# Calculs de calendrier
### Ajouter ou soustraire du temps à des dates
```
10 June + 3 weeks | 1 July
April 1, 2019 − 3 months 5 days | 27 December 2018
12/02/1988 + 32 years | 12 February 2020
01.05.2005 + 3 years 2 months 3 weeks | 22 July 2008
3 weeks after March 14, 2019 | 4 April 2019
28 days before March 12 | 12 February
2 months 3 days after June 5 | 8 August
yesterday - 8 weeks 3 days | 12 July
Yesterday + 1 week | 11 June
```
### Obtenir une date relative au présent
```
today + 3 weeks | 1 October
now − 1 month | 5 May
4 days from now | 14 September
3 days ago | 7 September
```
### **Trouver la durée entre deux dates**
```
January 10 - February 5 | 3 weeks 5 days
3 March to 30 May | 2 months 3 weeks 6 days
days since July 15 | 57 days
days till December 25 | 106 days
days between 3 March and 30 May | 88 days
1978 to 2021 | 42 years
```
{% hint style="info" %}
Les intervalles de temps sont calculés du midi de la première date au midi de la dernière date de l'intervalle.
Utilisez la fonction d'intervalle inclusif si vous souhaitez inclure à la fois la date de début et la date de fin dans l'intervalle (voir [ci-dessous](#inclusive-intervals-of-time-1))
{% endhint %}
### Intervalles de temps inclusifs entre deux dates
```
April 1 through April 30 in days | 30 days
```
### Numéros de semaine (ISO 8601)
```
week of year | 36
week number on march 12, 2021 | 10
```
### **Nombre de jours dans un mois ou un trimestre**
```
days in Q3 | 92 days
days in February 2020 | 29 days
```
### Trouver le point médian entre deux dates
```
midpoint between March 12 and April 5 | 24 March
halfway between today and next Thursday | 13 September
```
## Notes sur l'ambiguïté des calculs de calendrier
**Mois ambigus**
Contrairement aux jours et aux semaines, les mois ne sont pas clairement définis en termes de secondes. Soulver tente de faire ce qui est le plus logique étant donné l'expression. Il est intelligent pour prendre en compte les années bissextiles et autres particularités du calendrier :
```
Feb 28 + 1 month | 28 March
January 31 2020 + 1 month | February 29 2020
```
**Dates sans année spécifiée**
Une date sans année spécifiée peut utiliser l'année en cours ou l'année suivante.
```
# In December 2019
// next year is assumed, as the nearest January is in the future
January 12 + 3 weeks | 2 February 2020
// this year is assumed, as the month is still recently in the past
November 1 - 5 days | 27 October 2019
```
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