R语言日期时间类date-time()函数-中英文对照帮助文档

MicroRBT

        R语言日期时间类date-time()函数-中英文对照帮助文档

                                         By MicroRbt Martinez PhD

R语言函数名：date-time()
R语言函数功能：日期时间类
来自资源库：基础库（R语言自带）
date-time()函数所属R语言包：所在R包具体名称、包功能的中英文双语描述见正文后面'--所在R语言包信息--'部分。

描述-----Description-----

Description of the classes "POSIXlt" and "POSIXct" representing calendar dates and times.
代表日历日期和时间的类"POSIXlt"和"POSIXct"的描述。


使用方法-----Usage-----

## S3 method for class 'POSIXct' S3 method for class 'POSIXct'
print(x, tz = "", usetz = TRUE, max = NULL, ...)
## S3 method for class 'POSIXct' S3 method for class 'POSIXct'
summary(object, digits = 15, ...)
time + z
z + time
time - z
time1 lop time2

参数-----Arguments-----

参数x, object介绍: an object to be printed or summarized from one of the date-time classes.
从日期时间类之一中打印或汇总的对象。

参数tz, usetz介绍: for timezone formatting, passed to format.POSIXct.
用于时区格式，传递给format.POSIXct。

参数max介绍: numeric or NULL, specifying the maximal number of entries to be printed. By default, when NULL, getOption("max.print") used.
数字或NULL，指定要打印的最大条目数。默认情况下，使用NULL，getOption("max.print")时。

参数digits介绍: number of significant digits for the computations: should be high enough to represent the least important time unit exactly.
计算的有效位数：应该足够高以准确表示最不重要的时间单位。

参数...介绍: further arguments to be passed from or to other methods.
要从其他方法传递或传递给其他方法的其他参数。

参数time介绍: date-time objects
日期时间对象

参数time1, time2介绍: date-time objects or character vectors. (Character vectors are converted by as.POSIXct.)
日期时间对象或字符向量。 （字符向量由as.POSIXct转换。）

参数z介绍: a numeric vector (in seconds)
数值向量（以秒为单位）

参数lop介绍: one of ==, !=, <, <=, > or >=.
==，!=，<，<=，>或>=之一。


详情-----Details-----

There are two basic classes of date/times. Class "POSIXct" represents the (signed) number of seconds since the beginning of 1970 (in the UTC time zone) as a numeric vector. Class "POSIXlt" is a named list of vectors representing
日期/时间有两个基本类别。类"POSIXct"用数字向量表示自1970年初（在UTC时区）以来的秒数（带符号）。类"POSIXlt"是向量的命名列表，表示

0—61: seconds.
0±61：秒。

0—59: minutes.
0±59：分钟。

0—23: hours.
0至23：小时。

1—31: day of the month
1月31日：每月的某天

0—11: months after the first of the year.
0×11：从第一年开始的几个月。

years since 1900.
自1900年以来。

0—6 day of the week, starting on Sunday.
每周的0×6天，从星期日开始。

0—365: day of the year (365 only in leap years).
0?a365：一年中的某天（仅leap年中为365）。

Daylight Saving Time flag. Positive if in force, zero if not, negative if unknown.
夏令时标志。有效时为正，否则为零，未知则为负。

(Optional.) The abbreviation for the time zone in force at that time: "" if unknown (but "" might also be used for UTC).
（可选。）当时有效的时区的缩写：""（如果未知）（但对于UTC也可能使用""）。

(Optional.) The offset in seconds from GMT: positive values are East of the meridian. Usually NA if unknown, but 0 could mean unknown.
（可选。）距GMT的偏移量（以秒为单位）：正值位于子午线以东。如果未知，通常为NAc，但0可能表示未知。

(The last two components are not present for times in UTC and are platform-dependent: they are supported on platforms based on BSD or glibc (including Linux and macOS) and those using the tzcode implementation shipped with R (including Windows). But they are not necessarily set.). Note that the internal list structure is somewhat hidden, as many methods (including length(x), print() and str) apply to the abstract date-time vector, as for "POSIXct". As from R 3.5.0, one can extract and replace single components via [ indexing with two indices (see the examples). The classes correspond to the POSIX/C99 constructs of calendar time (the time_t data type