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39 .Nd format date and time
46 .Fa "char * restrict buf"
48 .Fa "const char * restrict format"
49 .Fa "const struct tm * restrict timeptr"
54 function formats the information from
58 according to the string pointed to by
63 string consists of zero or more conversion specifications and
65 All ordinary characters are copied directly into the buffer.
66 A conversion specification consists of a percent sign
68 and one other character.
72 characters will be placed into the array.
73 If the total number of resulting characters, including the terminating
74 NUL character, is not more than
77 returns the number of characters in the array, not counting the
79 Otherwise, zero is returned and the buffer contents are indeterminate.
81 The conversion specifications are copied to the buffer after expansion
83 .Bl -tag -width "xxxx"
85 is replaced by national representation of the full weekday name.
87 is replaced by national representation of
88 the abbreviated weekday name.
90 is replaced by national representation of the full month name.
92 is replaced by national representation of
93 the abbreviated month name.
95 is replaced by (year / 100) as decimal number; single
96 digits are preceded by a zero.
98 is replaced by national representation of time and date.
103 is replaced by the day of the month as a decimal number (01-31).
104 .It Cm \&%E* Cm \&%O*
105 POSIX locale extensions.
107 %Ec %EC %Ex %EX %Ey %EY
108 %Od %Oe %OH %OI %Om %OM
109 %OS %Ou %OU %OV %Ow %OW %Oy
110 are supposed to provide alternate
113 Additionally %OB implemented
114 to represent alternative months names
115 (used standalone, without day mentioned).
117 is replaced by the day of month as a decimal number (1-31); single
118 digits are preceded by a blank.
120 is replaced by the date in the format
123 is replaced by a year as a decimal number with century.
124 This year is the one that contains the greater part of
125 the week (Monday as the first day of the week).
127 is replaced by the same year as in
129 but as a decimal number without century (00-99).
131 is replaced by the hour (24-hour clock) as a decimal number (00-23).
135 is replaced by the hour (12-hour clock) as a decimal number (01-12).
137 is replaced by the day of the year as a decimal number (001-366).
139 is replaced by the hour (24-hour clock) as a decimal number (0-23);
140 single digits are preceded by a blank.
142 is replaced by the hour (12-hour clock) as a decimal number (1-12);
143 single digits are preceded by a blank.
145 is replaced by the minute as a decimal number (00-59).
147 is replaced by the month as a decimal number (01-12).
149 is replaced by a newline.
153 is replaced by national representation of either
165 is replaced by the second as a decimal number (00-60).
167 is replaced by the number of seconds since the Epoch, UTC (see
173 is replaced by a tab.
175 is replaced by the week number of the year (Sunday as the first day of
176 the week) as a decimal number (00-53).
178 is replaced by the weekday (Monday as the first day of the week)
179 as a decimal number (1-7).
181 is replaced by the week number of the year (Monday as the first day of
182 the week) as a decimal number (01-53). If the week containing January
183 1 has four or more days in the new year, then it is week 1; otherwise
184 it is the last week of the previous year, and the next week is week 1.
189 is replaced by the week number of the year (Monday as the first day of
190 the week) as a decimal number (00-53).
192 is replaced by the weekday (Sunday as the first day of the week)
193 as a decimal number (0-6).
195 is replaced by national representation of the time.
197 is replaced by national representation of the date.
199 is replaced by the year with century as a decimal number.
201 is replaced by the year without century as a decimal number (00-99).
203 is replaced by the time zone name,
204 or by the empty string if this is not determinable.
206 is replaced by the offset from UTC in the format
211 with positive values representing locations east of Greenwich,
212 or by the empty string if this is not determinable.
214 is replaced by national representation of the date and time
215 (the format is similar to that produced by
233 with a lot of extensions including
255 The peculiar week number and year in the replacements of
260 are defined in ISO 8601: 1988.
262 There is no conversion specification for the phase of the moon.