Sentinel 1 S3 inventory files timezone change

Hi Sentinel folks, I noticed on the 14th of December the timezone associated with the Sentinel 1 inventory files changed from 08T to 04T. For example:

2018-12-10 17:29:23    8.8 KiB sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-10T08-00Z/manifest.json
2018-12-11 17:28:39   33 Bytes sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-11T08-00Z/manifest.checksum
2018-12-11 17:28:39    8.6 KiB sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-11T08-00Z/manifest.json
2018-12-12 17:46:16   33 Bytes sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-12T08-00Z/manifest.checksum
2018-12-12 17:46:16    8.8 KiB sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-12T08-00Z/manifest.json
2018-12-13 17:28:55   33 Bytes sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-13T08-00Z/manifest.checksum
2018-12-13 17:28:55    8.8 KiB sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-13T08-00Z/manifest.json
2018-12-14 17:28:59   33 Bytes sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-14T04-00Z/manifest.checksum
2018-12-14 17:28:59    8.8 KiB sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-14T04-00Z/manifest.json
2018-12-15 17:26:35   33 Bytes sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-15T04-00Z/manifest.checksum
2018-12-15 17:26:35    8.8 KiB sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-15T04-00Z/manifest.json
2018-12-16 17:23:59   33 Bytes sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-16T04-00Z/manifest.checksum
2018-12-16 17:23:59    9.0 KiB sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-16T04-00Z/manifest.json
2018-12-17 17:23:27   33 Bytes sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-17T04-00Z/manifest.checksum
2018-12-17 17:23:27    9.0 KiB sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-17T04-00Z/manifest.json
2018-12-18 17:27:20   33 Bytes sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-18T04-00Z/manifest.checksum
2018-12-18 17:27:20    9.2 KiB sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-18T04-00Z/manifest.json
2018-12-19 17:23:15   33 Bytes sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-19T04-00Z/manifest.checksum
2018-12-19 17:23:15    9.0 KiB sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-19T04-00Z/manifest.json
2018-12-20 17:22:47   33 Bytes sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-20T04-00Z/manifest.checksum
2018-12-20 17:22:47    9.0 KiB sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-20T04-00Z/manifest.json
2018-12-21 17:19:25   33 Bytes sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-21T04-00Z/manifest.checksum
2018-12-21 17:19:25    9.0 KiB sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-21T04-00Z/manifest.json
2018-12-22 17:17:48   33 Bytes sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-22T04-00Z/manifest.checksum
2018-12-22 17:17:48    9.0 KiB sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-22T04-00Z/manifest.json
2018-12-23 15:57:54   33 Bytes sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-23T04-00Z/manifest.checksum
2018-12-23 15:57:54    9.0 KiB sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-23T04-00Z/manifest.json
2018-12-24 15:57:49   33 Bytes sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-24T04-00Z/manifest.checksum
2018-12-24 15:57:49    9.0 KiB sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-24T04-00Z/manifest.json
2018-12-25 16:01:42   33 Bytes sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-25T04-00Z/manifest.checksum
2018-12-25 16:01:42    9.0 KiB sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-25T04-00Z/manifest.json
2018-12-26 15:57:37   33 Bytes sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-26T04-00Z/manifest.checksum
2018-12-26 15:57:37    9.0 KiB sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-26T04-00Z/manifest.json
2018-12-27 15:55:04   33 Bytes sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-27T04-00Z/manifest.checksum
2018-12-27 15:55:04    9.0 KiB sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-27T04-00Z/manifest.json
2018-12-28 15:54:40   33 Bytes sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-28T04-00Z/manifest.checksum
2018-12-28 15:54:40    9.0 KiB sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-28T04-00Z/manifest.json
2018-12-29 15:53:11   33 Bytes sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-29T04-00Z/manifest.checksum
2018-12-29 15:53:11    9.2 KiB sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-29T04-00Z/manifest.json
2018-12-30 15:53:06   33 Bytes sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-30T04-00Z/manifest.checksum
2018-12-30 15:53:06    9.2 KiB sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-30T04-00Z/manifest.json
2018-12-31 15:52:16   33 Bytes sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-31T04-00Z/manifest.checksum
2018-12-31 15:52:16    9.2 KiB sentinel-s1-l1c/sentinel-s1-l1c-inventory/2018-12-31T04-00Z/manifest.json

Any reason why this changed?