timerender: Include year in message interstitials.
timerender: Include year in message interstitials.

For longer running servers, searching the backlog can become ambiguous
since the date stamps that demarcate the messages only include the month
and day. This commit changes the behavior to include the year for
messages which are more than a year old.

Jianchun1/zulip,sonali0901/zulip,Jianchun1/zulip,timabbott/zulip,souravbadami/zulip,brainwane/zulip,andersk/zulip,Juanvulcano/zulip,joyhchen/zulip,KingxBanana/zulip,rht/zulip,jphilipsen05/zulip,ahmadassaf/zulip,eeshangarg/zulip,mahim97/zulip,Diptanshu8/zulip,paxapy/zulip,KingxBanana/zulip,grave-w-grave/zulip,jackrzhang/zulip,kou/zulip,amyliu345/zulip,jackrzhang/zulip,rht/zulip,grave-w-grave/zulip,vaidap/zulip,amyliu345/zulip,jainayush975/zulip,vikas-parashar/zulip,grave-w-grave/zulip,mohsenSy/zulip,isht3/zulip,christi3k/zulip,j831/zulip,arpith/zulip,brainwane/zulip,vabs22/zulip,isht3/zulip,dhcrzf/zulip,sonali0901/zulip,dattatreya303/zulip,verma-varsha/zulip,peguin40/zulip,showell/zulip,zulip/zulip,vikas-parashar/zulip,jphilipsen05/zulip,jainayush975/zulip,AZtheAsian/zulip,souravbadami/zulip,isht3/zulip,jackrzhang/zulip,rishig/zulip,rht/zulip,AZtheAsian/zulip,mahim97/zulip,jphilipsen05/zulip,dattatreya303/zulip,KingxBanana/zulip,krtkmj/zulip,showell/zulip,j831/zulip,jrowan/zulip,punchagan/zulip,timabbott/zulip,timabbott/zulip,christi3k/zulip,vikas-parashar/zulip,AZtheAsian/zulip,calvinleenyc/zulip,AZtheAsian/zulip,hackerkid/zulip,cosmicAsymmetry/zulip,j831/zulip,calvinleenyc/zulip,zacps/zulip,reyha/zulip,grave-w-grave/zulip,jphilipsen05/zulip,tommyip/zulip,vaidap/zulip,synicalsyntax/zulip,Juanvulcano/zulip,reyha/zulip,hackerkid/zulip,kou/zulip,susansls/zulip,KingxBanana/zulip,rishig/zulip,calvinleenyc/zulip,aakash-cr7/zulip,mahim97/zulip,sharmaeklavya2/zulip,calvinleenyc/zulip,umkay/zulip,j831/zulip,tommyip/zulip,jackrzhang/zulip,arpith/zulip,sup95/zulip,Galexrt/zulip,krtkmj/zulip,vaidap/zulip,synicalsyntax/zulip,timabbott/zulip,niftynei/zulip,j831/zulip,zacps/zulip,ryanbackman/zulip,sup95/zulip,ryanbackman/zulip,verma-varsha/zulip,jrowan/zulip,brainwane/zulip,TigorC/zulip,souravbadami/zulip,amanharitsh123/zulip,mohsenSy/zulip,jackrzhang/zulip,rht/zulip,dhcrzf/zulip,zacps/zulip,eeshangarg/zulip,SmartPeople/zulip,dawran6/zulip,shubhamdhama/zulip,sharmaeklavya2/zulip,aakash-cr7/zulip,zulip/zulip,timabbott/zulip,arpith/zulip,rht/zulip,samatdav/zulip,paxapy/zulip,jackrzhang/zulip,Galexrt/zulip,shubhamdhama/zulip,synicalsyntax/zulip,amanharitsh123/zulip,samatdav/zulip,rishig/zulip,Jianchun1/zulip,SmartPeople/zulip,dattatreya303/zulip,dawran6/zulip,sharmaeklavya2/zulip,christi3k/zulip,paxapy/zulip,grave-w-grave/zulip,dhcrzf/zulip,sup95/zulip,brainwane/zulip,showell/zulip,punchagan/zulip,Galexrt/zulip,punchagan/zulip,brockwhittaker/zulip,verma-varsha/zulip,SmartPeople/zulip,dhcrzf/zulip,dawran6/zulip,christi3k/zulip,kou/zulip,niftynei/zulip,showell/zulip,JPJPJPOPOP/zulip,SmartPeople/zulip,andersk/zulip,hackerkid/zulip,shubhamdhama/zulip,joyhchen/zulip,andersk/zulip,reyha/zulip,joyhchen/zulip,punchagan/zulip,JPJPJPOPOP/zulip,sonali0901/zulip,ahmadassaf/zulip,niftynei/zulip,zacps/zulip,PhilSk/zulip,shubhamdhama/zulip,Diptanshu8/zulip,umkay/zulip,mohsenSy/zulip,vaidap/zulip,synicalsyntax/zulip,sharmaeklavya2/zulip,blaze225/zulip,peguin40/zulip,amanharitsh123/zulip,Diptanshu8/zulip,Jianchun1/