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There are two groups of time format specifiers: time/date and relative time. These may be used to generate axis tic labels or to encode time in a string. See set xtics time, strftime, strptime.
The time/date formats are
Date Format | Explanation |
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%a | abbreviated name of day of the week |
%A | full name of day of the week |
%b or %h | abbreviated name of the month |
%B | full name of the month |
%d | day of the month, 01–31 |
%D | shorthand for %m/%d/%y (only output) |
%F | shorthand for %Y-%m-%d (only output) |
%k | hour, 0–23 (one or two digits) |
%H | hour, 00–23 (always two digits) |
%l | hour, 1–12 (one or two digits) |
%I | hour, 01–12 (always two digits) |
%j | day of the year, 1–366 |
%m | month, 01–12 |
%M | minute, 0–60 |
%p | "am" or "pm" |
%r | shorthand for %I:%M:%S %p (only output) |
%R | shorthand for %H:%M (only output) |
%S | second, integer 0–60 on output, (double) on input |
%s | number of seconds since start of year 1970 |
%T | shorthand for %H:%M:%S (only output) |
%U | week of the year (CDC/MMWR "epi week") |
%w | day of the week, 0–6 (Sunday = 0) |
%W | week of the year (ISO 8601 week date) |
%y | year, 0-99 in range 1969-2068 |
%Y | year, 4-digit |
%z | timezone, [+-]hh:mm |
%Z | timezone name, ignored string |
For more information on the %W format (ISO week of year) see tm_week. The %U format (CDC/MMWR epidemiological week) is similar to %W except that it uses weeks that start on Sunday rather than Monday. Caveat: Both the %W and the %U formats were unreliable in gnuplot versions prior to 5.4.2. See unit test "week_date.dem".
The relative time formats express the length of a time interval on either side of a zero time point. The relative time formats are
Time Format | Explanation |
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%tD | +/- days relative to time=0 |
%tH | +/- hours relative to time=0 (does not wrap at 24) |
%tM | +/- minutes relative to time=0 |
%tS | +/- seconds associated with previous tH or tM field |
Numerical formats may be preceded by a "0" ("zero") to pad the field with leading zeroes, and preceded by a positive digit to define the minimum field width. The %S, and %t formats also accept a precision specifier so that fractional hours/minutes/seconds can be written.
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