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Date and time (including IANA Time Zone Database)

Overview

Path Description
steady/ Steady (monotonic) time Readme
wall/ Wall time Readme
zone/ Time zone classes and IANA database Readme
core.hh Core constants, functions and structures Example/Tests
duration.formatter.hh Duration formatter Example/Tests
duration.hh Duration Example/Tests
error.hh Error (enum etc)
limit.hh Limit Example/Tests
parse.hh Parse functions Example/Tests
point.hh Time point and now() function Example/Tests
stopwatch.hh Stopwatch Example/Tests
unit.fwd.hh Unit (forward declare), aliases and concepts
unit.hh Unit Example/Tests

Time point

Format syntax

Character(s)    Description

aa              Ante meridiem (am) or post meridiem (pm), abbreviated, lower case.
                "am" or "pm".
AA              Ante meridiem (AM) or post meridiem (PM), abbreviated, upper case.
                "AM" or "PM".
b
c               ISO 8601/RFC 3339 (without fraction).
                "2001-02-03T04:05:06+07:00"
d               Day of the month.
                "1" to "31".
dd              Day of the month, zero padded.
                "01" to "31".
DD              Day of the month, space padded.
                " 1" to "31".
e               Day of the week (single digit)
                "0" (Sunday) to "6" (Saturday).
eee             Day of the week (abbreviated name).
                "Sun" (Sunday) to "Sat" (Saturday).
f               Full date.
                "2001-02-03"
g               Hour (12-hour clock).
                "1" to "12".
gg              Hour (12-hour clock), zero padded.
                "01" to "12".
h               Hour (24-hour clock).
                "0" to "23".
hh              Hour (24-hour clock), zero padded.
                "00" to "23".
i               Minute
                "0" to "59".
ii              Minute, zero padded.
                "00" to "59".
j
k
l               RFC 1123 (time zone abbreviation is always "GMT").
                "Sat, 03 Feb 2001 04:05:06 GMT"
m               Month
                "1" to "12".
mm              Month, zero padded.
                "01" to "12".
mmm             Month (abbreviated name).
                "Jan" to "Dec".
n               Nanosecond fraction, 1-digit, fixed. (Tenths of a second.)
nn              Nanosecond fraction, 2-digit, fixed. (Hundredths of a second.)
nnn...
nnnnnnnnn       Nanosecond fraction, 9-digit, fixed.
N               Nanosecond fraction, 1-digit, trimmed. (Tenths of a second.)
NN              Nanosecond fraction, 2-digit, trimmed. (Hundredths of a second.)
NNN...
NNNNNNNNN       Nanosecond fraction, 9-digit, trimmed.
o               Time offset in seconds.
                "0", "3600", "-28800" etc.
oooo            Time offset in zero padded +/-hours-minutes.
                "+0700"
ooooo           Time offset in zero padded +/-hours-colon-minutes.
                "+07:00"
OOO             Time zone abbreviation.
                "GMT", "CEST" etc.
p
q               Quick/readable with optional fraction.
                "2001-02-03 04:05:06 +0700" or "2001-02-03 04:05:06.809 +0700".
r               RFC 2822
                "Sat, 03 Feb 2001 04:05:06 +0700"
s               Second
                "0" to "59".
ss              Second, zero padded.
                "00" to "59".
t               Full 24-hour time.
                "15:30:40"
u
v               Is daylight saving time.
                "0" or "1".
w
x
yyyy            Year, 4-digit (minimum), zero padded.
z               ISO 8601/RFC 3339 with 'Z' timezone (without fraction).
.               Is only special if followed by an optional fraction N, in which case it will be
                removed if the fraction is zero.

Reserved format syntax

  • Uppercase versions of gg, hh, ii, mm, ss etc. are reserved for space padding.
  • w is reserved for week number.