zulip,cosmicAsymmetry/zulip,brainwane/zulip,arpith/zulip,andersk/zulip,krtkmj/zulip,SmartPeople/zulip,TigorC/zulip,vaidap/zulip,amyliu345/zulip,KingxBanana/zulip,synicalsyntax/zulip,sup95/zulip,mohsenSy/zulip,vikas-parashar/zulip,rishig/zulip,christi3k/zulip,susansls/zulip,Diptanshu8/zulip,sonali0901/zulip,sup95/zulip,amanharitsh123/zulip,grave-w-grave/zulip,punchagan/zulip,cosmicAsymmetry/zulip,KingxBanana/zulip,paxapy/zulip,mohsenSy/zulip,sonali0901/zulip,ryanbackman/zulip,peguin40/zulip,rishig/zulip,ahmadassaf/zulip,reyha/zulip,jrowan/zulip,paxapy/zulip,brockwhittaker/zulip,jainayush975/zulip,vaidap/zulip,vikas-parashar/zulip,hackerkid/zulip,krtkmj/zulip,krtkmj/zulip,TigorC/zulip,calvinleenyc/zulip,verma-varsha/zulip,PhilSk/zulip,PhilSk/zulip,hackerkid/zulip,joyhchen/zulip,reyha/zulip,AZtheAsian/zulip,Galexrt/zulip,kou/zulip,isht3/zulip,timabbott/zulip,isht3/zulip,vabs22/zulip,jrowan/zulip,eeshangarg/zulip,souravbadami/zulip,blaze225/zulip,susansls/zulip,souravbadami/zulip,brockwhittaker/zulip,samatdav/zulip,andersk/zulip,dawran6/zulip,jphilipsen05/zulip,mohsenSy/zulip,aakash-cr7/zulip,umkay/zulip,paxapy/zulip,susansls/zulip,sonali0901/zulip,calvinleenyc/zulip,peguin40/zulip,dattatreya303/zulip,synicalsyntax/zulip,susansls/zulip,ahmadassaf/zulip,AZtheAsian/zulip,shubhamdhama/zulip,amyliu345/zulip,dhcrzf/zulip,joyhchen/zulip,zulip/zulip,punchagan/zulip,umkay/zulip,zulip/zulip,hackerkid/zulip,timabbott/zulip,Galexrt/zulip,shubhamdhama/zulip,vikas-parashar/zulip,rishig/zulip,cosmicAsymmetry/zulip,dattatreya303/zulip,punchagan/zulip,hackerkid/zulip,vabs22/zulip,JPJPJPOPOP/zulip,ahmadassaf/zulip,JPJPJPOPOP/zulip,zulip/zulip,zulip/zulip,souravbadami/zulip,aakash-cr7/zulip,Juanvulcano/zulip,PhilSk/zulip,samatdav/zulip,amyliu345/zulip,kou/zulip,showell/zulip,Galexrt/zulip,zulip/zulip,j831/zulip,dhcrzf/zulip,tommyip/zulip,isht3/zulip,rht/zulip,aakash-cr7/zulip,christi3k/zulip,joyhchen/zulip,aakash-cr7/zulip,zacps/zulip,amyliu345/zulip,reyha/zulip,eeshangarg/zulip,jphilipsen05/zulip,SmartPeople/zulip,umkay/zulip,mahim97/zulip,tommyip/zulip,amanharitsh123/zulip,vabs22/zulip,ryanbackman/zulip,JPJPJPOPOP/zulip,blaze225/zulip,showell/zulip,peguin40/zulip,krtkmj/zulip,blaze225/zulip,jackrzhang/zulip,umkay/zulip,amanharitsh123/zulip,jrowan/zulip,niftynei/zulip,arpith/zulip,brockwhittaker/zulip,umkay/zulip,brockwhittaker/zulip,mahim97/zulip,dattatreya303/zulip,shubhamdhama/zulip,dhcrzf/zulip,ryanbackman/zulip,vabs22/zulip,synicalsyntax/zulip,brockwhittaker/zulip,eeshangarg/zulip,jrowan/zulip,Galexrt/zulip,andersk/zulip,susansls/zulip,dawran6/zulip,verma-varsha/zulip,brainwane/zulip,zacps/zulip,kou/zulip,brainwane/zulip,ryanbackman/zulip,mahim97/zulip,jainayush975/zulip,vabs22/zulip,eeshangarg/zulip,TigorC/zulip,PhilSk/zulip,andersk/zulip,sharmaeklavya2/zulip,dawran6/zulip,niftynei/zulip,cosmicAsymmetry/zulip,jainayush975/zulip,sup95/zulip,ahmadassaf/zulip,niftynei/zulip,arpith/zulip,PhilSk/zulip,tommyip/zulip,kou/zulip,showell/zulip,Diptanshu8/zulip,sharmaeklavya2/zulip,jainayush975/zulip,eeshangarg/zulip,samatdav/zulip,cosmicAsymmetry/zulip,TigorC/zulip,Diptanshu8/zulip,krtkmj/zulip,Juanvulcano/zulip,rishig/zulip,Jianchun1/zulip,Jianchun1/zulip,samatdav/zulip,ahmadassaf/zulip,peguin40/zulip,rht/zulip,TigorC/zulip,blaze225/zulip,tommyip/zulip,Juanvulcano/zulip,JPJPJPOPOP/zulip,verma-varsha/zulip,blaze225/zulip,tommyip/zulip,Juanvulcano/zulip