View source for Template:Daylight savings timezone

{{#switch:{{uc:{{{1|}}}}}

<!--Pacific Time (Northern America)-->
|PT|PST|PDT

<!--Mountain Time (Northern America)-->
|MT|MST|MDT

<!--Central Time (Northern America)-->
|CT|CST|CDT

<!--Eastern Time (Northern America)-->
|ET|EST|EDT=
 {{#ifexpr:
      <!--April through October-->
           ({{#time:n}} > 3  and {{#time:n}} < 11)
      <!--date in March after start DST-->
        or ({{#time:n}} = 3  and {{#time:j}} > {{#expr:(14 - (5*{{#time:Y}}/4 + 1) mod 7)}})
      <!--date in November before end DST-->
        or ({{#time:n}} = 11 and {{#time:j}} < {{#expr:(7  - (5*{{#time:Y}}/4 + 1) mod 7)}})
      <!--day of start DST after 2 AM local standard time (second Sunday in March)-->
        or ({{#time:n}} = 3  and {{#time:j}} = {{#expr:(14 - (5*{{#time:Y}}/4 + 1) mod 7)}} and {{#time:G|{{#switch:{{uc:{{{1}}}}}|NT|NST|NDT=-30|0}} minutes}} >= {{#switch:{{uc:{{{1}}}}}|HAT|HAST|HADT=12|AKT|AKST|AKDT=11|PT|PST|PDT=10|MT|MST|MDT=9|CT|CST|CDT=8|ET|EST|EDT=7|AT|AST|ADT=6|NT|NST|NDT=5}})
      <!--day of end DST before 2 AM local daylight saving time (first Sunday in November)-->
        or ({{#time:n}} = 11 and {{#time:j}} = {{#expr:(7  - (5*{{#time:Y}}/4 + 1) mod 7)}} and {{#time:G|{{#switch:{{uc:{{{1}}}}}|NT|NST|NDT=-30|0}} minutes}} < {{#switch:{{uc:{{{1}}}}}|HAT|HAST|HADT=11|AKT|AKST|AKDT=10|PT|PST|PDT=9|MT|MST|MDT=8|CT|CST|CDT=7|ET|EST|EDT=6|AT|AST|ADT=5|NT|NST|NDT=4}})
  |1 <!--DST active-->
  |0 <!--DST not active-->
 }}

<!--Greenwich Mean Time / British Summer Time (same as WET / WEST)-->
|GMT|BST=
 {{#ifexpr:
      <!--April through September-->
           ({{#time:n}} > 3  and {{#time:n}} < 10)
      <!--date in March after start DST-->
        or ({{#time:n}} = 3  and {{#time:j}} > {{#expr:(31 - (5*{{#time:Y}}/4 + 4) mod 7)}})
      <!--date in October before end DST-->
        or ({{#time:n}} = 10 and {{#time:j}} < {{#expr:(31 - (5*{{#time:Y}}/4 + 1) mod 7)}})
      <!--day of start DST after UTC+1 (last Sunday in March)-->
        or ({{#time:n}} = 3  and {{#time:j}} = {{#expr:(31 - (5*{{#time:Y}}/4 + 4) mod 7)}} and {{#time:G}} >= 1)
      <!--day of end DST before UTC+1 (last Sunday in October)-->
        or ({{#time:n}} = 10 and {{#time:j}} = {{#expr:(31 - (5*{{#time:Y}}/4 + 1) mod 7)}} and {{#time:G}} < 1)
  |1 <!--DST active-->
  |0 <!--DST not active-->
 }}

<!--Japan Standard Time-->
|JST=0 <!--no DST-->

<!--default-->
|0
}}

[[Category:Templates/System]]