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1.1 root 1:
2:
3: TIMEZONE Environmental Variable TIMEZONE
4:
5:
6:
7:
8: Time zone information
9:
10: TTIIMMEEZZOONNEE=_s_t_a_n_d_a_r_d:_o_f_f_s_e_t[:_d_a_y_l_i_g_h_t: _d_a_t_e:_d_a_t_e:_h_o_u_r:_m_i_n_u_t_e_s]
11:
12: TIMEZONE is an environmental parameter that holds information
13: about the user's time zone. This information is used by
14: COHERENT's time routines to construct their description of the
15: current time and day.
16:
17: To set the TIMEZONE parameter, use the sseett command, as follows:
18:
19:
20: set TIMEZONE=[description]
21:
22:
23: where [description] is the string that describes your time zone.
24: What this string consists of will be described below. Most users
25: write this command into the file .pprrooffiillee, so that TIMEZONE is
26: set automatically whenever they log onto the COHERENT system.
27:
28: ***** The Description String *****
29:
30: A TTIIMMEEZZOONNEE description string consists of seven fields that are
31: separated by colons. Fields 1 and 2 must be filled; fields 3
32: through 7 are optional.
33:
34: Field 1 gives the name of your standard time zone. Field 2 gives
35: the time zone's offset from Greenwich Mean Time in minutes.
36: Offsets are positive for time zones west of Greenwich and nega-
37: tive for time zones east of Greenwich. For example, users in
38: Chicago set these fields as follows:
39:
40:
41: TIMEZONE=CST:360
42:
43:
44: CCSSTT is an abbreviation for Central Standard Time, that area's
45: time zone; and 360 refers to the fact that Chicago's time zone is
46: 360 minutes (six hours) behind that of Greenwich.
47:
48: Field 3 gives the name of the local daylight saving time zone.
49: In Chicago, for example, this field would be set as follows:
50:
51:
52: TIMEZONE=CST:360:CDT
53:
54:
55: CDT is an abbreviation for Central Daylight Time. The absence of
56: this field indicates that your area does not use daylight saving
57: time.
58:
59: Fields 4 and 5 specify the dates on which daylight saving time
60: begins and ends. If field 3 is set but fields 4 and 5 are not,
61: changes between standard time and daylight saving time are as-
62:
63:
64: COHERENT Lexicon Page 1
65:
66:
67:
68:
69: TIMEZONE Environmental Variable TIMEZONE
70:
71:
72:
73: sumed to occur at the times legislated in the United States: at 2
74: A.M. standard time on the first Sunday in April, and at 2 A.M.
75: daylight saving time on the last Sunday in October.
76:
77: Fields 4 and 5 each consist of three numbers separated by
78: periods. The first number specifies which occurrence of the day
79: in the month marks the change, counting positive occurrences from
80: the beginning of the month and negative occurrences from the the
81: end of the month. The second number specifies a day of the week,
82: numbering Sunday as one. The third number specifies a month of
83: the year, numbering January as one. For example, in Chicago
84: fields 4 and 5 are set to the following:
85:
86:
87: TIMEZONE=CST:360:CDT:1.1.4:-1.1.10
88:
89:
90: If the first number in either field is set to zero, then the last
91: two numbers are assumed to indicate an absolute date. This is
92: done because some countries switch to daylight saving time on the
93: same day each year, instead of a given day of the week.
94:
95: Finally, fields 6 and 7 specify the hour of the day at which
96: daylight saving time begins and ends, and the number of minutes
97: of adjustment. In Chicago, these are set as follows:
98:
99:
100: TIMEZONE=CST:360:CDT:1.1.4:-1.1.10:2:60
101:
102:
103: The `2' of field 6 indicates that the switch to daylight savings
104: time occurs at 2 A.M. The ``60'' of field 7 indicates that
105: daylight savings time changes the local time by 60 minutes.
106: Although 60 minutes is the standard change, some regions of the
107: world shift by 30, 45, 90, or 120 minutes; the last shift is also
108: called ``double daylight saving time''.
109:
110: For an example of this variable's use in a program, see the entry
111: for asctime.
112:
113: ***** See Also *****
114:
115: environmental variables, setenv, time (overview)
116:
117: For those requiring more information on this subject, much
118: research has been performed by astrologers. See _T_i_m_e _C_h_a_n_g_e_s _i_n
119: _t_h_e _W_o_r_l_d, compiled by Doris Chase Doane (three volumes,
120: Hollywood, California, Professional Astrologers, Inc., 1970).
121:
122:
123:
124:
125:
126:
127:
128:
129:
130: COHERENT Lexicon Page 2
131:
132:
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