Convert dates encoded as serial numbers to Date class.
Converts numbers like 42370 into date values like
2016-01-01.
Defaults to the modern Excel date encoding system. However, Excel for Mac 2008 and earlier Mac versions of Excel used a different date system. To determine what platform to specify: if the date 2016-01-01 is represented by the number 42370 in your spreadsheet, it's the modern system. If it's 40908, it's the old Mac system. More on date encoding systems at http://support.office.com/en-us/article/Date-calculations-in-Excel-e7fe7167-48a9-4b96-bb53-5612a800b487.
A list of all timezones is available from base::OlsonNames(), and the
current timezone is available from base::Sys.timezone().
If your input data has a mix of Excel numeric dates and actual dates, see the
more powerful functions convert_to_date() and convert_to_datetime().
excel_numeric_to_date( date_num, date_system = "modern", include_time = FALSE, round_seconds = TRUE, tz = "" )
date_num |
numeric vector of serial numbers to convert. |
date_system |
the date system, either |
include_time |
Include the time (hours, minutes, seconds) in the output? (See details) |
round_seconds |
Round the seconds to an integer (only has an effect when
|
tz |
Time zone, used when |
When using include_time=TRUE, days with leap seconds will not
be accurately handled as they do not appear to be accurately handled by
Windows (as described in
https://support.microsoft.com/en-us/help/2722715/support-for-the-leap-second).
Returns a vector of class Date if include_time is
FALSE. Returns a vector of class POSIXlt if include_time is
TRUE.
Other Date-time cleaning:
convert_to_date()
excel_numeric_to_date(40000) excel_numeric_to_date(40000.5) # No time is included excel_numeric_to_date(40000.5, include_time = TRUE) # Time is included excel_numeric_to_date(40000.521, include_time = TRUE) # Time is included excel_numeric_to_date(40000.521, include_time = TRUE, round_seconds = FALSE) # Time with fractional seconds is included
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