:Template:MONTHNUMBER

{{safesubst:#if:{{{1|}}}

|{{safesubst:#switch:{{safesubst:lc:{{{1}}}}}

|january|jan=1

|february|feb=2

|march|mar=3

|apr|april=4

|may=5

|june|jun=6

|july|jul=7

|august|aug=8

|september|sep|sept=9

|october|oct=10

|november|nov=11

|december|dec=12

|{{safesubst:#ifexpr:{{{1}}}<0

|{{safesubst:#ifexpr:(({{{1}}})round 0)!=({{{1}}})

|{{safesubst:#expr:12-(((0.5-({{{1}}}))round 0)mod 12)}}

|{{safesubst:#expr:12-(((11.5-({{{1}}}))round 0)mod 12)}}

}}

|{{safesubst:#expr:(((10.5+{{{1}}})round 0)mod 12)+1}}

}}

}}

|Missing required parameter 1=month!

}}

{{Documentation}}