Remove uses of external `date`

codearchiver-bot

@@ -153,7 +153,7 @@ function taint_block {
 			sleep 1
 		done
 		trap 'rmdir ".loglock"' EXIT  # Unlock if something below fails
-		logbasename="$(date +%Y%m%dT%H%M%SZ)_${singlejobid}"
+		logbasename="$(printf '%(%Y%m%dT%H%M%SZ)T')_${singlejobid}"
 		if [[ -e "${logbasename}_codearchiver.log" || -e "${logbasename}_codearchiver.log.zst" ]]; then
 			for ((j=0; ; ++j)); do
 				if [[ ! -e "${logbasename}_coll${j}_codearchiver.log" || -e "${logbasename}_coll${j}_codearchiver.log.zst" ]]; then
@@ -247,7 +247,7 @@ function taint_block {
 		taint_block 'uploading anything'
 
 		# Upload
-		date="$(date '+%Y-%m-%d')"
+		date="$(printf '%(%Y-%m-%d)T')"
 		identifier="codearchiver_${date//-/}"
 		if [[ -z "${CODEARCHIVER_BOT_TEST}" ]]; then
 			collection='archiveteam_codearchiver'