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36 .Nd change file access and modification times
39 .Op Fl A Ar [-][[hh]mm]SS
42 .Op Fl t Ar [[CC]YY]MMDDhhmm[.SS]
43 .Op Fl d Ar YYYY-MM-DDThh:mm:SS[.frac][tz]
48 utility sets the modification and access times of files.
49 If any file does not exist, it is created with default permissions.
53 changes both modification and access times.
58 flags may be used to select the access time or the modification time
60 Selecting both is equivalent to the default.
61 By default, the timestamps are set to the current time.
66 flags explicitly specify a different time, and the
68 flag specifies to set the times those of the specified file.
71 flag adjusts the values by a specified amount.
73 The following options are available:
76 Adjust the access and modification time stamps for the file by the
78 This flag is intended for use in modifying files with incorrectly set
81 The argument is of the form
83 where each pair of letters represents the following:
85 .Bl -tag -width Ds -compact -offset indent
87 Make the adjustment negative: the new time stamp is set to be before
90 The number of hours, from 00 to 99.
92 The number of minutes, from 00 to 59.
94 The number of seconds, from 00 to 59.
101 flag: if any file specified does not exist, it will be silently ignored.
103 Change the access time of the file.
104 The modification time of the file is not changed unless the
106 flag is also specified.
108 Do not create the file if it does not exist.
111 utility does not treat this as an error.
112 No error messages are displayed and the exit value is not affected.
114 Change the access and modification times to the specified date time instead
115 of the current time of day.
116 The argument is of the form
117 .Dq YYYY-MM-DDThh:mm:SS[.frac][tz]
118 where the letters represent the following:
119 .Bl -tag -width Ds -compact -offset indent
121 At least four decimal digits representing the year.
122 .It Ar MM , Ar DD , Ar hh , Ar mm , Ar SS
129 or a space is the time designator.
131 An optional fraction, consisting of a period or a comma followed by one or
133 The number of significant digits depends on the kernel configuration and the
134 filesystem, and may be zero.
138 indicating the time is in
140 Otherwise, the time is assumed to be in local time.
141 Local time is affected by the value of the
143 environment variable.
146 If the file is a symbolic link, change the times of the link
147 itself rather than the file that the link points to.
152 and thus will not create any new files.
154 Change the modification time of the file.
155 The access time of the file is not changed unless the
157 flag is also specified.
159 Use the access and modifications times from the specified file
160 instead of the current time of day.
162 Change the access and modification times to the specified time instead
163 of the current time of day.
164 The argument is of the form
165 .Dq [[CC]YY]MMDDhhmm[.SS]
166 where each pair of letters represents the following:
168 .Bl -tag -width Ds -compact -offset indent
170 The first two digits of the year (the century).
172 The second two digits of the year.
179 between 69 and 99 results in a
186 The month of the year, from 01 to 12.
188 the day of the month, from 01 to 31.
190 The hour of the day, from 00 to 23.
192 The minute of the hour, from 00 to 59.
194 The second of the minute, from 00 to 60.
201 letter pairs are not specified, the values default to the current
205 letter pair is not specified, the value defaults to 0.
210 The obsolescent form of
212 where a time format is specified as the first argument, is supported.
217 option is specified, there are at least two arguments, and the first
218 argument is a string of digits either eight or ten characters in length,
219 the first argument is interpreted as a time specification of the form
228 letter pairs are treated as their counterparts specified to the
233 letter pair is in the range 39 to 99, the year is set to 1939 to 1999,
234 otherwise, the year is set in the 21st century.
240 utility is expected to be a superset of the