These functions convert a given date/time object to a character vector, or conversely.
stri_datetime_format(time, format = "uuuu-MM-dd HH:mm:ss", tz = NULL,
locale = NULL)stri_datetime_parse(str, format = "uuuu-MM-dd HH:mm:ss",
lenient = FALSE, tz = NULL, locale = NULL)
an object of class POSIXct or an object coercible to
single string, see Details; see also stri_datetime_fstr
NULL or "" for the default time zone
or a single string with a timezone identifier,
see stri_timezone_list
NULL or "" for default locale,
or a single string with locale identifier; a non-Gregorian calendar
may be specified by setting the @calendar=name keyword
character vector
single logical value; should date/time parsing be lenient?
Further arguments to be passed from or to other methods.
stri_datetime_format returns a character vector.
stri_datetime_parse returns an object of class POSIXct.
Vectorized over time or str.
By default, stri_datetime_format (for the sake of compatibility
with the strftime function, but unlike format.POSIXst)
formats a date/time object using the current default time zone.
format may be one of DT_STYLE or DT_relative_STYLE,
where DT is equal to date, time, or datetime,
and STYLE is equal to full, long, medium,
or short. This gives a locale-dependent date and/or time format.
Note that currently ICU does not support relative time formats,
so this flag is currently ignored in such a context.
Otherwise, format is a pattern:
a string, where specific sequences of characters are replaced
with date and time data from a calendar when formatting or used
to generate data for a calendar when parsing.
For example, y stands for the year. Characters
may be used multiple times:
yy might produce 99, whereas yyyy yields 1999.
For most of the numerical fields, the number of characters specifies
the field width. For example, if h is the hour, h might
produce 5, but hh yields 05.
For some characters, the count specifies whether an abbreviated
or full form should be used, but may have other choices, as given below.
Two single quotes represent a literal single quote, either
inside or outside single quotes. Text within single quotes
is not interpreted in any way (except for two adjacent single quotes).
Otherwise all ASCII letter from a to z and A to Z
are reserved as syntax characters, and require quoting if
they are to represent literal characters. In addition, certain
ASCII punctuation characters may become variable in the future
(e.g., : being interpreted as the time separator and /
as a date separator, and replaced by respective
locale-sensitive characters in display).
| Symbol | Meaning | Example(s) | Output |
| G | era designator | G, GG, or GGG | AD |
| GGGG | Anno Domini | ||
| GGGGG | A | ||
| y | year | yy | 96 |
| y or yyyy | 1996 | ||
| u | extended year | u | 4601 |
| U | cyclic year name, as in Chinese lunar calendar | U | |
| r | related Gregorian year | r | 1996 |
| Q | quarter | Q or QQ | 02 |
| QQQ | Q2 | ||
| QQQQ | 2nd quarter | ||
| QQQQQ | 2 | ||
| q | Stand Alone quarter | q or qq | 02 |
| qqq | Q2 | ||
| qqqq | 2nd quarter | ||
| qqqqq | 2 | ||
| M | month in year | M or MM | 09 |
| MMM | Sep | ||
| MMMM | September | ||
| MMMMM | S | ||
| L | Stand Alone month in year | L or LL | 09 |
| LLL | Sep | ||
| LLLL | September | ||
| LLLLL | S | ||
| w | week of year | w or ww | 27 |
| W | week of month | W | 2 |
| d | day in month | d | 2 |
| dd | 02 | ||
| D | day of year | D | 189 |
| F | day of week in month | F | 2 (2nd Wed in July) |
| g | modified Julian day | g | 2451334 |
| E | day of week | E, EE, or EEE | Tue |
| EEEE | Tuesday | ||
| EEEEE | T | ||
| EEEEEE | Tu | ||
| e | local day of week | e or ee | 2 |
| example: if Monday is 1st day, Tuesday is 2nd ) | eee | Tue | |
| eeee | Tuesday | ||
| eeeee | T | ||
