Formatos de data e funções extratoras
R Intermediário para Finanças
Lore Dirick
Manager of Data Science Curriculum at Flatiron School
Formatos de data
# Padrão ISO 8601: ano-mês-dia
as.Date("2017-01-28")
"2017-01-28"
# Forma alternativa: ano/mês/dia
as.Date("2017/01/28")
"2017-01-28"
# Falha: mês/dia/ano
as.Date("01/28/2017")
Error in charToDate(x) :
character string is not in
a standard unambiguous format
# Informe explicitamente o formato ao R
as.Date("01/28/2017", format = "%m/%d/%Y")
"2017-01-28"
Formatos de data
| Format | Description |
|---|---|
| %d | Day of the month (01-31) |
| %m | Month (01-12) |
| %y | Year without century (00-99) |
| %Y | Year with century (0-9999) |
| %b | Abbreviated month name |
| %B | Full month name |
| / - , | Common separators |
Formatos de data
| Format | Description |
|---|---|
| %d | Day of the month (01-31) |
| %m | Month (01-12) |
| %y | Year without century (00-99) |
| %Y | Year with century (0-9999) |
| %b | Abbreviated month name |
| %B | Full month name |
| / - , | Common separators |
Formatos de data
| Format | Description |
|---|---|
| %d | Day of the month (01-31) |
| %m | Month (01-12) |
| %y | Year without century (00-99) |
| %Y | Year with century (0-9999) |
| %b | Abbreviated month name |
| %B | Full month name |
| / - , | Common separators |
Formatos de data
| Format | Description |
|---|---|
| %d | Day of the month (01-31) |
| %m | Month (01-12) |
| %y | Year without century (00-99) |
| %Y | Year with century (0-9999) |
| %b | Abbreviated month name |
| %B | Full month name |
| / - , | Common separators |
Formatos de data
| Format | Description |
|---|---|
| %d | Day of the month (01-31) |
| %m | Month (01-12) |
| %y | Year without century (00-99) |
| %Y | Year with century (0-9999) |
| %b | Abbreviated month name |
| %B | Full month name |
| / - , | Common separators |
Exemplo de formato de data
| Format | Description |
|---|---|
| %d | Day of the month (01-31) |
| %Y | Year with century (0-9999) |
| %B | Full month name |
| / - , | Common separators |
# Falência do Lehman Brothers
# Formato complexo - o que usar?
as.Date("September 15, 2008", format = "___")
as.Date("September 15, 2008", format = "%B %d, %Y")
"2008-09-15"
Funções extratoras
dates <- as.Date(c("2017-01-03", "2017-01-04"))
weekdays(dates)
"Tuesday" "Wednesday"
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