov V'HaMetiv | Permitted | Permitted | Permitted | Permitted |
| Listening to Music | Prohibited unless Depressed | Prohibited | Prohibited | Prohibited |
| Acapella Music (sans instruments) | Permitted | Prohibited (lechatehila) | Prohibited (lechatehila) | Prohibited (lechatehila) |
| Dancing | Prohibited | Prohibited | Prohibited | Prohibited |
| Taking a Shower | Permitted | Permitted | Permitted with Cold Water | Prohibited |
| Swimming / Kosher Beach | Permitted | Permitted | Prohibited | Prohibited |
| Shaving and Haircuts | Permitted | Permitted | Prohibited | Prohibited |
| Cutting Nails | Permitted | Permitted | Prohibited | Prohibited |
| Buying new shoes, clothing, and furniture | Permitted | Only if on sale or the price will increase | Prohibited | Prohibited |
| Washing Clothes | Permitted | Permitted | Prohibited | Prohibited |
| Ironing | Permitted | Permitted | Prohibited | Prohibited |
| Wearing New Clothes | Prohibited except on Shabbat | Prohibited | Prohibited | Prohibited |
| Eating Meat or Drinking Wine | Permitted | Only on Rosh Chodesh and Havdallah | Prohibited | Prohibited |