| eeeeee | Tu | ||
| c | Stand Alone local day of week | c or cc | 2 |
| ccc | Tue | ||
| cccc | Tuesday | ||
| ccccc | T | ||
| cccccc | Tu | ||
| a | am/pm marker | a | pm |
| h | hour in am/pm (1~12) | h | 7 |
| hh | 07 | ||
| H | hour in day (0~23) | H | 0 |
| HH | 00 | ||
| k | hour in day (1~24) | k | 24 |
| kk | 24 | ||
| K | hour in am/pm (0~11) | K | 0 |
| KK | 00 | ||
| m | minute in hour | m | 4 |
| mm | 04 | ||
| s | second in minute | s | 5 |
| ss | 05 | ||
| S | fractional second - truncates (like other time fields) | S | 2 |
| to the count of letters when formatting. Appends | SS | 23 | |
| zeros if more than 3 letters specified. Truncates at | SSS | 235 | |
| three significant digits when parsing. | SSSS | 2350 | |
| A | milliseconds in day | A | 61201235 |
| z | Time Zone: specific non-location | z, zz, or zzz | PDT |
| zzzz | Pacific Daylight Time | ||
| Z | Time Zone: ISO8601 basic hms? / RFC 822 | Z, ZZ, or ZZZ | -0800 |
| Time Zone: long localized GMT (=OOOO) | ZZZZ | GMT-08:00 | |
| Time Zone: ISO8601 extended hms? (=XXXXX) | ZZZZZ | -08:00, -07:52:58, Z | |
| O | Time Zone: short localized GMT | O | GMT-8 |
| Time Zone: long localized GMT (=ZZZZ) | OOOO | GMT-08:00 | |
| v | Time Zone: generic non-location | v | PT |
| (falls back first to VVVV) | vvvv | Pacific Time or Los Angeles Time | |
| V | Time Zone: short time zone ID | V | uslax |
| Time Zone: long time zone ID | VV | America/Los_Angeles | |
| Time Zone: time zone exemplar city | VVV | Los Angeles | |
| Time Zone: generic location (falls back to OOOO) | VVVV | Los Angeles Time | |
| X | Time Zone: ISO8601 basic hm?, with Z for 0 | X | -08, +0530, Z |
| Time Zone: ISO8601 basic hm, with Z | XX | -0800, Z | |
| Time Zone: ISO8601 extended hm, with Z | XXX | -08:00, Z | |
| Time Zone: ISO8601 basic hms?, with Z | XXXX | -0800, -075258, Z | |
| Time Zone: ISO8601 extended hms?, with Z | XXXXX | -08:00, -07:52:58, Z | |
| x | Time Zone: ISO8601 basic hm?, without Z for 0 | x | -08, +0530 |
| Time Zone: ISO8601 basic hm, without Z | xx | -0800 | |
| Time Zone: ISO8601 extended hm, without Z | xxx | -08:00 | |
| Time Zone: ISO8601 basic hms?, without Z | xxxx | -0800, -075258 | |
| Time Zone: ISO8601 extended hms?, without Z | xxxxx | -08:00, -07:52:58 | |
| ' | escape for text | ' | (nothing) |
Note that any characters in the pattern that are not in the ranges
of [a-z] and [A-Z] will be treated as quoted text.
For instance, characters like :, ., (a space),
# and @ will appear in the resulting time text
even if they are not enclosed within single quotes. The single quote is used
to ``escape'' letters. Two single quotes in a row,
inside or outside a quoted sequence, represent a ``real'' single quote.
Here are some examples:
| Exemplary Pattern | Result |
| yyyy.MM.dd 'at' HH:mm:ss zzz | 2015.12.31 at 23:59:59 GMT+1 |
| EEE, MMM d, ''yy | czw., gru 31, '15 |
| h:mm a | 11:59 PM |
| hh 'o''clock' a, zzzz | 11 o'clock PM, GMT+01:00 |
| K:mm a, z | 11:59 PM, GMT+1 |
| yyyyy.MMMM.dd GGG hh:mm aaa | 2015.grudnia.31 n.e. 11:59 PM |
| uuuu-MM-dd'T'HH:mm:ssZ | 2015-12-31T23:59:59+0100 (the ISO 8601 guideline) |
Formatting Dates and Times - ICU User Guide, http://userguide.icu-project.org/formatparse/datetime
Other datetime: stri_datetime_add,
stri_datetime_create,
stri_datetime_fields,
stri_datetime_fstr,
stri_datetime_now,
stri_datetime_symbols,
stri_timezone_get,
stri_timezone_info,
stri_timezone_list
# NOT RUN {
stri_datetime_parse(c("2015-02-28", "2015-02-29"), "yyyy-MM-dd")
stri_datetime_parse(c("2015-02-28", "2015-02-29"), "yyyy-MM-dd", lenient=TRUE)
stri_datetime_parse("19 lipca 2015", "date_long", locale="pl_PL")
stri_datetime_format(stri_datetime_now(), "datetime_relative_medium")
# }
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