R语言 获得给定日期和时间对象的字符串表示 – strftime() 函数
R语言中的 strftime() 函数用于将给定的日期和时间对象转换为其字符串表示。
语法: strftime(time)
参数:
time: 指定的时间对象
例子1:
# R program to illustrate
# strftime function
# Specifying a date and time
x <- "2020-06-01 16:15:10 EST"
# Calling strftime() function
strftime(x)
输出:
[1] "2020-06-01 16:15:10"
例2:
# R program to illustrate
# strftime function
# Specifying a date and time using
# as.Date( ) function which converts
# the character data to dates.
x <- as.Date("2020-06-17 12:10:20 EST")
# Calling the strftime() function using the % F format
# which is equivalent to % Y-% m-% d (the ISO 8601 date format)
y <- strftime(x, '% F')
# Getting string representation of
# the given date and time object
y
输出:
[1] "2020-06-17"