A half anniversary is the date six months after an anniversary, such as your wedding anniversary or the day you started dating. For a relationship that began on 14 February, the half anniversary is 14 August. Many couples celebrate their first half anniversary, six months together, as an early milestone.
Half anniversary calculator
The calculator runs in your browser and does not store the date you enter.
How to work out a half anniversary
Use the same rule as a half birthday:
- Add six months to the anniversary month.
- Keep the same day of the month.
- If that day does not exist, use the last day of the month. An anniversary on 31 August has its half anniversary on 28 February, or 29 February in a leap year.
| Anniversary | Half anniversary |
|---|---|
| 1 January | 1 July |
| 14 February | 14 August |
| 31 March | 30 September |
| 15 June | 15 December |
| 31 August | 28 February (29 in a leap year) |
| 24 December | 24 June |
For any date, the 6 months from today calculator also works.
Is a half anniversary a real thing?
It is not a traditional milestone like a 10th or 25th wedding anniversary, but it has become popular, especially among new couples. Six months together often feels like a meaningful point in a relationship: long enough to have shared memories, early enough that every milestone still feels new.
How many days is six months together?
Between 181 and 184 days, depending on the months. That is about 26 weeks.
Half anniversary ideas
- Recreate your first date at the same place, or as close as you can get at home.
- Six-month memory jar: write six memories, one from each month together.
- Half-and-half dinner: each of you cooks or chooses half the meal.
- Photo timeline of your first six months.
- Half-day trip to somewhere neither of you has been.
- Write letters to open on your full anniversary.
- Plan something for the next six months, such as a trip or a concert.
- Watch the first film you saw together.
- Share half a dessert, or a cake cut in half with “½” on it.
- Make a playlist of songs from your first six months.
Half anniversary gifts
- A small framed photo from your first six months.
- A six-month subscription to something you can enjoy together.
- A “half” themed card: cut a card in half and write your message on one half.
- Tickets for something in the next six months.
- A handwritten letter. Often the gift people remember most.
Gifts do not need to be expensive; a half anniversary is a light, fun occasion. More ideas in our half birthday gift ideas, many of which work for couples too.
Half anniversary messages
- Happy half anniversary! Six months with you went by in a flash.
- Halfway to our first year, and I’d do every day again.
- Six months together, and I’m still excited every time I see you.
- Happy half anniversary to my favourite person.
- Here’s to the next six months, and many more after that.
- Half a year of us. The best half year yet.
Half anniversaries for married couples
Married couples can celebrate a half anniversary every year: six months after the wedding date. Some couples use it as a mid-year check-in, a casual date night, or an excuse to celebrate in a quieter month. If your wedding was in a busy month, such as December, the half anniversary in June can be the more relaxed celebration.
Half anniversary questions
What is a half anniversary?
The date six months after an anniversary, or six months after a couple got together.
How do you calculate a half anniversary?
Add six months to the anniversary date and keep the same day. If that day does not exist in the new month, use the last day of the month.
Do couples celebrate half anniversaries?
Many do, especially the first one at six months together. It is usually a small celebration, such as a dinner or a thoughtful message.
What do you give for a half anniversary?
Something small and personal: a photo, a letter, a memory jar or tickets for something you will do together.
What is a 1½-year anniversary?
It is 18 months after the start date. See how many months is a year and a half.
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Last updated: 5 November 2026.